diff --git a/.github/workflows/sphinx_build.yml b/.github/workflows/sphinx_build.yml
index 6065d570..814690c3 100644
--- a/.github/workflows/sphinx_build.yml
+++ b/.github/workflows/sphinx_build.yml
@@ -1,4 +1,6 @@
 name: Sphinx docs to gh-pages
+env:
+  PYTHON_VERSION: "3.10"
 
 on:
   pull_request: