diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e21d2e9..1db83b0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -46,7 +46,7 @@ jobs:
       matrix:
         # Add macos-latest and/or windows-latest if relevant for this package.
         os: [ubuntu-latest]
-        sdk: [3.1.0, dev]
+        sdk: [3.4, dev]
     steps:
       - uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29
       - uses: dart-lang/setup-dart@f0ead981b4d9a35b37f30d36160575d60931ec30
@@ -63,4 +63,4 @@ jobs:
         if: always() && steps.install.outcome == 'success'
       - name: Run Chrome tests - wasm
         run: dart test --platform chrome --compiler dart2wasm
-        if: always() && steps.install.outcome == 'success' && matrix.sdk == 'dev'
+        if: always() && steps.install.outcome == 'success'
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d4b8cf7..de5e172 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,4 @@
-## 1.19.0-wip
+## 1.19.0
 
 - Adds `shuffled` to `IterableExtension`.
 - Shuffle `IterableExtension.sample` results.
@@ -13,7 +13,7 @@
 - Deprecate `whereNotNull()` from `IterableNullableExtension`. Use `nonNulls`
   instead - this is an equivalent extension available in Dart core since
   version 3.0.
-- Require Dart `^3.1.0`
+- Require Dart `^3.4.0`
 
 ## 1.18.0
 
diff --git a/lib/src/canonicalized_map.dart b/lib/src/canonicalized_map.dart
index 4103843..3dc6e37 100644
--- a/lib/src/canonicalized_map.dart
+++ b/lib/src/canonicalized_map.dart
@@ -187,7 +187,7 @@ class CanonicalizedMap<C, K, V> implements Map<K, V> {
   String toString() => MapBase.mapToString(this);
 
   bool _isValidKey(Object? key) =>
-      (key is K) && (_isValidKeyFn == null || _isValidKeyFn!(key));
+      (key is K) && (_isValidKeyFn == null || _isValidKeyFn(key));
 
   /// Creates a `Map<K,V>` (with the original key values).
   /// See [toMapOfCanonicalKeys].
diff --git a/pubspec.yaml b/pubspec.yaml
index 7a92e22..faca734 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: collection
-version: 1.19.0-wip
+version: 1.19.0
 description: >-
   Collections and utilities functions and classes related to collections.
 repository: https://github.com/dart-lang/collection
@@ -9,7 +9,7 @@ topics:
  - collections
 
 environment:
-  sdk: ^3.1.0
+  sdk: ^3.4.0
 
 dev_dependencies:
   dart_flutter_team_lints: ^3.0.0