diff --git a/cluster/images/Dockerfile b/cluster/images/Dockerfile
index 9fe609327..e2f98104a 100644
--- a/cluster/images/Dockerfile
+++ b/cluster/images/Dockerfile
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM alpine:3.21.2
+FROM alpine:3.21.3
 
 ARG BINARY
 
diff --git a/cluster/images/buildx.Dockerfile b/cluster/images/buildx.Dockerfile
index 70730a694..52cb48568 100644
--- a/cluster/images/buildx.Dockerfile
+++ b/cluster/images/buildx.Dockerfile
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM alpine:3.21.2
+FROM alpine:3.21.3
 
 ARG BINARY
 ARG TARGETPLATFORM