diff --git a/CHANGELOG.md b/CHANGELOG.md
index 14900de80..566d20f85 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 1.54.9
+
+* Fix an incorrect span in certain `@media` query deprecation warnings.
+
 ## 1.54.8
 
 * No user-visible changes.
diff --git a/lib/src/parse/stylesheet.dart b/lib/src/parse/stylesheet.dart
index 5398bb885..f4dc5ca20 100644
--- a/lib/src/parse/stylesheet.dart
+++ b/lib/src/parse/stylesheet.dart
@@ -2713,8 +2713,9 @@ abstract class StylesheetParser extends Parser {
             invocation, identifier.span.expand(invocation.span));
       } else if (plain == "not") {
         whitespace();
-        return UnaryOperationExpression(
-            UnaryOperator.not, _singleExpression(), identifier.span);
+        var expression = _singleExpression();
+        return UnaryOperationExpression(UnaryOperator.not, expression,
+            identifier.span.expand(expression.span));
       }
 
       lower = plain.toLowerCase();
diff --git a/pkg/sass_api/CHANGELOG.md b/pkg/sass_api/CHANGELOG.md
index 032731a7f..bbcab2bb6 100644
--- a/pkg/sass_api/CHANGELOG.md
+++ b/pkg/sass_api/CHANGELOG.md
@@ -1,3 +1,8 @@
+## 3.0.4
+
+* `UnaryOperationExpression`s with operator `not` now include a correct span,
+  covering the expression itself instead of just the operator.
+
 ## 3.0.3
 
 * No user-visible changes.
diff --git a/pkg/sass_api/pubspec.yaml b/pkg/sass_api/pubspec.yaml
index ffd2b3ae6..bf8ff8e8d 100644
--- a/pkg/sass_api/pubspec.yaml
+++ b/pkg/sass_api/pubspec.yaml
@@ -2,7 +2,7 @@ name: sass_api
 # Note: Every time we add a new Sass AST node, we need to bump the *major*
 # version because it's a breaking change for anyone who's implementing the
 # visitor interface(s).
-version: 3.0.3
+version: 3.0.4
 description: Additional APIs for Dart Sass.
 homepage: https://github.com/sass/dart-sass
 
@@ -10,7 +10,7 @@ environment:
   sdk: ">=2.17.0 <3.0.0"
 
 dependencies:
-  sass: 1.54.8
+  sass: 1.54.9
 
 dev_dependencies:
   dartdoc: ^5.0.0
diff --git a/pubspec.yaml b/pubspec.yaml
index a292405b6..48484ab97 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: sass
-version: 1.54.8
+version: 1.54.9
 description: A Sass implementation in Dart.
 homepage: https://github.com/sass/dart-sass