diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index c9a56e88..4f93980a 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -8,6 +8,9 @@ on:
     branches:
       - main
 
+env:
+  UV_FROZEN: "1"
+
 jobs:
   lint:
     runs-on: ubuntu-latest
diff --git a/Makefile b/Makefile
index f6b779e3..accf2d91 100644
--- a/Makefile
+++ b/Makefile
@@ -37,7 +37,6 @@ snapshots-create:
 .PHONY: old_version_tests
 old_version_tests: 
 	UV_PROJECT_ENVIRONMENT=.venv_39 uv run --python 3.9 -m pytest
-	UV_PROJECT_ENVIRONMENT=.venv_39 uv run --python 3.9 -m mypy .
 
 .PHONY: build-docs
 build-docs: