diff --git a/tests/multiple-ports/Dockerfile b/tests/multiple-ports/Dockerfile
index 024380e..2860222 100644
--- a/tests/multiple-ports/Dockerfile
+++ b/tests/multiple-ports/Dockerfile
@@ -1,4 +1,4 @@
-FROM golang:1.20.5-alpine
+FROM golang:1.21.0-alpine
 
 CMD ["multiple-ports"]
 EXPOSE 80 443