diff --git a/testdata/project-v4/Dockerfile b/testdata/project-v4/Dockerfile
index c389c0981af..aa74435b63a 100644
--- a/testdata/project-v4/Dockerfile
+++ b/testdata/project-v4/Dockerfile
@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.20 as builder
+FROM golang:1.21 as builder
 ARG TARGETOS
 ARG TARGETARCH