diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fd42e093..fa0f48ea 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -2,14 +2,12 @@
 
 name: ci
 
-# We want to run CI on all pull requests. Additionally, Bors needs workflows to
-# run on the `staging` and `trying` branches.
+# We want to run CI on all pull requests. Additionally, GitHub actions merge
+# queue needs workflows to run on the `merge_queue` trigger to block merges on
+# them.
 on:
   pull_request:
-  push:
-    branches:
-      - staging
-      - trying
+  merge_group:
 
 jobs:
   ci:
diff --git a/.github/workflows/mac-os.yml b/.github/workflows/mac-os.yml
index 3116069a..f4e785cb 100644
--- a/.github/workflows/mac-os.yml
+++ b/.github/workflows/mac-os.yml
@@ -2,8 +2,9 @@
 
 name: ci-mac-os
 
-# We run this workflow during pull request review, but not for Bors merges. We
-# can change this if the workflow is reasonably quick and reliable.
+# We run this workflow during pull request review, but not as a required status
+# for GitHub actions merge-queue merges. We can change this if the workflow is
+# reasonably quick and reliable.
 on: pull_request
 
 jobs:
diff --git a/.github/workflows/size-diff.yml b/.github/workflows/size-diff.yml
index 6989b392..b453a90b 100644
--- a/.github/workflows/size-diff.yml
+++ b/.github/workflows/size-diff.yml
@@ -3,14 +3,12 @@
 
 name: size-diff
 
-# We want to run this on all pull requests. Additionally, Bors needs workflows
-# to run on the `staging` and `trying` branches to block merges on them.
+# We want to run this on all pull requests. Additionally, GitHub actions merge
+# queue needs workflows to run on the `merge_queue` trigger to block merges on
+# them.
 on:
   pull_request:
-  push:
-    branches:
-      - staging
-      - trying
+  merge_group:
 
 jobs:
   size-diff:
diff --git a/bors.toml b/bors.toml
deleted file mode 100644
index 4b9b851b..00000000
--- a/bors.toml
+++ /dev/null
@@ -1,4 +0,0 @@
-status = [
-  "ci",
-  "size-diff",
-]