diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index ff8f8e4..9662c29 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -11,7 +11,7 @@ concurrency:
 jobs:
   ci:
     name: Check
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04  # TODO: use `ubuntu-latest` when python 3.7 is dropped
     strategy:
       fail-fast: false
       matrix: