diff --git a/crates/stackable-operator/src/crd/git_sync/mod.rs b/crates/stackable-operator/src/crd/git_sync/mod.rs
index ba3c7d794..c6ce91022 100644
--- a/crates/stackable-operator/src/crd/git_sync/mod.rs
+++ b/crates/stackable-operator/src/crd/git_sync/mod.rs
@@ -68,7 +68,7 @@ pub mod versioned {
         // FIXME: The roundtrip looses data when private keys are used.
         // See https://github.com/stackabletech/issues/issues/849 for details.
         #[versioned(changed(
-            since = "v1alpha2",
+            in = "v1alpha2",
             previous_name = "credentials_secret",
             previous_type = "Option<String>",
             upgrade_with = credentials_secret_to_basic_auth,
diff --git a/crates/stackable-versioned-macros/src/attrs/item/mod.rs b/crates/stackable-versioned-macros/src/attrs/item/mod.rs
index ccbf4500b..f33fc07e1 100644
--- a/crates/stackable-versioned-macros/src/attrs/item/mod.rs
+++ b/crates/stackable-versioned-macros/src/attrs/item/mod.rs
@@ -67,27 +67,27 @@ impl CommonItemAttributes {
         let mut errors = Error::accumulator();
 
         if let Some(added) = &self.added
-            && !versions.iter().any(|v| v.inner == *added.since)
+            && !versions.iter().any(|v| v.inner == *added.version)
         {
             errors.push(Error::custom(
                     "the `added` action uses a version which is not declared via `#[versioned(version)]`",
-                ).with_span(&added.since.span()));
+                ).with_span(&added.version.span()));
         }
 
         for change in &self.changes {
-            if !versions.iter().any(|v| v.inner == *change.since) {
+            if !versions.iter().any(|v| v.inner == *change.version) {
                 errors.push(Error::custom(
                     "the `changed` action uses a version which is not declared via `#[versioned(version)]`"
-                ).with_span(&change.since.span()));
+                ).with_span(&change.version.span()));
             }
         }
 
         if let Some(deprecated) = &self.deprecated
-            && !versions.iter().any(|v| v.inner == *deprecated.since)
+            && !versions.iter().any(|v| v.inner == *deprecated.version)
         {
             errors.push(Error::custom(
                     "the `deprecated` action uses a version which is not declared via `#[versioned(version)]`",
-                ).with_span(&deprecated.since.span()));
+                ).with_span(&deprecated.version.span()));
         }
 
         errors.finish()
@@ -108,16 +108,18 @@ impl CommonItemAttributes {
     ///   rules from above apply here as well.
     fn validate_action_combinations(&self, item_idents: &impl ItemIdents) -> Result<()> {
         match (&self.added, &self.changes, &self.deprecated) {
-            (Some(added), _, Some(deprecated)) if *added.since == *deprecated.since => Err(
+            (Some(added), _, Some(deprecated)) if *added.version == *deprecated.version => Err(
                 Error::custom("cannot be marked as `added` and `deprecated` in the same version")
                     .with_span(item_idents.original()),
             ),
-            (Some(added), changed, _) if changed.iter().any(|r| *r.since == *added.since) => Err(
-                Error::custom("cannot be marked as `added` and `changed` in the same version")
-                    .with_span(item_idents.original()),
-            ),
+            (Some(added), changed, _) if changed.iter().any(|r| *r.version == *added.version) => {
+                Err(
+                    Error::custom("cannot be marked as `added` and `changed` in the same version")
+                        .with_span(item_idents.original()),
+                )
+            }
             (_, changed, Some(deprecated))
-                if changed.iter().any(|r| *r.since == *deprecated.since) =>
+                if changed.iter().any(|r| *r.version == *deprecated.version) =>
             {
                 Err(Error::custom(
                     "cannot be marked as `deprecated` and `changed` in the same version",
@@ -141,8 +143,8 @@ impl CommonItemAttributes {
     /// - All `changed` actions must use a greater version than `added` but a
     ///   lesser version than `deprecated`.
     fn validate_action_order(&self, item_idents: &impl ItemIdents) -> Result<()> {
-        let added_version = self.added.as_ref().map(|a| *a.since);
-        let deprecated_version = self.deprecated.as_ref().map(|d| *d.since);
+        let added_version = self.added.as_ref().map(|a| *a.version);
+        let deprecated_version = self.deprecated.as_ref().map(|d| *d.version);
 
         // First, validate that the added version is less than the deprecated
         // version.
@@ -158,8 +160,8 @@ impl CommonItemAttributes {
         // Now, iterate over all changes and ensure that their versions are
         // between the added and deprecated version.
         if !self.changes.iter().all(|r| {
-            added_version.is_none_or(|a| a < *r.since)
-                && deprecated_version.is_none_or(|d| d > *r.since)
+            added_version.is_none_or(|a| a < *r.version)
+                && deprecated_version.is_none_or(|d| d > *r.version)
         }) {
             return Err(Error::custom(
                 "all changes must use versions higher than `added` and lower than `deprecated`",
@@ -229,7 +231,7 @@ impl CommonItemAttributes {
             {
                 errors.push(Error::custom(
                     "`previous_name`, `previous_type` and `previous_docs` are unset. Is this `changed()` action needed?"
-                ).with_span(&change.since.span()));
+                ).with_span(&change.version.span()));
             }
 
