diff --git a/docker-build-push/update.sh b/docker-build-push/update.sh
index 2e8e205..6f7d76d 100755
--- a/docker-build-push/update.sh
+++ b/docker-build-push/update.sh
@@ -17,7 +17,20 @@ set -euo pipefail
 : "${INPUT_REMOTE_DOCKER_SSH_PORT:-22}"
 : "${INPUT_REMOTE_DOCKER_SSH_USERNAME:?missing INPUT_REMOTE_DOCKER_SSH_USERNAME}"
 : "${INPUT_REMOTE_DOCKER_SSH_KEY:?missing INPUT_REMOTE_DOCKER_SSH_KEY}"
-echo "Dummy Update step, pretend to ssh into remote Docker host" "$INPUT_REMOTE_DOCKER_SSH_USERNAME"@"$INPUT_REMOTE_DOCKER_SSH_HOST"\:"$INPUT_REMOTE_DOCKER_SSH_PORT" 
+
+keyfile="$(mktemp)"
+knownhosts="$(mktemp)"
+trap 'rm -f "$keyfile" "$knownhosts"' EXIT
+printf '%s\n' "$INPUT_REMOTE_DOCKER_SSH_KEY" > "$keyfile"
+chmod 600 "$keyfile"
+
+ssh -i "$keyfile" \
+	-p "${INPUT_REMOTE_DOCKER_SSH_PORT}" \
+	-o BatchMode=yes \
+	-o IdentitiesOnly=yes \
+	-o StrictHostKeyChecking=no \
+	-o UserKnownHostsFile=/dev/null \
+	-T "${INPUT_REMOTE_DOCKER_SSH_USERNAME}@${INPUT_REMOTE_DOCKER_SSH_HOST}"