diff --git a/.github/workflows/test-cygwin.yml b/.github/workflows/test-cygwin.yml
index c85876ad1..5597b2b34 100644
--- a/.github/workflows/test-cygwin.yml
+++ b/.github/workflows/test-cygwin.yml
@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-minor-version: [7, 8]
+        python-minor-version: [7, 8, 9]
         architecture: ["x86", "x86_64"]
 
     timeout-minutes: 40
diff --git a/docs/installation.rst b/docs/installation.rst
index e5f09dad4..f2c08488f 100644
--- a/docs/installation.rst
+++ b/docs/installation.rst
@@ -478,9 +478,9 @@ These platforms are built and tested for every change.
 +----------------------------------+----------------------------+---------------------+
 | Windows Server 2019              | 3.7, 3.8, 3.9, 3.10, PyPy3 | x86, x86-64         |
 |                                  +----------------------------+---------------------+
-|                                  | 3.9/MinGW                  | x86, x86-64         |
+|                                  | 3.9 (MinGW)                | x86, x86-64         |
 |                                  +----------------------------+---------------------+
-|                                  | 3.8/Cygwin                 | x86-64              |
+|                                  | 3.7, 3.8, 3.9 (Cygwin)     | x86, x86-64         |
 +----------------------------------+----------------------------+---------------------+