diff --git a/pubspec.yaml b/pubspec.yaml
index ddd391a..f3d9e46 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -14,7 +14,7 @@ environment:
 
 dependencies:
   collection: ^1.18.0
-  equatable: ^2.1.0
+  equatable: ">=2.1.0 <4.0.0"
   meta: ^1.9.1
 
 dev_dependencies: