diff --git a/Tiltfile b/Tiltfile
index a154db3..61aaa47 100644
--- a/Tiltfile
+++ b/Tiltfile
@@ -14,7 +14,7 @@ def deploy_cert_manager_if_needed():
 docker_build(
     ref='helper',
     context='.',
-    build_args={'GO_VERSION': '1.20'},
+    build_args={'GO_VERSION': '1.21'},
     dockerfile_contents='''
 ARG GO_VERSION
 FROM golang:${GO_VERSION}