diff --git a/.ci/make.sh b/.ci/make.sh
index 93b261fb9..db7f8fc99 100755
--- a/.ci/make.sh
+++ b/.ci/make.sh
@@ -148,7 +148,12 @@ if [[ "$CMD" == "assemble" ]]; then
 fi
 
 if [[ "$CMD" == "bump" ]]; then
-    echo "TODO"
+  docker run \
+    --rm -v $repo:/code/elasticsearch-py \
+    $product \
+    /bin/bash -c "python /code/elasticsearch-py/utils/bump-version.py $VERSION"
+
+  exit 0
 fi
 
 if [[ "$CMD" == "codegen" ]]; then
diff --git a/utils/bump-version.py b/utils/bump-version.py
new file mode 100644
index 000000000..5bf97b85d
--- /dev/null
+++ b/utils/bump-version.py
@@ -0,0 +1,75 @@
+#  Licensed to Elasticsearch B.V. under one or more contributor
+#  license agreements. See the NOTICE file distributed with
+#  this work for additional information regarding copyright
+#  ownership. Elasticsearch B.V. licenses this file to you 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.
+
+"""Command line tool which changes the branch to be
+ready to build and test the given Elastic stack version.
+"""
+
+import re
+import sys
+from pathlib import Path
+
+SOURCE_DIR = Path(__file__).absolute().parent.parent
+
+
+def find_and_replace(path, pattern, replace):
+    # Does a find and replace within a file path and complains
+    # if the given pattern isn't found in the file.
+    with open(path, "r") as f:
+        old_data = f.read()
+
+    if re.search(pattern, old_data, flags=re.MULTILINE) is None:
+        print(f"Didn't find the pattern {pattern!r} in {path!s}")
+        exit(1)
+
+    new_data = re.sub(pattern, replace, old_data, flags=re.MULTILINE)
+    with open(path, "w") as f:
+        f.truncate()
+        f.write(new_data)
+
+
+def main():
+    if len(sys.argv) != 2:
+        print("usage: utils/bump-version.py [stack version]")
+        exit(1)
+
+    stack_version = sys.argv[1]
+    try:
+        python_version = re.search(r"^([0-9][0-9\.]*[0-9]+)", stack_version).group(1)
+    except AttributeError:
+        print(f"Couldn't match the given stack version {stack_version!r}")
+        exit(1)
+
+    find_and_replace(
+        path=SOURCE_DIR / "elasticsearch/_version.py",
+        pattern=r"__versionstr__ = \"[0-9]+[0-9\.]*[0-9](?:\+dev)?\"",
+        replace=f'__versionstr__ = "{python_version}"',
+    )
+    find_and_replace(
+        path=SOURCE_DIR / ".ci/test-matrix.yml",
+        pattern=r"STACK_VERSION:\s+\- [0-9]+[0-9\.]*[0-9]-SNAPSHOT",
+        replace=f"STACK_VERSION:\n  - {stack_version}",
+    )
+    find_and_replace(
+        path=SOURCE_DIR / ".github/workflows/unified-release.yml",
+        pattern=r"stack_version: \['[0-9]+[0-9\.]*[0-9]-SNAPSHOT'\]",
+        replace=f"stack_version: ['{stack_version}']",
+    )
+
+
+if __name__ == "__main__":
+    main()