diff --git a/CHANGELOG.md b/CHANGELOG.md
index 56468172f..922212dd0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,9 @@
 * Remove sourcemap comments from Sass sources. The generated sourcemap comment
   for the compiled CSS output remains unaffected.
 
+* Produce a better error message for a number with a leading `+` or `-`, a
+  decimal point, but no digits.
+
 ## 1.57.1
 
 * No user-visible changes.
diff --git a/lib/src/parse/stylesheet.dart b/lib/src/parse/stylesheet.dart
index 9236a652a..d0bc43dbc 100644
--- a/lib/src/parse/stylesheet.dart
+++ b/lib/src/parse/stylesheet.dart
@@ -2529,7 +2529,10 @@ abstract class StylesheetParser extends Parser {
     // Don't complain about a dot after a number unless the number starts with a
     // dot. We don't allow a plain ".", but we need to allow "1." so that
     // "1..." will work as a rest argument.
-    _tryDecimal(allowTrailingDot: scanner.position != start.position);
+    _tryDecimal(
+        allowTrailingDot: scanner.position != start.position &&
+            first != $plus &&
+            first != $minus);
     _tryExponent();
 
     // Use Dart's built-in double parsing so that we don't accumulate
diff --git a/pubspec.yaml b/pubspec.yaml
index 79a5b1dc2..2f702631c 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: sass
-version: 1.57.2
+version: 1.57.2-dev
 description: A Sass implementation in Dart.
 homepage: https://github.com/sass/dart-sass