diff --git a/CHANGELOG.md b/CHANGELOG.md
index b09de7e8..00d844af 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+## 1.51.1
+
+* Fix an issue where source locations tracked through variable references could
+  potentially become incorrect.
+
 ## 1.51.0
 
 * **Potentially breaking change**: Change the order of maps returned by
diff --git a/lib/src/async_environment.dart b/lib/src/async_environment.dart
index 796883e2..a86c9f02 100644
--- a/lib/src/async_environment.dart
+++ b/lib/src/async_environment.dart
@@ -773,6 +773,7 @@ class AsyncEnvironment {
       for (var name in _variables.removeLast().keys) {
         _variableIndices.remove(name);
       }
+      _variableNodes.removeLast();
       for (var name in _functions.removeLast().keys) {
         _functionIndices.remove(name);
       }
diff --git a/lib/src/environment.dart b/lib/src/environment.dart
index 08574519..9869e129 100644
--- a/lib/src/environment.dart
+++ b/lib/src/environment.dart
@@ -5,7 +5,7 @@
 // DO NOT EDIT. This file was generated from async_environment.dart.
 // See tool/grind/synchronize.dart for details.
 //
-// Checksum: 6b97030ff074d0b39e027ea97ba5893d242b9d3d
+// Checksum: 88f81b417129a74e4eb776d518c8e019dbf2ec36
 //
 // ignore_for_file: unused_import
 
@@ -779,6 +779,7 @@ class Environment {
       for (var name in _variables.removeLast().keys) {
         _variableIndices.remove(name);
       }
+      _variableNodes.removeLast();
       for (var name in _functions.removeLast().keys) {
         _functionIndices.remove(name);
       }
diff --git a/pkg/sass_api/CHANGELOG.md b/pkg/sass_api/CHANGELOG.md
index 205ac9a3..a602c937 100644
--- a/pkg/sass_api/CHANGELOG.md
+++ b/pkg/sass_api/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 1.0.0-beta.44
+
+* No user-visible changes.
+
 ## 1.0.0-beta.43
 
 * No user-visible changes.
diff --git a/pkg/sass_api/pubspec.yaml b/pkg/sass_api/pubspec.yaml
index 612a4e92..697d971d 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: 1.0.0-beta.43
+version: 1.0.0-beta.44
 description: Additional APIs for Dart Sass.
 homepage: https://github.com/sass/dart-sass
 
@@ -10,7 +10,7 @@ environment:
   sdk: '>=2.12.0 <3.0.0'
 
 dependencies:
-  sass: 1.51.0
+  sass: 1.51.1
 
 dependency_overrides:
   sass: {path: ../..}
diff --git a/pubspec.yaml b/pubspec.yaml
index 8b50d8de..acd9134b 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: sass
-version: 1.51.0
+version: 1.51.1-dev
 description: A Sass implementation in Dart.
 homepage: https://github.com/sass/dart-sass