diff --git a/Dockerfile b/Dockerfile
index 888a3b1..b80ef55 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,7 +4,7 @@ RUN apk add --no-cache git build-base
 
 WORKDIR /app
 
-COPY Gemfile ./
+COPY Gemfile Gemfile.lock ./
 RUN bundle install
 
 COPY bbs.rb ./
diff --git a/Gemfile.lock b/Gemfile.lock
index 19ba628..a00e539 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,6 +1,6 @@
 GIT
   remote: https://git.teletype.hu/tools/rubbs.git
-  revision: 272e75bd6f90a235eeac684d412ceb04c146c926
+  revision: c01159dc2306ed9adda3b865346ae1f987649a67
   specs:
     bbs (0.1.0)
       artii (~> 2.1)