diff --git a/example/regex_substituter_fixtures/pubspec.yaml b/example/regex_substituter_fixtures/pubspec.yaml
index c640b7b..baa2f00 100644
--- a/example/regex_substituter_fixtures/pubspec.yaml
+++ b/example/regex_substituter_fixtures/pubspec.yaml
@@ -5,4 +5,4 @@ version: 0.0.0
 dependencies:
   codemod: ^0.1.0
 environment:
-  sdk: '>=3.0.0 <4.0.0'
+  sdk: ^3.13.0