diff --git a/Dockerfile.cuda b/Dockerfile.cuda
index 006949b..59d2eca 100644
--- a/Dockerfile.cuda
+++ b/Dockerfile.cuda
@@ -4,7 +4,7 @@ ARG FFMPEG_VERSION=5.0
 
 ##############################
 # Build the NGINX-build image.
-FROM ubuntu:18.04 as build-nginx
+FROM ubuntu:20.04 as build-nginx
 ARG NGINX_VERSION
 ARG NGINX_RTMP_VERSION
 ARG MAKEFLAGS="-j4"