             // This ensures that `previous_name` doesn't include the deprecation prefix.
@@ -306,7 +308,7 @@ impl CommonItemAttributes {
             .iter()
             .filter_map(|change| {
                 let docs = change.previous_docs.as_deref()?;
-                Some((*change.since, docs.into_doc_comments()))
+                Some((*change.version, docs.into_doc_comments()))
             })
             .collect()
     }
@@ -330,7 +332,7 @@ impl CommonItemAttributes {
             let mut actions = BTreeMap::new();
 
             actions.insert(
-                *deprecated.since,
+                *deprecated.version,
                 ItemStatus::Deprecation {
                     previous_ident: ident.clone(),
                     ident: deprecated_ident.clone(),
@@ -353,7 +355,7 @@ impl CommonItemAttributes {
                     .map_or_else(|| ty.clone(), |sv| sv.deref().clone());
 
                 actions.insert(
-                    *change.since,
+                    *change.version,
                     ItemStatus::Change {
                         downgrade_with: change.downgrade_with.as_deref().cloned(),
                         upgrade_with: change.upgrade_with.as_deref().cloned(),
@@ -372,7 +374,7 @@ impl CommonItemAttributes {
             // added action if there is any.
             if let Some(added) = self.added {
                 actions.insert(
-                    *added.since,
+                    *added.version,
                     ItemStatus::Addition {
                         default_fn: added.default_fn.deref().clone(),
                         ident,
@@ -403,7 +405,7 @@ impl CommonItemAttributes {
                     .map_or_else(|| ty.clone(), |sv| sv.deref().clone());
 
                 actions.insert(
-                    *change.since,
+                    *change.version,
                     ItemStatus::Change {
                         downgrade_with: change.downgrade_with.as_deref().cloned(),
                         upgrade_with: change.upgrade_with.as_deref().cloned(),
@@ -422,7 +424,7 @@ impl CommonItemAttributes {
             // added action if there is any.
             if let Some(added) = self.added {
                 actions.insert(
-                    *added.since,
+                    *added.version,
                     ItemStatus::Addition {
                         default_fn: added.default_fn.deref().clone(),
                         ident,
@@ -437,7 +439,7 @@ impl CommonItemAttributes {
                 let mut actions = BTreeMap::new();
 
                 actions.insert(
-                    *added.since,
+                    *added.version,
                     ItemStatus::Addition {
                         default_fn: added.default_fn.deref().clone(),
                         ident: idents.original().clone(),
@@ -456,11 +458,12 @@ impl CommonItemAttributes {
 /// For the added() action
 ///
 /// Example usage:
-/// - `added(since = "...")`
-/// - `added(since = "...", default_fn = "custom_fn")`
+/// - `added(in = "...")`
+/// - `added(in = "...", default_fn = "custom_fn")`
 #[derive(Clone, Debug, FromMeta)]
 pub struct AddedAttributes {
-    pub since: SpannedValue<Version>,
+    #[darling(rename = "in")]
+    pub version: SpannedValue<Version>,
 
     #[darling(rename = "default", default = "default_default_fn")]
     pub default_fn: SpannedValue<Path>,
@@ -477,14 +480,15 @@ fn default_default_fn() -> SpannedValue<Path> {
 /// For the changed() action
 ///
 /// Example usage:
-/// - `changed(since = "...", previous_name = "...")`
-/// - `changed(since = "...", previous_name = "...", previous_type="...")`
-/// - `changed(since = "...", previous_name = "...", previous_type="...", upgrade_with = "...")`
-/// - `changed(since = "...", previous_name = "...", previous_type="...", downgrade_with = "...")`
-/// - `changed(since = "...", previous_docs = "...")`
+/// - `changed(in = "...", previous_name = "...")`
+/// - `changed(in = "...", previous_name = "...", previous_type="...")`
+/// - `changed(in = "...", previous_name = "...", previous_type="...", upgrade_with = "...")`
+/// - `changed(in = "...", previous_name = "...", previous_type="...", downgrade_with = "...")`
+/// - `changed(in = "...", previous_docs = "...")`
 #[derive(Clone, Debug, FromMeta)]
 pub struct ChangedAttributes {
-    pub since: SpannedValue<Version>,
+    #[darling(rename = "in")]
+    pub version: SpannedValue<Version>,
     pub previous_name: Option<SpannedValue<String>>,
     pub previous_type: Option<SpannedValue<Type>>,
     pub previous_docs: Option<SpannedValue<String>>,
@@ -495,10 +499,11 @@ pub struct ChangedAttributes {
 /// For the deprecated() action
 ///
 /// Example usage:
-/// - `deprecated(since = "...")`
-/// - `deprecated(since = "...", note = "...")`
+/// - `deprecated(in = "...")`
+/// - `deprecated(in = "...", note = "...")`
 #[derive(Clone, Debug, FromMeta)]
 pub struct DeprecatedAttributes {
-    pub since: SpannedValue<Version>,
+    #[darling(rename = "in")]
+    pub version: SpannedValue<Version>,
     pub note: Option<SpannedValue<String>>,
 }
diff --git a/crates/stackable-versioned-macros/src/lib.rs b/crates/stackable-versioned-macros/src/lib.rs
index 81e0f1654..f34dfb5e1 100644
--- a/crates/stackable-versioned-macros/src/lib.rs
+++ b/crates/stackable-versioned-macros/src/lib.rs
@@ -356,7 +356,7 @@ mod utils;
 ///     ))]
 /// #   #[derive(Clone, Debug, Deserialize, Serialize, CustomResource, JsonSchema)]
 ///     pub struct FooSpec {
-///         #[versioned(deprecated(since = "v1beta1"))]
+///         #[versioned(deprecated(in = "v1beta1"))]
 ///         deprecated_bar: usize,
 ///         baz: bool,
 ///     }
@@ -393,7 +393,7 @@ mod utils;
 /// This action indicates that an item is added in a particular version.
 /// Available arguments are:
 ///
-/// - `since` to indicate since which version the item is present.
+/// - `in` to indicate in which version the item was added.
 /// - `default` to customize the default function used to populate the item
 ///   in auto-generated conversion implementations.
 ///
@@ -402,7 +402,7 @@ mod utils;
 /// #[versioned(version(name = "v1alpha1"), version(name = "v1beta1"))]
 /// mod versioned {
 ///     pub struct Foo {
-///         #[versioned(added(since = "v1beta1"))]
+///         #[versioned(added(in = "v1beta1"))]
 ///         bar: usize,
 ///         baz: bool,
 ///     }
@@ -457,7 +457,7 @@ mod utils;
 /// #[versioned(version(name = "v1alpha1"), version(name = "v1beta1"))]
 /// mod versioned {
 ///     pub struct Foo {
-///         #[versioned(added(since = "v1beta1", default = "default_bar"))]
+///         #[versioned(added(in = "v1beta1", default = "default_bar"))]
 ///         bar: usize,
 ///         baz: bool,
 ///     }
@@ -498,7 +498,7 @@ mod utils;
 /// You can choose to change the name, change the type, change the doc comment
 /// or combine multiple changes. Available arguments are:
 ///
-/// - `since` to indicate since which version the item is changed.
+/// - `in` to indicate in which version the item is changed.
 /// - `previous_name` to declare the previous name of the field.
 /// - `previous_type` to declare the previous type of the field.
 /// - `previous_docs` to declare the previous doc comments of the item.
@@ -516,7 +516,7 @@ mod utils;
 /// mod versioned {
 ///     pub struct Foo {
 ///         #[versioned(changed(
-///             since = "v1beta1",
+///             in = "v1beta1",
 ///             previous_name = "prev_bar",
 ///             previous_type = "u16",
 ///             downgrade_with = usize_to_u16
@@ -581,7 +581,7 @@ mod utils;
 /// mod versioned {
 ///     pub struct Foo {
 ///         /// The number of bars.
-///         #[versioned(changed(since = "v1beta1", previous_docs = "The bar."))]
+///         #[versioned(changed(in = "v1beta1", previous_docs = "The bar."))]
 ///         bar: usize,
 ///         baz: bool,
 ///     }
@@ -621,10 +621,10 @@ mod utils;
 ///
 /// ### Deprecated Action
 ///
-/// This action indicates that an item is deprecated in a particular version.
+/// This action indicates that an item was deprecated in a particular version.
 /// Deprecated items are not removed. Available arguments are:
 ///
-/// - `since` to indicate since which version the item is deprecated.
+/// - `in` to indicate in which version the item was deprecated.
 /// - `note` to specify an optional deprecation note.
 ///
 /// ```
@@ -632,7 +632,7 @@ mod utils;
 /// #[versioned(version(name = "v1alpha1"), version(name = "v1beta1"))]
 /// mod versioned {
 ///     pub struct Foo {
-///         #[versioned(deprecated(since = "v1beta1"))]
+///         #[versioned(deprecated(in = "v1beta1"))]
 ///         deprecated_bar: usize,
 ///         baz: bool,
 ///     }
@@ -705,7 +705,7 @@ mod utils;
 /// #[versioned(version(name = "v1alpha1"), version(name = "v1beta1"))]
 /// mod versioned {
 ///     pub struct Foo {
-///         #[versioned(changed(since = "v1beta1", previous_type = "Vec<usize>"), hint(vec))]
+///         #[versioned(changed(in = "v1beta1", previous_type = "Vec<usize>"), hint(vec))]
 ///         bar: Vec<usize>,
 ///         baz: bool,
 ///     }
@@ -747,7 +747,7 @@ mod utils;
 ///     #[versioned(crd(group = "example.com", doc = "My custom resource."))]
 ///     #[derive(Clone, Debug, Deserialize, Serialize, CustomResource, JsonSchema)]
 ///     pub struct FooSpec {
-///         #[versioned(added(since = "v1beta1"))]
+///         #[versioned(added(in = "v1beta1"))]
 ///         bar: usize,
 ///         baz: bool,
 ///     }
@@ -818,10 +818,10 @@ mod utils;
 ///     #[versioned(crd(group = "example.com", doc = "My custom resource."))]
 ///     #[derive(Clone, Debug, Deserialize, Serialize, CustomResource, JsonSchema)]
 ///     pub struct FooSpec {
-///         #[versioned(added(since = "v1beta1"))]
+///         #[versioned(added(in = "v1beta1"))]
 ///         bar: usize,
 ///
-///         #[versioned(added(since = "v1"))]
+///         #[versioned(added(in = "v1"))]
 ///         baz: bool,
 ///
 ///         quox: String,
@@ -966,7 +966,7 @@ mod utils;
 ///     struct Baz {
 ///         quax: String,
 ///
-///         #[versioned(added(since = "v1beta1"))]
+///         #[versioned(added(in = "v1beta1"))]
 ///         quox: bool,
 ///     }
 /// }
@@ -1009,7 +1009,7 @@ mod utils;
 ///     struct Baz {
 ///         quax: String,
 ///
-///         #[versioned(added(since = "v1beta1"))]
+///         #[versioned(added(in = "v1beta1"))]
 ///         quox: bool,
 ///     }
 /// }
diff --git a/crates/stackable-versioned-macros/tests/inputs/fail/changed.rs b/crates/stackable-versioned-macros/tests/inputs/fail/changed.rs
index df9527537..8dc084cf9 100644
--- a/crates/stackable-versioned-macros/tests/inputs/fail/changed.rs
+++ b/crates/stackable-versioned-macros/tests/inputs/fail/changed.rs
@@ -9,9 +9,9 @@ use stackable_versioned_macros::versioned;
 mod versioned {
     struct Foo {
         #[versioned(
-            changed(since = "v1beta1", previous_name = "deprecated_bar"),
-            changed(since = "v1", previous_name = "deprecated_baz"),
-            changed(since = "v2")
+            changed(in = "v1beta1", previous_name = "deprecated_bar"),
+            changed(in = "v1", previous_name = "deprecated_baz"),
+            changed(in = "v2")
         )]
         bar: usize,
     }
diff --git a/crates/stackable-versioned-macros/tests/inputs/fail/changed.stderr b/crates/stackable-versioned-macros/tests/inputs/fail/changed.stderr
index a766cb4f2..8ac7629dc 100644
--- a/crates/stackable-versioned-macros/tests/inputs/fail/changed.stderr
+++ b/crates/stackable-versioned-macros/tests/inputs/fail/changed.stderr
@@ -1,17 +1,17 @@
 error: the previous name must not start with the deprecation prefix
-  --> tests/inputs/fail/changed.rs:12:56
+  --> tests/inputs/fail/changed.rs:12:53
    |
-12 |             changed(since = "v1beta1", previous_name = "deprecated_bar"),
-   |                                                        ^^^^^^^^^^^^^^^^
+12 |             changed(in = "v1beta1", previous_name = "deprecated_bar"),
+   |                                                     ^^^^^^^^^^^^^^^^
 
