diff --git a/.github/workflows/ci_versions.yml b/.github/workflows/ci_versions.yml
index 6efb123..22b6a46 100644
--- a/.github/workflows/ci_versions.yml
+++ b/.github/workflows/ci_versions.yml
@@ -1,6 +1,8 @@
 name: Test across versions
 
 on:
+  schedule:
+    - cron: "1 1 15 */1 *"  # Run once a month to test...
   push:
     branches: [ master, development, experimental, test* ]
   pull_request:
@@ -14,7 +16,7 @@ jobs:
       fail-fast: false
       matrix:
         python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
-        runs-on: [ubuntu-latest, macos-latest, ubuntu-24.04 ]
+        runs-on: [ubuntu-latest, macos-latest ]
         exclude:
           - runs-on: macos-latest
             python-version: ["3.9"]