diff --git a/CHANGELOG.md b/CHANGELOG.md
index ab807ccbb7e..deb69f5138b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,5 @@
+## 3.9.0
+
 ## 3.8.0
 
 **Released on:** Unreleased
diff --git a/pkg/_fe_analyzer_shared/lib/src/experiments/flags.dart b/pkg/_fe_analyzer_shared/lib/src/experiments/flags.dart
index 039242195aa..0f552d24df7 100644
--- a/pkg/_fe_analyzer_shared/lib/src/experiments/flags.dart
+++ b/pkg/_fe_analyzer_shared/lib/src/experiments/flags.dart
@@ -6,7 +6,7 @@
 //
 // Instead modify 'tools/experimental_features.yaml' and run
 // 'dart pkg/front_end/tool/cfe.dart generate-experimental-flags' to update.
-const Version defaultLanguageVersion = const Version(3, 8);
+const Version defaultLanguageVersion = const Version(3, 9);
 
 /// Enum for experimental flags shared between the CFE and the analyzer.
 enum ExperimentalFlag {
@@ -29,7 +29,7 @@ enum ExperimentalFlag {
       isEnabledByDefault: false,
       isExpired: false,
       experimentEnabledVersion: defaultLanguageVersion,
-      experimentReleasedVersion: defaultLanguageVersion),
+      experimentReleasedVersion: const Version(3, 8)),
 
   constantUpdate2018(
       name: 'constant-update-2018',
@@ -64,7 +64,7 @@ enum ExperimentalFlag {
       isEnabledByDefault: false,
       isExpired: false,
       experimentEnabledVersion: defaultLanguageVersion,
-      experimentReleasedVersion: defaultLanguageVersion),
+      experimentReleasedVersion: const Version(3, 8)),
 
   enhancedEnums(
       name: 'enhanced-enums',
@@ -99,7 +99,7 @@ enum ExperimentalFlag {
       isEnabledByDefault: false,
       isExpired: false,
       experimentEnabledVersion: defaultLanguageVersion,
-      experimentReleasedVersion: defaultLanguageVersion),
+      experimentReleasedVersion: const Version(3, 8)),
 
   inferenceUpdate1(
       name: 'inference-update-1',
@@ -127,7 +127,7 @@ enum ExperimentalFlag {
       isEnabledByDefault: false,
       isExpired: false,
       experimentEnabledVersion: defaultLanguageVersion,
-      experimentReleasedVersion: defaultLanguageVersion),
+      experimentReleasedVersion: const Version(3, 8)),
 
   inferenceUsingBounds(
       name: 'inference-using-bounds',
@@ -274,7 +274,7 @@ enum ExperimentalFlag {
       isEnabledByDefault: false,
       isExpired: false,
       experimentEnabledVersion: defaultLanguageVersion,
-      experimentReleasedVersion: defaultLanguageVersion),
+      experimentReleasedVersion: const Version(3, 8)),
 
   wildcardVariables(
       name: 'wildcard-variables',
diff --git a/pkg/analyzer/lib/src/dart/analysis/driver.dart b/pkg/analyzer/lib/src/dart/analysis/driver.dart
index eee4eb29e7d..80780c6ef38 100644
--- a/pkg/analyzer/lib/src/dart/analysis/driver.dart
+++ b/pkg/analyzer/lib/src/dart/analysis/driver.dart
@@ -100,7 +100,7 @@ import 'package:meta/meta.dart';
 // TODO(scheglov): Clean up the list of implicitly analyzed files.
 class AnalysisDriver {
   /// The version of data format, should be incremented on every format change.
-  static const int DATA_VERSION = 450;
+  static const int DATA_VERSION = 451;
 
   /// The number of exception contexts allowed to write. Once this field is
   /// zero, we stop writing any new exception contexts in this process.
diff --git a/pkg/analyzer/lib/src/dart/analysis/experiments.g.dart b/pkg/analyzer/lib/src/dart/analysis/experiments.g.dart
index c38465d7f38..c50ac00eedc 100644
--- a/pkg/analyzer/lib/src/dart/analysis/experiments.g.dart
+++ b/pkg/analyzer/lib/src/dart/analysis/experiments.g.dart
@@ -12,7 +12,7 @@ part of 'experiments.dart';
 
 /// The current version of the Dart language (or, for non-stable releases, the
 /// version of the language currently in the process of being developed).
-const _currentVersion = '3.8.0';
+const _currentVersion = '3.9.0';
 
 /// A map containing information about all known experimental flags.
 final _knownFeatures = <String, ExperimentalFeature>{
@@ -212,7 +212,7 @@ class ExperimentalFeatures {
     isExpired: IsExpired.const_functions,
     documentation:
         'Allow more of the Dart language to be executed in const expressions.',
-    experimentalReleaseVersion: null,
+    experimentalReleaseVersion: Version.parse('3.8.0'),
     releaseVersion: null,
     channels: ["stable", "beta", "dev", "main"],
   );
@@ -268,7 +268,7 @@ class ExperimentalFeatures {
     isEnabledByDefault: IsEnabledByDefault.dot_shorthands,
     isExpired: IsExpired.dot_shorthands,
     documentation: 'Shorter dot syntax for static accesses.',
-    experimentalReleaseVersion: null,
+    experimentalReleaseVersion: Version.parse('3.8.0'),
     releaseVersion: null,
     channels: ["stable", "beta", "dev", "main"],
   );
@@ -325,7 +325,7 @@ class ExperimentalFeatures {
     isExpired: IsExpired.getter_setter_error,
     documentation:
         'Stop reporting errors about mismatching types in a getter/setter pair.',
-    experimentalReleaseVersion: null,
+    experimentalReleaseVersion: Version.parse('3.8.0'),
     releaseVersion: null,
     channels: ["stable", "beta", "dev", "main"],
   );
@@ -371,7 +371,7 @@ class ExperimentalFeatures {
     isEnabledByDefault: IsEnabledByDefault.inference_update_4,
     isExpired: IsExpired.inference_update_4,
     documentation: 'A bundle of updates to type inference.',
-    experimentalReleaseVersion: null,
+    experimentalReleaseVersion: Version.parse('3.8.0'),
     releaseVersion: null,
     channels: ["stable", "beta", "dev", "main"],
   );
@@ -605,7 +605,7 @@ class ExperimentalFeatures {
     isEnabledByDefault: IsEnabledByDefault.variance,
     isExpired: IsExpired.variance,
     documentation: 'Sound variance',
-    experimentalReleaseVersion: null,
+    experimentalReleaseVersion: Version.parse('3.8.0'),
     releaseVersion: null,
     channels: ["stable", "beta", "dev", "main"],
   );
diff --git a/pkg/analyzer/test/src/diagnostics/invalid_language_override_greater_test.dart b/pkg/analyzer/test/src/diagnostics/invalid_language_override_greater_test.dart
index 25752f5f748..e39e6733d0f 100644
--- a/pkg/analyzer/test/src/diagnostics/invalid_language_override_greater_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/invalid_language_override_greater_test.dart
@@ -27,7 +27,7 @@ class InvalidLanguageOverrideGreaterTest extends PubPackageResolutionTest {
 // @dart = ${latestVersion.major}.${latestVersion.minor + 1}
 class A {}
 ''', [
-      error(WarningCode.INVALID_LANGUAGE_VERSION_OVERRIDE_GREATER, 0, 14),
+      error(WarningCode.INVALID_LANGUAGE_VERSION_OVERRIDE_GREATER, 0, 15),
     ]);
     _assertUnitLanguageVersion(
       package: latestVersion,
diff --git a/pkg/dart_internal/pubspec.yaml b/pkg/dart_internal/pubspec.yaml
index 7a543cc57b5..1843b96f34b 100644
--- a/pkg/dart_internal/pubspec.yaml
+++ b/pkg/dart_internal/pubspec.yaml
@@ -9,7 +9,7 @@ repository: https://github.com/dart-lang/sdk/tree/main/pkg/dart_internal
 environment:
   # Restrict the upper bound so that we can remove support for this in a later
   # version of the SDK without it being a breaking change.
-  sdk: '>=3.5.0 <3.9.0'
+  sdk: '>=3.5.0 <3.10.0'
 
 resolution: workspace
 
diff --git a/pkg/front_end/lib/src/api_prototype/experimental_flags_generated.dart b/pkg/front_end/lib/src/api_prototype/experimental_flags_generated.dart
index 19d097f17ab..fe107fe9ffe 100644
--- a/pkg/front_end/lib/src/api_prototype/experimental_flags_generated.dart
+++ b/pkg/front_end/lib/src/api_prototype/experimental_flags_generated.dart
@@ -81,7 +81,7 @@ class ExperimentalFlag {
       isExpired: false,
       enabledVersion: defaultLanguageVersion,
       experimentEnabledVersion: defaultLanguageVersion,
-      experimentReleasedVersion: defaultLanguageVersion);
+      experimentReleasedVersion: const Version(3, 8));
 
   static const ExperimentalFlag constantUpdate2018 = const ExperimentalFlag(
       name: 'constant-update-2018',
@@ -121,7 +121,7 @@ class ExperimentalFlag {
       isExpired: false,
       enabledVersion: defaultLanguageVersion,
       experimentEnabledVersion: defaultLanguageVersion,
-      experimentReleasedVersion: defaultLanguageVersion);
+      experimentReleasedVersion: const Version(3, 8));
 
   static const ExperimentalFlag enhancedEnums = const ExperimentalFlag(
       name: 'enhanced-enums',
@@ -161,7 +161,7 @@ class ExperimentalFlag {
       isExpired: false,
       enabledVersion: defaultLanguageVersion,
       experimentEnabledVersion: defaultLanguageVersion,
-      experimentReleasedVersion: defaultLanguageVersion);
+      experimentReleasedVersion: const Version(3, 8));
 
   static const ExperimentalFlag inferenceUpdate1 = const ExperimentalFlag(
       name: 'inference-update-1',
@@ -193,7 +193,7 @@ class ExperimentalFlag {
       isExpired: false,
       enabledVersion: defaultLanguageVersion,
       experimentEnabledVersion: defaultLanguageVersion,
-      experimentReleasedVersion: defaultLanguageVersion);
+      experimentReleasedVersion: const Version(3, 8));
 
   static const ExperimentalFlag inferenceUsingBounds = const ExperimentalFlag(
       name: 'inference-using-bounds',
@@ -361,7 +361,7 @@ class ExperimentalFlag {
       isExpired: false,
       enabledVersion: defaultLanguageVersion,
       experimentEnabledVersion: defaultLanguageVersion,
-      experimentReleasedVersion: defaultLanguageVersion);
+      experimentReleasedVersion: const Version(3, 8));
 
