diff --git a/.github/workflows/linuxci.yml b/.github/workflows/linuxci.yml
index 14766a6..26589ca 100644
--- a/.github/workflows/linuxci.yml
+++ b/.github/workflows/linuxci.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9, pypy3]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "pypy-3.8"]
     name: Linux CI
     steps:
       - name: Check out source repository
diff --git a/.github/workflows/macosci.yml b/.github/workflows/macosci.yml
index 973da77..c19bd1f 100644
--- a/.github/workflows/macosci.yml
+++ b/.github/workflows/macosci.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: macos-latest
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9, pypy3]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "pypy-3.8"]
     name: macOS CI
     steps:
       - name: Check out source repository
diff --git a/.github/workflows/windowsci.yml b/.github/workflows/windowsci.yml
index a11eb96..3c995e2 100644
--- a/.github/workflows/windowsci.yml
+++ b/.github/workflows/windowsci.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: windows-latest
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9, pypy3]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "pypy-3.8"]
     name: Windows CI
     steps:
       - name: Check out source repository