diff --git a/tests/buildkite/test-macos-m1-clang11.sh b/tests/buildkite/test-macos-m1-clang11.sh
index 97b4fef93..401701b42 100755
--- a/tests/buildkite/test-macos-m1-clang11.sh
+++ b/tests/buildkite/test-macos-m1-clang11.sh
@@ -24,6 +24,20 @@ popd
 rm -rf build
 set +x
 
+echo "--- Upload Python wheel"
+set -x
+pushd lib
+mv -v libxgboost4j.dylib libxgboost4j_m1_${BUILDKITE_COMMIT}.dylib
+buildkite-agent artifact upload libxgboost4j_m1_${BUILDKITE_COMMIT}.dylib
+if [[ ($is_pull_request == 0) && ($is_release_branch == 1) ]]
+then
+  aws s3 cp libxgboost4j_m1_${BUILDKITE_COMMIT}.dylib \
+    s3://xgboost-nightly-builds/${BRANCH_NAME}/libxgboost4j/ \
+    --acl public-read --no-progress
+fi
+popd
+set +x
+
 # Ensure that XGBoost can be built with Clang 11
 echo "--- Build and Test XGBoost with MacOS M1, Clang 11"
 set -x