diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index d02c14c..712ddb4 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -7,6 +7,12 @@ updates:
     open-pull-requests-limit: 5
     labels:
       - dependencies
+    ignore:
+      # Mypy 1.20+ no longer accepts Python 3.9 as a configured target.
+      # Remove this guard when Relay drops Python 3.9 support.
+      - dependency-name: mypy
+        versions:
+          - ">=1.20"
   - package-ecosystem: github-actions
     directory: /
     schedule: