diff --git a/.appveyor.yml b/.appveyor.yml
index 319793386..8919918fc 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -52,8 +52,8 @@ texlive-collection-latexrecommended,\
 texlive-collection-fontsrecommended,\
 texlive-collection-pictures,\
 xmlto,\
-python38-lxml,\
-python38-ply"
+python39-lxml,\
+python39-ply"
 
 build_script: >-
     %CYGWIN_ROOT%/bin/bash -lc "
diff --git a/.github/workflows/cygwin.yml b/.github/workflows/cygwin.yml
index 524a9a3b8..7e73a360f 100644
--- a/.github/workflows/cygwin.yml
+++ b/.github/workflows/cygwin.yml
@@ -87,8 +87,8 @@ jobs:
           mingw64-${{ matrix.pkgarch }}-zlib,
           patch,
           perl,
-          python38-lxml,
-          python38-ply,
+          python39-lxml,
+          python39-ply,
           texlive-collection-fontsrecommended,
           texlive-collection-latexrecommended,
           texlive-collection-pictures,