diff --git a/.github/workflows/test-check-if-latest-lts-release.yml b/.github/workflows/test-check-if-latest-lts-release.yml
index 98c00df..8785fca 100644
--- a/.github/workflows/test-check-if-latest-lts-release.yml
+++ b/.github/workflows/test-check-if-latest-lts-release.yml
@@ -24,11 +24,11 @@ jobs:
         with:
           hz_version: 5.5.0
 
-      - name: Run check-if-latest-lts-release 5.5.8
-        id: check-if-latest-lts-release-5_5_8
+      - name: Run check-if-latest-lts-release 5.5.9
+        id: check-if-latest-lts-release-5_5_9
         uses: ./docker-actions/check-if-latest-lts-release
         with:
-          hz_version: 5.5.8
+          hz_version: 5.5.9
 
       - name: Run check-if-latest-lts-release 5.6.0
         id: check-if-latest-lts-release-5_6_0
@@ -51,7 +51,7 @@ jobs:
           }
 
           assert_equals "false" "${{ steps.check-if-latest-lts-release-5_5_0.outputs.is_latest_lts }}"
-          assert_equals "true" "${{ steps.check-if-latest-lts-release-5_5_8.outputs.is_latest_lts }}"
+          assert_equals "true" "${{ steps.check-if-latest-lts-release-5_5_9.outputs.is_latest_lts }}"
           assert_equals "false" "${{ steps.check-if-latest-lts-release-5_6_0.outputs.is_latest_lts }}"
 
           assert_eq 0 "$TESTS_RESULT" "All tests should pass"
diff --git a/.github/workflows/test-verify-docker-reproducibility.yml b/.github/workflows/test-verify-docker-reproducibility.yml
new file mode 100644
index 0000000..2667c9c
--- /dev/null
+++ b/.github/workflows/test-verify-docker-reproducibility.yml
@@ -0,0 +1,20 @@
+name: Test verify-docker-reproducibility action
+
+on:
+  workflow_call:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Test scripts
+        run: ./verify-docker-reproducibility/test_scripts.sh
+
+      - name: Run verify-docker-reproducibility
+        uses: ./verify-docker-reproducibility
+        with:
+          dockerfile: verify-docker-reproducibility/test-data/reproducible.Dockerfile
+          extra-args: verify-docker-reproducibility/test-data
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index a272581..1508ca6 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -57,6 +57,9 @@ jobs:
     uses: ./.github/workflows/test-slack-notification.yml
     secrets: inherit
 
+  test-verify-docker-reproducibility:
+    uses: ./.github/workflows/test-verify-docker-reproducibility.yml
+
   assert-all-jobs-succeeded:
     runs-on: ubuntu-latest
     needs:
@@ -74,6 +77,7 @@ jobs:
       - test-resolve-editions
       - test-setup-maven-snapshot-internal
       - test-slack-notification
+      - test-verify-docker-reproducibility
     if: always()
     steps:
       - name: Check all jobs succeeded
diff --git a/verify-docker-reproducibility/action.yml b/verify-docker-reproducibility/action.yml
new file mode 100644
index 0000000..129ca19
--- /dev/null
+++ b/verify-docker-reproducibility/action.yml
@@ -0,0 +1,23 @@
+name: Verify Docker reproducibility
+description: Verifies Docker image build reproducibility by building twice and comparing layer digests
+
+inputs:
+  dockerfile:
+    description: Path to the Dockerfile
+    required: true
+  extra-args:
+    description: Extra arguments passed to docker buildx build (e.g. context path, --output flags)
+    required: false
+    default: ""
+
+runs:
+  using: "composite"
+  steps:
+    - shell: bash
+      run: |
+        ${GITHUB_ACTION_PATH}/verify-docker-reproducibility.sh \
+          "${DOCKERFILE}" \
+          ${EXTRA_ARGS}
+      env:
+        DOCKERFILE: ${{ inputs.dockerfile }}
+        EXTRA_ARGS: ${{ inputs.extra-args }}
diff --git a/verify-docker-reproducibility/test-data/non-reproducible.Dockerfile b/verify-docker-reproducibility/test-data/non-reproducible.Dockerfile
new file mode 100644
index 0000000..caeae7e
--- /dev/null
+++ b/verify-docker-reproducibility/test-data/non-reproducible.Dockerfile
@@ -0,0 +1,4 @@
+FROM alpine:3:20
+RUN echo "built-at: $(date +%s%N)" > /build-timestamp \
+  && sleep 1
+USER nobody
diff --git a/verify-docker-reproducibility/test-data/reproducible.Dockerfile b/verify-docker-reproducibility/test-data/reproducible.Dockerfile
new file mode 100644
index 0000000..e64422c
--- /dev/null
+++ b/verify-docker-reproducibility/test-data/reproducible.Dockerfile
@@ -0,0 +1,2 @@
+FROM alpine:3.20
+USER nobody
diff --git a/verify-docker-reproducibility/test_scripts.sh b/verify-docker-reproducibility/test_scripts.sh
new file mode 100755
index 0000000..deb6bf2
--- /dev/null
+++ b/verify-docker-reproducibility/test_scripts.sh
@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+
+SCRIPT_DIR="$(dirname "$(readlink -f "$0")")"
+
+find "$SCRIPT_DIR" -name "*_tests.sh" -print0 | xargs -0 -n1 bash
diff --git a/verify-docker-reproducibility/verify-docker-reproducibility.sh b/verify-docker-reproducibility/verify-docker-reproducibility.sh
new file mode 100755
index 0000000..450b35d
--- /dev/null
+++ b/verify-docker-reproducibility/verify-docker-reproducibility.sh
@@ -0,0 +1,115 @@
+#!/usr/bin/env bash
+
+set -o errexit -o nounset -o pipefail ${RUNNER_DEBUG:+-x}
+
+# shellcheck source=../.github/scripts/logging.functions.sh
+source .github/scripts/logging.functions.sh
+
+readonly RANDOM_SUFFIX="$(head -c 8 /dev/urandom | od -An -tx1 | tr -d ' \n')"
+readonly TAG_A="repro-check-a-${RANDOM_SUFFIX}"
+readonly TAG_B="repro-check-b-${RANDOM_SUFFIX}"
+
+cleanup() {
+    docker rmi "${TAG_A}" "${TAG_B}" 2>/dev/null
+    return 0
+}
+trap cleanup EXIT
+
+if [[ "$#" -lt 1 ]]; then
+    echo "Verifies Docker image build reproducibility by building twice and comparing layer digests."
+    echo "Exits 0 if all layers are identical across both builds, 1 if any differ."
+    echo ""
+    echo "Usage: $0 <dockerfile> [extra buildx build args...]"
+    echo ""
+    echo "Examples:"
+    echo "   $0 hazelcast-oss/Dockerfile hazelcast-oss/"
+    echo "   $0 hazelcast-oss/Dockerfile --output type=docker,rewrite-timestamp=true hazelcast-oss/"
+    exit 1
+fi
+readonly dockerfile="${1:?Error: <dockerfile> is required}"
+shift
+
+# Add --load if user didn't provide --output
+load_flag="--load"
+for arg in "$@"; do
+    case "${arg}" in
+        --output|--output=*) load_flag="" ;;
