diff --git a/vendor/golang.org/x/net/http2/Dockerfile b/vendor/golang.org/x/net/http2/Dockerfile
index 53fc52579..887a1f26e 100644
--- a/vendor/golang.org/x/net/http2/Dockerfile
+++ b/vendor/golang.org/x/net/http2/Dockerfile
@@ -6,7 +6,7 @@
 # Go tests use this curl binary for integration tests.
 #
 
-FROM ubuntu:trusty
+FROM ubuntu:trusty-20190515
 
 RUN apt-get update && \
     apt-get upgrade -y && \