diff --git a/Dockerfile b/Dockerfile
index 58791dc..d30df73 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -8,4 +8,4 @@ RUN gem install bundler
 RUN bundle config set without "development test"
 RUN bundle install --jobs=8
 ADD . /app
-CMD ["unicorn", "-c", "./config/unicorn.rb"]
+CMD ["bundle", "exec", "unicorn", "-c", "./config/unicorn.rb"]
diff --git a/docker-compose.yml b/docker-compose.yml
index 2ff5f77..086b4a9 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -5,7 +5,7 @@ services:
     volumes:
       - data:/var/lib/postgresql/data
   web:
-    command: unicorn -c config/unicorn.rb
+    command: bundle exec unicorn -c config/unicorn.rb
     entrypoint: bin/wait-for-it.sh db:5432 -s --
     environment:
       DATABASE_URL: postgres://postgres@db/postgres