diff --git a/.mergify.yml b/.mergify.yml
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--- /dev/null
+++ b/.mergify.yml
@@ -0,0 +1,63 @@
+# [NOTE] This setting relies on "required status check":
+# https://docs.github.com/en/github/administering-a-repository/about-required-status-checks
+
+pull_request_rules:
+  - name: remove outdated reviews
+    conditions:
+      - base=master
+    actions:
+      dismiss_reviews: {}
+  - name: automatic squash-merge when CI passes
+    conditions:
+      - base=master
+      - "#approved-reviews-by>=1"
+      - label=ready-to-merge:squash
+      - label!=work-in-progress
+    actions:
+      merge:
+        method: squash
+  - name: automatic squash-merge when CI passes (@tkf)
+    conditions:
+      - base=master
+      - author=tkf
+      - label=ready-to-merge:squash
+      - label!=work-in-progress
+    actions:
+      merge:
+        method: squash
+  - name: automatic rebase-merge when CI passes
+    conditions:
+      - base=master
+      - "#approved-reviews-by>=1"
+      - label=ready-to-merge:rebase
+      - label!=work-in-progress
+    actions:
+      merge:
+        method: rebase
+  - name: automatic rebase-merge when CI passes (@tkf)
+    conditions:
+      - base=master
+      - author=tkf
+      - label=ready-to-merge:rebase
+      - label!=work-in-progress
+    actions:
+      merge:
+        method: rebase
+  - name: automatic merge when CI passes
+    conditions:
+      - base=master
+      - "#approved-reviews-by>=1"
+      - label=ready-to-merge:merge
+      - label!=work-in-progress
+    actions:
+      merge:
+        method: merge
+  - name: automatic merge when CI passes (@tkf)
+    conditions:
+      - base=master
+      - author=tkf
+      - label=ready-to-merge:merge
+      - label!=work-in-progress
+    actions:
+      merge:
+        method: merge