diff --git a/action.yml b/action.yml
index 0857b42..a1a08d0 100644
--- a/action.yml
+++ b/action.yml
@@ -48,6 +48,7 @@ runs:
         set -euo pipefail
         exec /opt/relay/relay run \
             --mode=proxy \
+            --port=5333 \
             --shutdown-timeout=2 \
             --upstream-dsn="\$SENTRY_DSN" \
             --aws-runtime-api="\$AWS_LAMBDA_RUNTIME_API"