diff --git a/.github/workflows/deploy-dev.yml b/.github/workflows/deploy-dev.yml
index 73c3b39..821547a 100644
--- a/.github/workflows/deploy-dev.yml
+++ b/.github/workflows/deploy-dev.yml
@@ -75,7 +75,7 @@ jobs:
         )
         
         # Generate HMAC signature for webhook security
-        SIGNATURE=$(echo -n "$PAYLOAD" | openssl dgst -sha256 -hmac "${{ secrets.WEBHOOK_SECRET }}" -binary | base64)
+        SIGNATURE=$(echo -n "$PAYLOAD" | openssl dgst -sha256 -hmac "${{ secrets.WEBHOOK_SECRET }}" | sed 's/^.* //')
         
         # Send webhook
         HTTP_CODE=$(curl -s -o /tmp/webhook_response.json -w "%{http_code}" \