diff --git a/CHANGELOG.md b/CHANGELOG.md
index f9a1c482..10566e5d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,4 @@
-## 1.23.8
+## 1.24.0
 
 * **Potentially breaking bug fix:** Members loaded through a nested `@import`
   are no longer ever accessible outside that nested context.
@@ -7,6 +7,11 @@
   the same name. The latter name now takes precedence over the former, as per
   the specification.
 
+### Dart API
+
+* `SassFormatException` now implements `SourceSpanFormatException` (and thus
+  `FormatException`).
+
 ## 1.23.7
 
 * No user-visible changes.
diff --git a/lib/src/exception.dart b/lib/src/exception.dart
index fea0d1b4..7b39494a 100644
--- a/lib/src/exception.dart
+++ b/lib/src/exception.dart
@@ -86,7 +86,8 @@ class SassRuntimeException extends SassException {
 }
 
 /// An exception thrown when Sass parsing has failed.
-class SassFormatException extends SassException {
+class SassFormatException extends SassException
+    implements SourceSpanFormatException {
   String get source => span.file.getText(0);
 
   int get offset => span.start.offset;
diff --git a/pubspec.yaml b/pubspec.yaml
index f12bc1cf..2dfa2894 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: sass
-version: 1.23.8-dev
+version: 1.24.0-dev
 description: A Sass implementation in Dart.
 author: Sass Team
 homepage: https://github.com/sass/dart-sass