diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 8aaf390..33926da 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -48,7 +48,7 @@ jobs:
         - python-version: "3.13"
           env:
             TOXENV: pre-commit
-        - python-version: "3.13"
+        - 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 f8c8dff..512eb77 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -9,7 +9,7 @@ build:
   tools:
     # For available versions, see:
     # https://docs.readthedocs.io/en/stable/config-file/v2.html#build-tools-python
-    python: "3.13"  # Keep in sync with .github/workflows/main.yml
+    python: "3.12"  # Keep in sync with .github/workflows/main.yml
 
 python:
   install: