diff --git a/pubspec.yaml b/pubspec.yaml
index 4a360a7..a4cf8fd 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -7,10 +7,10 @@ environment:
   sdk: '>=3.0.0 <4.0.0'
 
 dependencies:
-  characters: ^1.3.0
-  meta: ^1.9.1
-  intl: ^0.18.1
-  collection: ^1.17.1
+  characters: '>=1.3.0 <2.0.0'
+  meta: '>=1.9.0 <2.0.0'
+  intl: '>=0.18.0 <1.0.0'
+  collection: '>=1.17.1 <2.0.0'
 
 dev_dependencies:
   lints: ^2.1.0