diff --git a/.github/workflows/test-windows.yml b/.github/workflows/test-windows.yml
index 65657f266..9b04b2bd7 100644
--- a/.github/workflows/test-windows.yml
+++ b/.github/workflows/test-windows.yml
@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.6", "3.7", "3.8", "pypy3"]
+        python-version: ["3.6", "3.7", "3.8", "3.9-dev", "pypy3"]
         architecture: ["x86", "x64"]
         include:
           - architecture: "x86"
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 6a99d09f2..65673b0a2 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -14,6 +14,7 @@ jobs:
         ]
         python-version: [
           "pypy3",
+          "3.9-dev",
           "3.8",
           "3.7",
           "3.6",