diff --git a/Dockerfile b/Dockerfile
index 6abceb7..d7f28aa 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -32,7 +32,7 @@ COPY update.sh /
 # should be a no-op if the FROM line is up-to-date
 RUN /update.sh stable 
 
-RUN /update.sh nightly
+RUN rustup install nightly && /update.sh nightly
 
 COPY entrypoint.sh /