diff --git a/environment.yml b/environment.yml
index 5585d02..a823c81 100644
--- a/environment.yml
+++ b/environment.yml
@@ -2,4 +2,4 @@ channels:
   - conda-forge
   - nodefaults
 dependencies:
-  - mypy=1.8.0
+  - mypy=1.9.0