diff --git a/Dockerfile b/Dockerfile
index 56a50d6..9590ef9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -34,7 +34,7 @@ RUN gem install --no-document bundler
 ENV RAILS_ENV production
 ENV NODE_ENV production
 
-ARG VERSION=4.1.9
+ARG VERSION=4.2.0
 
 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' && \