diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 68f051f4..83da6599 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -31,7 +31,7 @@ jobs:
       id: extract-python
       run: |
         if [[ "${{ matrix.toxenv }}" =~ py[0-9]+ ]]; then
-          PYTHON_VERSION=$(echo "${{ matrix.toxenv }}" | grep -o 'py[0-9]\+' | sed 's/py/3./')
+          PYTHON_VERSION=$(echo "${{ matrix.toxenv }}" | sed -E 's/py([0-9])([0-9]+).*/\1.\2/')
         else
           # Default version
           PYTHON_VERSION=3.8