+        *) ;;
+    esac
+done
+
+build_image() {
+    local tag="$1"
+    shift
+    echo "==> Building image '${tag}'..."
+    docker buildx build \
+        --no-cache \
+        ${load_flag} \
+        -f "${dockerfile}" \
+        -t "${tag}" \
+        "$@"
+    return $?
+}
+
+get_layers() {
+    local tag="$1"
+    docker inspect --format '{{json .RootFS.Layers}}' "${tag}"
+    return $?
+}
+
+get_digest() {
+    local layers="$1"
+    local index="$2"
+    echo "${layers}" | jq --raw-output ".[${index}] // empty"
+    return $?
+}
+
+build_image "${TAG_A}" "$@"
+echo ""
+build_image "${TAG_B}" "$@"
+echo ""
+
+layers_a=$(get_layers "${TAG_A}")
+layers_b=$(get_layers "${TAG_B}")
+
+layer_count_a=$(echo "${layers_a}" | jq 'length')
+layer_count_b=$(echo "${layers_b}" | jq 'length')
+
+echo "=== Layer Reproducibility Report ==="
+echo ""
+
+if [[ "${layer_count_a}" -ne "${layer_count_b}" ]]; then
+    echowarning "WARNING: Layer count mismatch (${layer_count_a} vs ${layer_count_b})"
+    echo ""
+fi
+
+layer_max_count=$(( layer_count_a > layer_count_b ? layer_count_a : layer_count_b ))
+has_diff=false
+for layerIndex in $(seq 0 $((layer_max_count - 1))); do
+    layer_digest_a=$(get_digest "${layers_a}" "${layerIndex}")
+    layer_digest_b=$(get_digest "${layers_b}" "${layerIndex}")
+    if [[ -z "${layer_digest_a}" ]]; then
+        echo "  Layer $((layerIndex + 1))/${layer_max_count}: ONLY IN B"
+        echo "    B: ${layer_digest_b}"
+        has_diff=true
+    elif [[ -z "${layer_digest_b}" ]]; then
+        echo "  Layer $((layerIndex + 1))/${layer_max_count}: ONLY IN A"
+        echo "    A: ${layer_digest_a}"
+        has_diff=true
+    elif [[ "${layer_digest_a}" == "${layer_digest_b}" ]]; then
+        echo "  Layer $((layerIndex + 1))/${layer_max_count}: MATCH"
+    else
+        echo "  Layer $((layerIndex + 1))/${layer_max_count}: DIFFER"
+        echo "    A: ${layer_digest_a}"
+        echo "    B: ${layer_digest_b}"
+        has_diff=true
+    fi
+done
+
+echo ""
+if [[ "${has_diff}" == "true" ]]; then
+    echoerr "RESULT: FAIL - some layers differ between builds"
+    exit 1
+fi
+
+echo "RESULT: PASS - all ${layer_count_a} layers are identical"
diff --git a/verify-docker-reproducibility/verify-docker-reproducibility_tests.sh b/verify-docker-reproducibility/verify-docker-reproducibility_tests.sh
new file mode 100755
index 0000000..7702d6e
--- /dev/null
+++ b/verify-docker-reproducibility/verify-docker-reproducibility_tests.sh
@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+
+set -eu ${RUNNER_DEBUG:+-x}
+
+SCRIPT_DIR="$(dirname "$(readlink -f "$0")")"
+
+# Source the latest version of assert.sh unit testing library and include in current shell
+source /dev/stdin <<< "$(curl --silent https://raw.githubusercontent.com/hazelcast/assert.sh/main/assert.sh)"
+
+TESTS_RESULT=0
+
+log_header "Tests for verify-docker-reproducibility"
+
+log_header "Should exit 1 when no arguments provided"
+"$SCRIPT_DIR"/verify-docker-reproducibility.sh && true
+actual_exit_code=$?
+assert_eq 1 "$actual_exit_code" "Should exit 1 when no args given" && log_success "Exits 1 with no args" || TESTS_RESULT=$?
+
+log_header "Should pass for a reproducible image"
+"$SCRIPT_DIR"/verify-docker-reproducibility.sh "$SCRIPT_DIR/test-data/reproducible.Dockerfile" "$SCRIPT_DIR/test-data" && true
+actual_exit_code=$?
+assert_eq 0 "$actual_exit_code" "Should exit 0 for reproducible build" && log_success "Reproducible build passes" || TESTS_RESULT=$?
+
+log_header "Should fail for a non-reproducible image"
+"$SCRIPT_DIR"/verify-docker-reproducibility.sh "$SCRIPT_DIR/test-data/non-reproducible.Dockerfile" "$SCRIPT_DIR/test-data" && true
+actual_exit_code=$?
+assert_eq 1 "$actual_exit_code" "Should exit 1 for non-reproducible build" && log_success "Non-reproducible build fails" || TESTS_RESULT=$?
+
+assert_eq 0 "$TESTS_RESULT" "All tests should pass"