 error: the previous name must not start with the deprecation prefix
-  --> tests/inputs/fail/changed.rs:13:51
+  --> tests/inputs/fail/changed.rs:13:48
    |
-13 |             changed(since = "v1", previous_name = "deprecated_baz"),
-   |                                                   ^^^^^^^^^^^^^^^^
+13 |             changed(in = "v1", previous_name = "deprecated_baz"),
+   |                                                ^^^^^^^^^^^^^^^^
 
 error: `previous_name`, `previous_type` and `previous_docs` are unset. Is this `changed()` action needed?
-  --> tests/inputs/fail/changed.rs:14:29
+  --> tests/inputs/fail/changed.rs:14:26
    |
-14 |             changed(since = "v2")
-   |                             ^^^^
+14 |             changed(in = "v2")
+   |                          ^^^^
diff --git a/crates/stackable-versioned-macros/tests/inputs/fail/spec_suffix.rs b/crates/stackable-versioned-macros/tests/inputs/fail/spec_suffix.rs
index 33cfaf4ea..7965f3689 100644
--- a/crates/stackable-versioned-macros/tests/inputs/fail/spec_suffix.rs
+++ b/crates/stackable-versioned-macros/tests/inputs/fail/spec_suffix.rs
@@ -12,8 +12,8 @@ mod versioned {
     #[versioned(crd(group = "stackable.tech", doc = "Test"))]
     pub struct Foo {
         #[versioned(
-            added(since = "v1beta1"),
-            changed(since = "v1", previous_name = "bah", previous_type = "u16")
+            added(in = "v1beta1"),
+            changed(in = "v1", previous_name = "bah", previous_type = "u16")
         )]
         bar: usize,
         baz: bool,
diff --git a/crates/stackable-versioned-macros/tests/inputs/fail/unknown_version.rs b/crates/stackable-versioned-macros/tests/inputs/fail/unknown_version.rs
index 5847817c6..6e1ca1b52 100644
--- a/crates/stackable-versioned-macros/tests/inputs/fail/unknown_version.rs
+++ b/crates/stackable-versioned-macros/tests/inputs/fail/unknown_version.rs
@@ -3,7 +3,7 @@ use stackable_versioned_macros::versioned;
 #[versioned(version(name = "v1alpha1"))]
 mod versioned {
     struct Foo {
-        #[versioned(added(since = "v1alpha2"))]
+        #[versioned(added(in = "v1alpha2"))]
         bar: usize,
     }
 }
diff --git a/crates/stackable-versioned-macros/tests/inputs/fail/unknown_version.stderr b/crates/stackable-versioned-macros/tests/inputs/fail/unknown_version.stderr
index 070bd3e2a..f63b5bf32 100644
--- a/crates/stackable-versioned-macros/tests/inputs/fail/unknown_version.stderr
+++ b/crates/stackable-versioned-macros/tests/inputs/fail/unknown_version.stderr
@@ -1,5 +1,5 @@
 error: the `added` action uses a version which is not declared via `#[versioned(version)]`
- --> tests/inputs/fail/unknown_version.rs:6:35
+ --> tests/inputs/fail/unknown_version.rs:6:32
   |
-6 |         #[versioned(added(since = "v1alpha2"))]
-  |                                   ^^^^^^^^^^
+6 |         #[versioned(added(in = "v1alpha2"))]
+  |                                ^^^^^^^^^^
diff --git a/crates/stackable-versioned-macros/tests/inputs/pass/added.rs b/crates/stackable-versioned-macros/tests/inputs/pass/added.rs
index 33b2af588..e1fdd9e43 100644
--- a/crates/stackable-versioned-macros/tests/inputs/pass/added.rs
+++ b/crates/stackable-versioned-macros/tests/inputs/pass/added.rs
@@ -11,10 +11,10 @@ mod versioned {
     struct Foo {
         username: String,
 
-        #[versioned(added(since = "v1alpha2", default = default_first_name))]
+        #[versioned(added(in = "v1alpha2", default = default_first_name))]
         first_name: String,
 
-        #[versioned(added(since = "v1beta1"))]
+        #[versioned(added(in = "v1beta1"))]
         last_name: String,
     }
 }
diff --git a/crates/stackable-versioned-macros/tests/inputs/pass/basic.rs b/crates/stackable-versioned-macros/tests/inputs/pass/basic.rs
index 5a6f0f1d0..38b069afb 100644
--- a/crates/stackable-versioned-macros/tests/inputs/pass/basic.rs
+++ b/crates/stackable-versioned-macros/tests/inputs/pass/basic.rs
@@ -25,8 +25,8 @@ pub(crate) mod versioned {
     )]
     struct FooSpec {
         #[versioned(
-            added(since = "v1beta1"),
-            changed(since = "v1", previous_name = "bah", previous_type = "u16", downgrade_with = usize_to_u16)
+            added(in = "v1beta1"),
+            changed(in = "v1", previous_name = "bah", previous_type = "u16", downgrade_with = usize_to_u16)
         )]
         bar: usize,
         baz: bool,
diff --git a/crates/stackable-versioned-macros/tests/inputs/pass/conversion_tracking.rs b/crates/stackable-versioned-macros/tests/inputs/pass/conversion_tracking.rs
index f7cc4004e..7c820e230 100644
--- a/crates/stackable-versioned-macros/tests/inputs/pass/conversion_tracking.rs
+++ b/crates/stackable-versioned-macros/tests/inputs/pass/conversion_tracking.rs
@@ -18,7 +18,7 @@ pub(crate) mod versioned {
     ))]
     #[derive(Clone, Debug, Deserialize, Serialize, JsonSchema, CustomResource)]
     pub(crate) struct FooSpec {
-        #[versioned(added(since = "v1beta1"), changed(since = "v1", previous_name = "bah"))]
+        #[versioned(added(in = "v1beta1"), changed(in = "v1", previous_name = "bah"))]
         bar: usize,
         baz: bool,
     }
diff --git a/crates/stackable-versioned-macros/tests/inputs/pass/conversion_tracking_enum.rs b/crates/stackable-versioned-macros/tests/inputs/pass/conversion_tracking_enum.rs
index 428ee98d4..2deb5fd7d 100644
--- a/crates/stackable-versioned-macros/tests/inputs/pass/conversion_tracking_enum.rs
+++ b/crates/stackable-versioned-macros/tests/inputs/pass/conversion_tracking_enum.rs
@@ -27,7 +27,9 @@ pub(crate) mod versioned {
 
         // Nested variants with named fields are supported as well.
         #[versioned(nested)]
-        Hive { connector: IcebergConnector },
+        Hive {
+            connector: IcebergConnector,
+        },
 
         // Nested tuple variants with multiple fields use the index as an additional path segment.
         #[versioned(nested)]
@@ -45,7 +47,7 @@ pub(crate) mod versioned {
     pub(crate) struct IcebergConnector {
         metastore: Option<String>,
 
-        #[versioned(added(since = "v1alpha2"))]
+        #[versioned(added(in = "v1alpha2"))]
         rest_catalog_uri: Option<String>,
     }
 }
diff --git a/crates/stackable-versioned-macros/tests/inputs/pass/conversion_tracking_generics.rs b/crates/stackable-versioned-macros/tests/inputs/pass/conversion_tracking_generics.rs
index 2e474e978..73aa07a26 100644
--- a/crates/stackable-versioned-macros/tests/inputs/pass/conversion_tracking_generics.rs
+++ b/crates/stackable-versioned-macros/tests/inputs/pass/conversion_tracking_generics.rs
@@ -18,7 +18,7 @@ pub(crate) mod versioned {
     ))]
     #[derive(Clone, Debug, Deserialize, Serialize, JsonSchema, CustomResource)]
     pub(crate) struct FooSpec {
-        #[versioned(added(since = "v1beta1"), changed(since = "v1", previous_name = "bah"))]
+        #[versioned(added(in = "v1beta1"), changed(in = "v1", previous_name = "bah"))]
         bar: usize,
 
         #[versioned(nested)]
@@ -38,13 +38,13 @@ pub(crate) mod versioned {
         // FIXME (@Techassi): This currently leads to errors, because the generic type S is emitted
         // for v1alpha1 as well. There it is unused. We need to somehow figure out if a generic type
         // is used and if so, emit it. Otherwise, don't emit it.
-        // #[versioned(added(since = "v1beta1"))]
+        // #[versioned(added(in = "v1beta1"))]
         inner_2: S,
 
         // Concrete type on purpose, see the FIXME above. Added in v1 (not v1beta1) so it doesn't
         // share the v1beta1 upgrade bucket with FooSpec::bar.
         // FIXME: This is a known BUG and will be fixed in the future.
-        #[versioned(added(since = "v1"))]
+        #[versioned(added(in = "v1"))]
         inner_3: String,
     }
 }
diff --git a/crates/stackable-versioned-macros/tests/inputs/pass/conversion_tracking_hints.rs b/crates/stackable-versioned-macros/tests/inputs/pass/conversion_tracking_hints.rs
index 77d903fc0..2746e088e 100644
--- a/crates/stackable-versioned-macros/tests/inputs/pass/conversion_tracking_hints.rs
+++ b/crates/stackable-versioned-macros/tests/inputs/pass/conversion_tracking_hints.rs
@@ -20,7 +20,7 @@ mod versioned {
     struct Bar {
         bar_bar: String,
 
-        #[versioned(added(since = "v1alpha2"))]
+        #[versioned(added(in = "v1alpha2"))]
         baz_baz: u8,
     }
 }
diff --git a/crates/stackable-versioned-macros/tests/inputs/pass/crate_overrides.rs b/crates/stackable-versioned-macros/tests/inputs/pass/crate_overrides.rs
index 2c57fa7de..13fd29411 100644
--- a/crates/stackable-versioned-macros/tests/inputs/pass/crate_overrides.rs
+++ b/crates/stackable-versioned-macros/tests/inputs/pass/crate_overrides.rs
@@ -21,7 +21,7 @@ pub mod versioned {
         kube::CustomResource,
     )]
     pub struct FooSpec {
-        #[versioned(added(since = "v1beta1"), changed(since = "v1", previous_name = "bah"))]
+        #[versioned(added(in = "v1beta1"), changed(in = "v1", previous_name = "bah"))]
         bar: usize,
         baz: bool,
     }
diff --git a/crates/stackable-versioned-macros/tests/inputs/pass/crate_overrides_only_kube.rs b/crates/stackable-versioned-macros/tests/inputs/pass/crate_overrides_only_kube.rs
index f2c65607a..7c517770e 100644
--- a/crates/stackable-versioned-macros/tests/inputs/pass/crate_overrides_only_kube.rs
+++ b/crates/stackable-versioned-macros/tests/inputs/pass/crate_overrides_only_kube.rs
@@ -21,7 +21,7 @@ pub mod versioned {
         kube::CustomResource,
     )]
     pub struct FooSpec {
-        #[versioned(added(since = "v1beta1"), changed(since = "v1", previous_name = "bah"))]
+        #[versioned(added(in = "v1beta1"), changed(in = "v1", previous_name = "bah"))]
         bar: usize,
         baz: bool,
     }
diff --git a/crates/stackable-versioned-macros/tests/inputs/pass/docs.rs b/crates/stackable-versioned-macros/tests/inputs/pass/docs.rs
index 2a02bc331..f428d1b58 100644
--- a/crates/stackable-versioned-macros/tests/inputs/pass/docs.rs
+++ b/crates/stackable-versioned-macros/tests/inputs/pass/docs.rs
@@ -24,23 +24,23 @@ mod versioned {
         foo: String,
 
         /// Keep the main field docs the same, even after the field is deprecated.
-        #[versioned(deprecated(since = "v1beta1", note = "gone"))]
+        #[versioned(deprecated(in = "v1beta1", note = "gone"))]
         deprecated_bar: String,
 
         /// This is for baz
-        #[versioned(added(since = "v1beta1"))]
+        #[versioned(added(in = "v1beta1"))]
         baz: String,
 
         /// This is will keep changing over time.
-        #[versioned(changed(since = "v1beta1", previous_name = "qoox"))]
-        #[versioned(changed(since = "v1", previous_name = "qaax"))]
+        #[versioned(changed(in = "v1beta1", previous_name = "qoox"))]
+        #[versioned(changed(in = "v1", previous_name = "qaax"))]
         quux: String,
 
         /// The docs of this field changed in v1beta1 and v2.
         #[versioned(
-            changed(since = "v1beta1", previous_docs = "These are the docs in v1alpha1."),
+            changed(in = "v1beta1", previous_docs = "These are the docs in v1alpha1."),
             changed(
-                since = "v2",
+                in = "v2",
                 previous_docs = r#"
                     These are the docs from v1beta1 until v1.
 
@@ -55,8 +55,8 @@ mod versioned {
 
         /// The docs of this field changed in v1, while it was renamed in v1beta1.
         #[versioned(
-            changed(since = "v1beta1", previous_name = "waldo"),
-            changed(since = "v1", previous_docs = "These are the docs before v1.")
+            changed(in = "v1beta1", previous_name = "waldo"),
+            changed(in = "v1", previous_docs = "These are the docs before v1.")
         )]
         fred: String,
     }
@@ -65,7 +65,7 @@ mod versioned {
     #[derive(Default)]
     enum Bar {
         /// The docs of this variant changed in v1.
-        #[versioned(changed(since = "v1", previous_docs = "These are the docs before v1."))]
+        #[versioned(changed(in = "v1", previous_docs = "These are the docs before v1."))]
         #[default]
         Baz,
     }
diff --git a/crates/stackable-versioned-macros/tests/inputs/pass/downgrade_with.rs b/crates/stackable-versioned-macros/tests/inputs/pass/downgrade_with.rs
index 68e91cf83..5e33bf269 100644
--- a/crates/stackable-versioned-macros/tests/inputs/pass/downgrade_with.rs
+++ b/crates/stackable-versioned-macros/tests/inputs/pass/downgrade_with.rs
@@ -8,8 +8,8 @@ mod versioned {
             // This tests two additional things:
             // - that both unquoted and quoted usage works
             // - that the renamed name does get picked up correctly by the conversion function
-            changed(since = "v1", previous_type = "u16", previous_name = "bar", downgrade_with = u32_to_u16),
-            changed(since = "v2", previous_type = "u32", downgrade_with = "u64_to_u32")
+            changed(in = "v1", previous_type = "u16", previous_name = "bar", downgrade_with = u32_to_u16),
+            changed(in = "v2", previous_type = "u32", downgrade_with = "u64_to_u32")
         )]
         baz: u64,
     }
diff --git a/crates/stackable-versioned-macros/tests/inputs/pass/enum_fields.rs b/crates/stackable-versioned-macros/tests/inputs/pass/enum_fields.rs
index 87746533d..ef584f51e 100644
--- a/crates/stackable-versioned-macros/tests/inputs/pass/enum_fields.rs
+++ b/crates/stackable-versioned-macros/tests/inputs/pass/enum_fields.rs
@@ -4,7 +4,7 @@ use stackable_versioned::versioned;
 // ---
 pub mod versioned {
     enum Foo {
-        #[versioned(changed(since = "v1alpha2", previous_name = "PrevA"))]
+        #[versioned(changed(in = "v1alpha2", previous_name = "PrevA"))]
         A {
             aa: usize,
             aaa: u64,
@@ -15,7 +15,7 @@ pub mod versioned {
     }
 
     enum Bar {
-        #[versioned(changed(since = "v1alpha2", previous_name = "PrevA"))]
+        #[versioned(changed(in = "v1alpha2", previous_name = "PrevA"))]
         A(A),
         B {},
     }
diff --git a/crates/stackable-versioned-macros/tests/inputs/pass/hint_map.rs b/crates/stackable-versioned-macros/tests/inputs/pass/hint_map.rs
index 054abb029..cc37ff608 100644
--- a/crates/stackable-versioned-macros/tests/inputs/pass/hint_map.rs
+++ b/crates/stackable-versioned-macros/tests/inputs/pass/hint_map.rs
@@ -7,7 +7,7 @@ use stackable_versioned::versioned;
 pub(crate) mod versioned {
     pub(crate) struct Foo {
         #[versioned(
-            changed(since = "v1alpha2", previous_type = "HashMap<String, u8>"),
+            changed(in = "v1alpha2", previous_type = "HashMap<String, u8>"),
             hint(map)
         )]
         bar: HashMap<String, Bar>,
diff --git a/crates/stackable-versioned-macros/tests/inputs/pass/module.rs b/crates/stackable-versioned-macros/tests/inputs/pass/module.rs
index dc4d15d85..cea075358 100644
--- a/crates/stackable-versioned-macros/tests/inputs/pass/module.rs
+++ b/crates/stackable-versioned-macros/tests/inputs/pass/module.rs
@@ -25,10 +25,10 @@ pub(crate) mod versioned {
     pub struct FooSpec {
         bar: usize,
 
-        #[versioned(added(since = "v1"))]
+        #[versioned(added(in = "v1"))]
         baz: bool,
 
-        #[versioned(deprecated(since = "v2alpha1"))]
+        #[versioned(deprecated(in = "v2alpha1"))]
         deprecated_foo: String,
     }
 
diff --git a/crates/stackable-versioned-macros/tests/inputs/pass/module_preserve.rs b/crates/stackable-versioned-macros/tests/inputs/pass/module_preserve.rs
index cbef0f19e..bbd093314 100644
--- a/crates/stackable-versioned-macros/tests/inputs/pass/module_preserve.rs
+++ b/crates/stackable-versioned-macros/tests/inputs/pass/module_preserve.rs
@@ -26,10 +26,10 @@ pub(crate) mod versioned {
     pub struct FooSpec {
         bar: usize,
 
