diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 7f8dd00..0fb49b8 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -25,17 +25,22 @@ jobs:
 
   test:
     name: Python ${{ matrix.python }}
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
 
     strategy:
       matrix:
+        os:
+          - "ubuntu-latest"
         python:
-          - "3.6"
           - "3.7"
           - "3.8"
           - "3.9"
           - "3.10"
-          - "pypy-3.6"
+        include:
+          - os: "ubuntu-20.04"
+            python: "3.6"
+          - os: "ubuntu-20.04"
+            python: "pypy-3.6"
 
     steps:
       - uses: actions/checkout@v3
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 9a2251a..ea0857c 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -9,7 +9,7 @@ repos:
     hooks:
       - id: flake8
   - repo: https://github.com/pycqa/isort
-    rev: 5.9.1
+    rev: 5.12.0
     hooks:
       - id: isort
   - repo: https://github.com/pre-commit/mirrors-mypy