diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 1fb53ba..66f0127 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -19,8 +19,8 @@ updates:
     directory: /
     schedule:
       interval: daily
+    # Only `default-days`: the `semver-*-days` keys are rejected for the
+    # github-actions ecosystem, and one rejected key invalidates the whole file,
+    # which disables version updates for the entire repo.
     cooldown:
       default-days: 3
-      semver-major-days: 7
-      semver-minor-days: 3
-      semver-patch-days: 1