-        #[versioned(added(since = "v1"))]
+        #[versioned(added(in = "v1"))]
         baz: bool,
 
-        #[versioned(deprecated(since = "v2alpha1"))]
+        #[versioned(deprecated(in = "v2alpha1"))]
         deprecated_foo: String,
     }
 
diff --git a/crates/stackable-versioned-macros/tests/inputs/pass/renamed_field.rs b/crates/stackable-versioned-macros/tests/inputs/pass/renamed_field.rs
index 8ad49c053..68f319552 100644
--- a/crates/stackable-versioned-macros/tests/inputs/pass/renamed_field.rs
+++ b/crates/stackable-versioned-macros/tests/inputs/pass/renamed_field.rs
@@ -8,7 +8,7 @@ use stackable_versioned::versioned;
 // ---
 mod versioned {
     struct Foo {
-        #[versioned(changed(since = "v1beta1", previous_name = "bat"))]
+        #[versioned(changed(in = "v1beta1", previous_name = "bat"))]
         bar: usize,
         baz: bool,
     }
diff --git a/crates/stackable-versioned-macros/tests/inputs/pass/renamed_kind.rs b/crates/stackable-versioned-macros/tests/inputs/pass/renamed_kind.rs
index d63bbdabe..050810a5a 100644
--- a/crates/stackable-versioned-macros/tests/inputs/pass/renamed_kind.rs
+++ b/crates/stackable-versioned-macros/tests/inputs/pass/renamed_kind.rs
@@ -17,7 +17,7 @@ pub mod versioned {
         kube::CustomResource,
     )]
     pub struct FooSpec {
-        #[versioned(added(since = "v1beta1"), changed(since = "v1", previous_name = "bah"))]
+        #[versioned(added(in = "v1beta1"), changed(in = "v1", previous_name = "bah"))]
         bar: usize,
         baz: bool,
     }
diff --git a/crates/stackable-versioned/CHANGELOG.md b/crates/stackable-versioned/CHANGELOG.md
index 243db790a..21892ae2a 100644
--- a/crates/stackable-versioned/CHANGELOG.md
+++ b/crates/stackable-versioned/CHANGELOG.md
@@ -12,6 +12,7 @@ All notable changes to this project will be documented in this file.
 
 ### Changed
 
+- BREAKING: Rename the `since` argument of all three actions (added, changed, and deprecated) to `in` ([#1311]).
 - BREAKING: Rename all `from_` arguments to `previous_` ([#1313]).
 - BREAKING: `stackable_versioned::ChangedValue`'s `value` field type is now `serde_json::Value` instead
   of `yaml_serde::Value` ([#1307]).
@@ -29,6 +30,7 @@ All notable changes to this project will be documented in this file.
 [#1306]: https://github.com/stackabletech/operator-rs/pull/1306
 [#1307]: https://github.com/stackabletech/operator-rs/pull/1307
 [#1309]: https://github.com/stackabletech/operator-rs/pull/1309
+[#1311]: https://github.com/stackabletech/operator-rs/pull/1311
 [#1312]: https://github.com/stackabletech/operator-rs/pull/1312
 [#1313]: https://github.com/stackabletech/operator-rs/pull/1313
 
diff --git a/crates/stackable-versioned/tests/person.rs b/crates/stackable-versioned/tests/person.rs
index 949a5e05c..199506728 100644
--- a/crates/stackable-versioned/tests/person.rs
+++ b/crates/stackable-versioned/tests/person.rs
@@ -62,23 +62,23 @@ pub mod versioned {
         username: String,
 
         // In v1alpha2 first and last name have been added
-        #[versioned(added(since = "v1alpha2"))]
+        #[versioned(added(in = "v1alpha2"))]
         first_name: String,
 
-        #[versioned(added(since = "v1alpha2"))]
+        #[versioned(added(in = "v1alpha2"))]
         last_name: String,
 
         // We started out with a enum. As we *need* to provide a default, we have a Unknown variant.
         // Afterwards we figured let's be more flexible and accept any arbitrary String.
 
         // FIXME: The roundtrips are currently broken, see the `roundtrip_test_data` below.
-        #[versioned(added(since = "v2"), changed(since = "v3", previous_type = "Gender"))]
+        #[versioned(added(in = "v2"), changed(in = "v3", previous_type = "Gender"))]
         gender: String,
 
         // TODO (@Techassi): Dealing with Default here is kinda meh UX wise. What would really help
         // is enabling per-container versioning and maybe the ability to place impl blocks in here
         // for automatic implementations for all versions of a container.
-        #[versioned(added(since = "v1alpha2", default = default_relationship), nested)]
+        #[versioned(added(in = "v1alpha2", default = default_relationship), nested)]
         relationship: Relationship,
 
         #[versioned(nested)]
@@ -102,7 +102,7 @@ pub mod versioned {
     pub struct Married {
         with: String,
 
-        #[versioned(added(since = "v2"))]
+        #[versioned(added(in = "v2"))]
         since: String,
     }
 
@@ -110,7 +110,7 @@ pub mod versioned {
     pub struct Socials {
         email: String,
 
-        #[versioned(added(since = "v1beta1"))]
+        #[versioned(added(in = "v1beta1"))]
         mastodon: String,
     }
 }