diff --git a/CHANGELOG.md b/CHANGELOG.md
index 90bb83c..305d3b3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@ Note: Breaking changes between versions are indicated by "💥".
 
 ## Unreleased
 
+- [Bugfix] Fix "Unable to resolve dependency" error during forum initialisation
 - [Feature] Add `settheme` command to easily assign a theme to a domain name
 - [Improvement] Modify nginx access logs to include request scheme and server name (plugin developers should use the "tutor" log format)
 - [Bugfix] Fix DNS resolution of restarted service
diff --git a/tutor/templates/build/forum/Dockerfile b/tutor/templates/build/forum/Dockerfile
index 2aae2d5..0cb2018 100644
--- a/tutor/templates/build/forum/Dockerfile
+++ b/tutor/templates/build/forum/Dockerfile
@@ -26,8 +26,6 @@ RUN ruby-build $RUBY_VERSION /openedx/ruby
 ENV PATH "/openedx/ruby/bin:$PATH"
 RUN gem install bundler -v $BUNDLER_VERSION
 RUN gem install rake -v $RAKE_VERSION
-# gem upgrade must come after bundler/rake install
-RUN gem install rubygems-update && update_rubygems
 
 # Install forum
 RUN git clone https://github.com/edx/cs_comments_service.git --branch open-release/ironwood.2 --depth 1 /openedx/cs_comments_service