diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0889ec6a7f..33df484a17 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,6 +1,9 @@
 name: CI
 
 on:
+  # Run on Wednesday and Friday at 06:17 UTC.
+  schedule:
+    - cron: "17 6 * * 3,5"
   workflow_dispatch:
   pull_request:
     types:
diff --git a/.github/workflows/tests-cibw.yml b/.github/workflows/tests-cibw.yml
index f7bca76e77..4a3238e04e 100644
--- a/.github/workflows/tests-cibw.yml
+++ b/.github/workflows/tests-cibw.yml
@@ -1,6 +1,9 @@
 name: CIBW
 
 on:
+  # Run on Wednesday and Friday at 06:47 UTC.
+  schedule:
+    - cron: "47 6 * * 3,5"
   workflow_dispatch:
   pull_request:
     branches: