diff --git a/Makefile b/Makefile
index fef6e03f8a..4f73e632d0 100644
--- a/Makefile
+++ b/Makefile
@@ -192,6 +192,10 @@ gen/test-tls:
-subj "/CN=localhost" \
-config pkg/rpc/testdata/tls.config
+.PHONY: gen/contributions
+gen/contributions:
+ ./hack/gen-contributions.sh
+
.PHONY: release
release: release/init release/docs
diff --git a/README.md b/README.md
index 14423d938f..10fd6821ca 100644
--- a/README.md
+++ b/README.md
@@ -79,31 +79,34 @@ We'd love you to join us! Please see the [Contributor Guide](https://pipecd.dev/
-
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diff --git a/hack/gen-contributions.sh b/hack/gen-contributions.sh
new file mode 100755
index 0000000000..bd9985b736
--- /dev/null
+++ b/hack/gen-contributions.sh
@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+
+# Copyright 2022 The PipeCD Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+echo "Updating the contributors list on README.md ..."
+
+LINE_NUM=$(($(grep -Fn "### Thanks to the contributors of PipeCD" README.md | cut -f1 -d ':')+1))
+head -n $LINE_NUM README.md >> README.md.tmp
+
+while read -r line
+do
+ cat <> README.md.tmp
+$line
+EOT
+done < <(gh api -XGET /repos/pipe-cd/pipecd/contributors -F per_page=100 | jq -r '.[] | "![](\"\(.avatar_url)\" "\\"\(.login)\\"")
"')
+
+mv README.md.tmp README.md
+
+echo "Successfully update the contributions list on README.md"