diff --git a/.github/workflows/deploy-service.yml b/.github/workflows/deploy-service.yml
index de67075..009f748 100644
--- a/.github/workflows/deploy-service.yml
+++ b/.github/workflows/deploy-service.yml
@@ -199,8 +199,15 @@ jobs:
           mkdir -p ~/.ssh
           chmod 700 ~/.ssh
 
-          printf '%s\n' "${DEPLOY_SSH_PRIVATE_KEY}" > ~/.ssh/id_ed25519
-          chmod 600 ~/.ssh/id_ed25519
+          # Save private key preserving exact formatting
+          # Use printf with %b to handle \n sequences, strip trailing whitespace issues
+          echo "${DEPLOY_SSH_PRIVATE_KEY}" | sed 's/\r//' > ~/.ssh/id_deploy
+          # Ensure file ends with a newline (required by OpenSSH)
+          echo "" >> ~/.ssh/id_deploy
+          chmod 600 ~/.ssh/id_deploy
+
+          # Validate key and show fingerprint for debugging
+          echo ">>> Private key type: $(ssh-keygen -l -f ~/.ssh/id_deploy 2>&1 || echo 'INVALID KEY')"
 
           if [ -n "${DEPLOY_SSH_KNOWN_HOSTS:-}" ]; then
             printf '%s\n' "${DEPLOY_SSH_KNOWN_HOSTS}" > ~/.ssh/known_hosts
@@ -219,7 +226,7 @@ jobs:
             echo "  HostName ${DEPLOY_HOST}"
             echo "  Port ${DEPLOY_PORT}"
             echo "  User ${DEPLOY_USER}"
-            echo "  IdentityFile ~/.ssh/id_ed25519"
+            echo "  IdentityFile ~/.ssh/id_deploy"
             echo "  UserKnownHostsFile ~/.ssh/known_hosts"
             echo "  StrictHostKeyChecking accept-new"
             echo "  ConnectTimeout 15"