diff --git a/Gemfile b/Gemfile
index 9ad3774e190..117ec136379 100644
--- a/Gemfile
+++ b/Gemfile
@@ -37,6 +37,8 @@ gem 'activerecord-session_store', '~> 2.0.0'
 gem 'rails', '~> 6.1.4', '>= 6.1.4.6'
 gem 'responders', '~> 3.0'
 
+gem 'ffi', '~> 1.15'
+
 gem 'rdoc', '>= 2.4.2'
 
 gem 'doorkeeper', '~> 5.5.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 807c1c64e4a..faa2bee7996 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1018,6 +1018,7 @@ DEPENDENCIES
   factory_bot (~> 6.2.0)
   factory_bot_rails (~> 6.2.0)
   faker
+  ffi (~> 1.15)
   flamegraph
   fog-aws
   friendly_id (~> 5.4.0)
diff --git a/docker/dev/backend/Dockerfile b/docker/dev/backend/Dockerfile
index e972a747a35..bf24d5171a4 100644
--- a/docker/dev/backend/Dockerfile
+++ b/docker/dev/backend/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:3.0.3-buster as develop
+FROM ruby:3.0.3-bullseye as develop
 MAINTAINER operations@openproject.com
 
 ARG DEV_UID=1000
@@ -23,7 +23,7 @@ WORKDIR /home/$USER
 
 RUN apt-get update -qq && \
     DEBIAN_FRONTEND=noninteractive apt-get install -y \
-    postgresql-client
+    postgresql-client libffi7 libffi-dev
 
 COPY ./docker/dev/backend/scripts/setup /usr/sbin/setup
 COPY ./docker/dev/backend/scripts/run-app /usr/sbin/run-app