From fc9487df66b626f63fcde9944cbe8ec6d53525ed Mon Sep 17 00:00:00 2001
From: "github-actions[bot]"
 <41898282+github-actions[bot]@users.noreply.github.com>
Date: Sat, 24 Oct 2026 00:23:30 +0000
Subject: [PATCH 1/3] Update supported GitHub Enterprise Server versions

---
 lib/entry-points.js        | 2 +-
 src/api-compatibility.json | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/entry-points.js b/lib/entry-points.js
index 7cea6c0b6d..2e8b97e41b 100644
--- a/lib/entry-points.js
+++ b/lib/entry-points.js
@@ -169371,7 +169371,7 @@ var semver = __toESM(require_semver2());
 
 // src/api-compatibility.json
 var maximumVersion = "3.23";
-var minimumVersion = "3.18";
+var minimumVersion = "3.19";
 
 // src/json/index.ts
 function parseString(data) {
diff --git a/src/api-compatibility.json b/src/api-compatibility.json
index c1122fb2a9..83ff180db0 100644
--- a/src/api-compatibility.json
+++ b/src/api-compatibility.json
@@ -1 +1 @@
-{"maximumVersion":"3.23","minimumVersion":"3.18"}
+{"maximumVersion":"3.23","minimumVersion":"3.19"}

From bfac910f062c231a0c79c6b518252b3e5c1e1433 Mon Sep 17 00:00:00 2001
From: Henry Mercer <henrymercer@github.com>
Date: Mon, 26 Oct 2026 16:43:13 +0000
Subject: [PATCH 2/3] Update CodeQL deprecation warning for GHES 3.18

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
---
 lib/entry-points.js                              | 6 +++---
 src/codeql.ts                                    | 6 +++---
 unreleased-change-notes/ghes-3-18-deprecation.md | 1 +
 3 files changed, 7 insertions(+), 6 deletions(-)
 create mode 100644 unreleased-change-notes/ghes-3-18-deprecation.md

diff --git a/lib/entry-points.js b/lib/entry-points.js
index 2e8b97e41b..196ca5584f 100644
--- a/lib/entry-points.js
+++ b/lib/entry-points.js
@@ -176948,9 +176948,9 @@ async function getCombinedTracerConfig(logger2, codeql, config) {
 // src/codeql.ts
 var cachedCodeQL = void 0;
 var CODEQL_MINIMUM_VERSION = "2.20.7";
-var CODEQL_NEXT_MINIMUM_VERSION = "2.21.3";
-var GHES_VERSION_MOST_RECENTLY_DEPRECATED = "3.17";
-var GHES_MOST_RECENT_DEPRECATION_DATE = "2026-09-24";
+var CODEQL_NEXT_MINIMUM_VERSION = "2.22.4";
+var GHES_VERSION_MOST_RECENTLY_DEPRECATED = "3.18";
+var GHES_MOST_RECENT_DEPRECATION_DATE = "2026-10-16";
 var EXTRACTION_DEBUG_MODE_VERBOSITY = "progress++";
 function isDiskConfigurationError(e) {
   if (!(e instanceof Error)) {
diff --git a/src/codeql.ts b/src/codeql.ts
index 28ba2243e9..c1a8f4f340 100644
--- a/src/codeql.ts
+++ b/src/codeql.ts
@@ -260,17 +260,17 @@ const CODEQL_MINIMUM_VERSION = "2.20.7";
 /**
  * This version will shortly become the oldest version of CodeQL that the Action will run with.
  */
-const CODEQL_NEXT_MINIMUM_VERSION = "2.21.3";
+const CODEQL_NEXT_MINIMUM_VERSION = "2.22.4";
 
 /**
  * This is the version of GHES that was most recently deprecated.
  */
-const GHES_VERSION_MOST_RECENTLY_DEPRECATED = "3.17";
+const GHES_VERSION_MOST_RECENTLY_DEPRECATED = "3.18";
 
 /**
  * This is the deprecation date for the version of GHES that was most recently deprecated.
  */
-const GHES_MOST_RECENT_DEPRECATION_DATE = "2026-09-24";
+const GHES_MOST_RECENT_DEPRECATION_DATE = "2026-10-16";
 
 /** The CLI verbosity level to use for extraction in debug mode. */
 const EXTRACTION_DEBUG_MODE_VERBOSITY = "progress++";
diff --git a/unreleased-change-notes/ghes-3-18-deprecation.md b/unreleased-change-notes/ghes-3-18-deprecation.md
new file mode 100644
index 0000000000..0e33d39327
--- /dev/null
+++ b/unreleased-change-notes/ghes-3-18-deprecation.md
@@ -0,0 +1 @@
+- _Upcoming breaking change_: CodeQL version 2.22.3 and earlier were discontinued on 16 October 2026 alongside GitHub Enterprise Server 3.18, and will be unsupported by the next minor release of the CodeQL Action. Added a deprecation warning for customers using these versions of CodeQL. [#4266](https://github.com/github/codeql-action/pull/4266)

From 4a890e46e0120cbc79363f096897ef7861ea7831 Mon Sep 17 00:00:00 2001
From: Henry Mercer <henrymercer@github.com>
Date: Mon, 26 Oct 2026 16:43:21 +0000
Subject: [PATCH 3/3] Remove GHES 3.18 from compatibility table

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
---
 README.md | 1 -
 1 file changed, 1 deletion(-)

diff --git a/README.md b/README.md
index 8c4fc46631..d738adcab6 100644
--- a/README.md
+++ b/README.md
@@ -76,7 +76,6 @@ We typically release new minor versions of the CodeQL Action and Bundle when a n
 | `v4.33.0` | `2.24.3` | Enterprise Server 3.21 | |
 | `v4.31.10` | `2.23.9` | Enterprise Server 3.20 | |
 | `v3.29.11` | `2.22.4` | Enterprise Server 3.19 | |
-| `v3.28.21` | `2.21.3` | Enterprise Server 3.18 | |
 
 See the full list of GHES release and deprecation dates at [GitHub Enterprise Server releases](https://docs.github.com/en/enterprise-server/admin/all-releases#releases-of-github-enterprise-server).