diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 71cecde..2f941bc 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -18,7 +18,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-        - python-version: '3.13'  # Keep in sync with .readthedocs.yml
+        - python-version: '3.12'  # Keep in sync with .readthedocs.yml
           env:
             TOXENV: docs
         - python-version: '3.13'
diff --git a/.readthedocs.yml b/.readthedocs.yml
index 86fb9a1..fbe8493 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -6,7 +6,7 @@ sphinx:
 build:
   os: ubuntu-22.04
   tools:
-    python: "3.13"  # Keep in sync with .github/workflows/main.yml
+    python: "3.12"  # Keep in sync with .github/workflows/main.yml
 
 python:
   install: