diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4367c87d..95855f55 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -2,6 +2,12 @@ name: CI
 
 on:
   pull_request:
+    # `edited` is required so the workflow re-fires when a PR's base ref is
+    # set back to `main` after a Graphite stack restack momentarily flips
+    # the base off of `main`. Without it, `pull_request` triggers are not
+    # re-evaluated on `base_ref_changed`, leaving required checks skipped
+    # for that head SHA forever.
+    types: [opened, synchronize, reopened, edited]
     branches: [main]
   push:
     branches: [main]
diff --git a/.github/workflows/windows-render.yml b/.github/workflows/windows-render.yml
index 01c17897..2e7de5f2 100644
--- a/.github/workflows/windows-render.yml
+++ b/.github/workflows/windows-render.yml
@@ -8,6 +8,12 @@ name: Windows render verification
 
 on:
   pull_request:
+    # `edited` is required so the workflow re-fires when a PR's base ref is
+    # set back to `main` after a Graphite stack restack momentarily flips
+    # the base off of `main`. Without it, `pull_request` triggers are not
+    # re-evaluated on `base_ref_changed`, leaving required checks skipped
+    # for that head SHA forever.
+    types: [opened, synchronize, reopened, edited]
     branches: [main]
   push:
     branches: [main]