diff --git a/Dockerfile b/Dockerfile
index cf07188..ac62187 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -31,12 +31,12 @@ RUN mkdir -p /opt/postal/app /opt/postal/config
 WORKDIR /opt/postal/app
 
 # Install bundler
-RUN gem install bundler -v 2.4.9 --no-doc
+RUN gem install bundler -v 2.5.6 --no-doc
 
 # Install the latest and active gem dependencies and re-run
 # the appropriate commands to handle installs.
-COPY Gemfile Gemfile.lock ./
-RUN bundle config set force_ruby_platform true && bundle install -j 4
+COPY --chown=postal Gemfile Gemfile.lock ./
+RUN bundle install -j 6
 
 # Copy the application (and set permissions)
 COPY ./docker/wait-for.sh /docker-entrypoint.sh
diff --git a/Gemfile.lock b/Gemfile.lock
index d0e4868..64f8367 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -76,7 +76,6 @@ GEM
       activerecord (>= 6.1, < 8.0)
     autoprefixer-rails (10.4.13.0)
       execjs (~> 2)
-    base64 (0.2.0)
     bcrypt (3.1.20)
     bigdecimal (3.1.6)
     builder (3.2.4)
@@ -136,8 +135,6 @@ GEM
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
     json (2.6.3)
-    jwt (2.8.0)
-      base64
     kaminari (1.2.2)
       activesupport (>= 4.1.0)
       kaminari-actionview (= 1.2.2)
@@ -346,7 +343,6 @@ DEPENDENCIES
   hashie
   highline
   jquery-rails
-  jwt
   kaminari
   klogger-logger
   mail
@@ -372,4 +368,4 @@ DEPENDENCIES
   webmock
 
 BUNDLED WITH
-   2.4.9
+   2.5.6