diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9daae4b..0edfe8c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [v5.0.5-4] - 2024-01-24
+### Fixed
+- Add bigdecimal bundle as a dependency of the `helpdesk` plugin
+
 ## [v5.0.5-3] - 2024-01-17
 ### Fixed
 - [#123] Add gem `bigdecimal` because some plugins like `helpdesk` need the dependency on `bundle install` if redmine is starting up.
diff --git a/Dockerfile b/Dockerfile
index 243a0e9..7e2e27b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,7 +2,7 @@
 FROM registry.cloudogu.com/official/base:3.17.3-2
 
 LABEL NAME="official/redmine" \
-   VERSION="5.0.5-3" \
+   VERSION="5.0.5-4" \
    maintainer="hello@cloudogu.com"
 
 ENV USER=redmine \
@@ -132,7 +132,8 @@ RUN set -eux -o pipefail \
  && bundle config set --local without 'development test' \
  && bundle install \
  && gem install puma \
- && gem install bigdecimal \
+ && gem install bigdecimal -v 3.1.5 \
+ && bundle add bigdecimal --version=3.1.5 \
  # cleanup
  && gem cleanup all \
  && rm -rf /root/* /tmp/* $(gem env gemdir)/cache \
diff --git a/dogu.json b/dogu.json
index 8db4e98..e8f3789 100644
--- a/dogu.json
+++ b/dogu.json
@@ -1,6 +1,6 @@
 {
   "Name": "official/redmine",
-  "Version": "5.0.5-3",
+  "Version": "5.0.5-4",
   "DisplayName": "Redmine",
   "Description": "Redmine is a flexible project management web application",
   "Category": "Development Apps",