   static const ExperimentalFlag wildcardVariables = const ExperimentalFlag(
       name: 'wildcard-variables',
diff --git a/pkg/front_end/testcases/general/too_high_version/main.dart.strong.expect b/pkg/front_end/testcases/general/too_high_version/main.dart.strong.expect
index 20f8d69da80..41ae4ad2163 100644
--- a/pkg/front_end/testcases/general/too_high_version/main.dart.strong.expect
+++ b/pkg/front_end/testcases/general/too_high_version/main.dart.strong.expect
@@ -1,7 +1,7 @@
 //
 // Problems outside component:
 //
-// pkg/front_end/testcases/general/too_high_version/too_high/lib/too_high_lib.dart:1:1: Error: The language version 100.200 specified for the package 'too_high' is too high. The highest supported language version is 3.8.
+// pkg/front_end/testcases/general/too_high_version/too_high/lib/too_high_lib.dart:1:1: Error: The language version 100.200 specified for the package 'too_high' is too high. The highest supported language version is 3.9.
 // // Copyright (c) 2024, the Dart project authors.  Please see the AUTHORS file
 // ^
 //
diff --git a/pkg/front_end/testcases/general/too_high_version/main.dart.strong.modular.expect b/pkg/front_end/testcases/general/too_high_version/main.dart.strong.modular.expect
index 20f8d69da80..41ae4ad2163 100644
--- a/pkg/front_end/testcases/general/too_high_version/main.dart.strong.modular.expect
+++ b/pkg/front_end/testcases/general/too_high_version/main.dart.strong.modular.expect
@@ -1,7 +1,7 @@
 //
 // Problems outside component:
 //
-// pkg/front_end/testcases/general/too_high_version/too_high/lib/too_high_lib.dart:1:1: Error: The language version 100.200 specified for the package 'too_high' is too high. The highest supported language version is 3.8.
+// pkg/front_end/testcases/general/too_high_version/too_high/lib/too_high_lib.dart:1:1: Error: The language version 100.200 specified for the package 'too_high' is too high. The highest supported language version is 3.9.
 // // Copyright (c) 2024, the Dart project authors.  Please see the AUTHORS file
 // ^
 //
diff --git a/pkg/front_end/testcases/general/too_high_version/main.dart.strong.outline.expect b/pkg/front_end/testcases/general/too_high_version/main.dart.strong.outline.expect
index 20f8d69da80..41ae4ad2163 100644
--- a/pkg/front_end/testcases/general/too_high_version/main.dart.strong.outline.expect
+++ b/pkg/front_end/testcases/general/too_high_version/main.dart.strong.outline.expect
@@ -1,7 +1,7 @@
 //
 // Problems outside component:
 //
-// pkg/front_end/testcases/general/too_high_version/too_high/lib/too_high_lib.dart:1:1: Error: The language version 100.200 specified for the package 'too_high' is too high. The highest supported language version is 3.8.
+// pkg/front_end/testcases/general/too_high_version/too_high/lib/too_high_lib.dart:1:1: Error: The language version 100.200 specified for the package 'too_high' is too high. The highest supported language version is 3.9.
 // // Copyright (c) 2024, the Dart project authors.  Please see the AUTHORS file
 // ^
 //
diff --git a/pkg/front_end/testcases/general/version_too_high.dart.strong.expect b/pkg/front_end/testcases/general/version_too_high.dart.strong.expect
index 3fc3380fd01..9bed2ff2a8c 100644
--- a/pkg/front_end/testcases/general/version_too_high.dart.strong.expect
+++ b/pkg/front_end/testcases/general/version_too_high.dart.strong.expect
@@ -2,7 +2,7 @@ library;
 //
 // Problems in library:
 //
-// pkg/front_end/testcases/general/version_too_high.dart:5:1: Error: The specified language version 100.200 is too high. The highest supported language version is 3.8.
+// pkg/front_end/testcases/general/version_too_high.dart:5:1: Error: The specified language version 100.200 is too high. The highest supported language version is 3.9.
 // // @dart=100.200
 // ^^^^^^^^^^^^^^^^
 //
diff --git a/pkg/front_end/testcases/general/version_too_high.dart.strong.modular.expect b/pkg/front_end/testcases/general/version_too_high.dart.strong.modular.expect
index 3fc3380fd01..9bed2ff2a8c 100644
--- a/pkg/front_end/testcases/general/version_too_high.dart.strong.modular.expect
+++ b/pkg/front_end/testcases/general/version_too_high.dart.strong.modular.expect
@@ -2,7 +2,7 @@ library;
 //
 // Problems in library:
 //
-// pkg/front_end/testcases/general/version_too_high.dart:5:1: Error: The specified language version 100.200 is too high. The highest supported language version is 3.8.
+// pkg/front_end/testcases/general/version_too_high.dart:5:1: Error: The specified language version 100.200 is too high. The highest supported language version is 3.9.
 // // @dart=100.200
 // ^^^^^^^^^^^^^^^^
 //
diff --git a/pkg/front_end/testcases/general/version_too_high.dart.strong.outline.expect b/pkg/front_end/testcases/general/version_too_high.dart.strong.outline.expect
index 4bf1b99a8d8..d0eb4db0522 100644
--- a/pkg/front_end/testcases/general/version_too_high.dart.strong.outline.expect
+++ b/pkg/front_end/testcases/general/version_too_high.dart.strong.outline.expect
@@ -2,7 +2,7 @@ library;
 //
 // Problems in library:
 //
-// pkg/front_end/testcases/general/version_too_high.dart:5:1: Error: The specified language version 100.200 is too high. The highest supported language version is 3.8.
+// pkg/front_end/testcases/general/version_too_high.dart:5:1: Error: The specified language version 100.200 is too high. The highest supported language version is 3.9.
 // // @dart=100.200
 // ^^^^^^^^^^^^^^^^
 //
diff --git a/pkg/front_end/testcases/general/version_too_high.dart.strong.transformed.expect b/pkg/front_end/testcases/general/version_too_high.dart.strong.transformed.expect
index 3fc3380fd01..9bed2ff2a8c 100644
--- a/pkg/front_end/testcases/general/version_too_high.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/general/version_too_high.dart.strong.transformed.expect
@@ -2,7 +2,7 @@ library;
 //
 // Problems in library:
 //
-// pkg/front_end/testcases/general/version_too_high.dart:5:1: Error: The specified language version 100.200 is too high. The highest supported language version is 3.8.
+// pkg/front_end/testcases/general/version_too_high.dart:5:1: Error: The specified language version 100.200 is too high. The highest supported language version is 3.9.
 // // @dart=100.200
 // ^^^^^^^^^^^^^^^^
 //
diff --git a/pkg/kernel/lib/default_language_version.dart b/pkg/kernel/lib/default_language_version.dart
index d107afdbb4d..1652442550e 100644
--- a/pkg/kernel/lib/default_language_version.dart
+++ b/pkg/kernel/lib/default_language_version.dart
@@ -9,4 +9,4 @@
 
