diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 405a96d..491829c 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -32,7 +32,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install ruff mypy
+          pip install ruff==0.0.285 mypy==1.5.1
 
       - name: List packages
         run: pip list