diff --git a/Dockerfile b/Dockerfile
index 74e8a47..fc70b2d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -29,7 +29,7 @@ RUN gem install --no-document bundler
 ENV RAILS_ENV production
 ENV NODE_ENV production
 
-ARG VERSION=3.5.5
+ARG VERSION=4.0.2
 
 RUN curl -L https://github.com/tootsuite/mastodon/archive/v${VERSION}.tar.gz | tar -xz --strip-components 1 -f - && \
     bundle config --local set deployment 'true' && \