 import "ast.dart";
 
-const Version defaultLanguageVersion = const Version(3, 8);
+const Version defaultLanguageVersion = const Version(3, 9);
diff --git a/sdk_packages.yaml b/sdk_packages.yaml
index 49be0e9c5ac..8d0c3b7efdb 100644
--- a/sdk_packages.yaml
+++ b/sdk_packages.yaml
@@ -2,3 +2,4 @@
 version: 1
 sdk: dart
 # Note that paths are relative to the root of the built SDK.
+packages: []
diff --git a/tools/VERSION b/tools/VERSION
index 940f07d1348..5429ee7dbcb 100644
--- a/tools/VERSION
+++ b/tools/VERSION
@@ -25,7 +25,7 @@
 #
 CHANNEL main
 MAJOR 3
-MINOR 8
+MINOR 9
 PATCH 0
 PRERELEASE 0
 PRERELEASE_PATCH 0
diff --git a/tools/experimental_features.yaml b/tools/experimental_features.yaml
index 115478df5db..8b72cf3736d 100644
--- a/tools/experimental_features.yaml
+++ b/tools/experimental_features.yaml
@@ -110,13 +110,15 @@
 # default 'language' "category" with code generated for both CFE and Analyzer,
 # while other categories can be tailored more specifically.
 
-current-version: '3.8.0'
+current-version: '3.9.0'
 
 features:
   variance:
+    experimentalReleaseVersion: '3.8.0'
     help: "Sound variance"
 
   const-functions:
+    experimentalReleaseVersion: '3.8.0'
     help: "Allow more of the Dart language to be executed in const expressions."
 
   macros:
@@ -143,12 +145,15 @@ features:
     help: "Augmentations - enhancing declarations from outside"
 
   inference-update-4:
+    experimentalReleaseVersion: '3.8.0'
     help: "A bundle of updates to type inference."
 
   dot-shorthands:
+    experimentalReleaseVersion: '3.8.0'
     help: "Shorter dot syntax for static accesses."
 
   getter-setter-error:
+    experimentalReleaseVersion: '3.8.0'
     help: "Stop reporting errors about mismatching types in a getter/setter pair."
 
   sound-flow-analysis: