diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index f3c97a4d6..85b5ffb61 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -36,7 +36,7 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 2.7.3
+          ruby-version: 2.7.4
       - name: Increase MySQL max_allowed_packet to 1GB (workaround for unknown/missing service option)
         run: |
           sudo apt-get install -y mysql-client
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 3c5cf7975..47d1d81a2 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,5 +1,5 @@
 default:
-  image: registry.znuny.com/docker/zammad-ci:2.7.3
+  image: registry.znuny.com/docker/zammad-ci:2.7.4
 
 include:
   - local: '/.gitlab/ci/base.yml'
@@ -43,9 +43,9 @@ variables:
 # Cache gems in between jobs and pipelines
 # ATTENTION: We use a combination of the Ruby major and minor version number
 # as a key for the cache to avoid cache growth and incompatibilities between
-# the gems. Search hook: 2.7.3 (change it when updating the Ruby version too)
+# the gems. Search hook: 2.7.4 (change it when updating the Ruby version too)
 cache:
-  key: "centos7ruby273"
+  key: "centos7ruby274"
   paths:
     - vendor/ruby
     # ATTENTION: This should be a dedicated cache only used in the job "TODO".
diff --git a/.ruby-version b/.ruby-version
index 2c9b4ef42..a4dd9dba4 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.7.3
+2.7.4
diff --git a/Gemfile b/Gemfile
index 36d64d439..aefd16123 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,7 @@
 source 'https://rubygems.org'
 
 # core - base
-ruby '2.7.3'
+ruby '2.7.4'
 gem 'rails', '6.0.4'
 
 # core - rails additions
diff --git a/Gemfile.lock b/Gemfile.lock
index 5a7f4306b..9a36dd0a2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -757,7 +757,7 @@ DEPENDENCIES
   zendesk_api
 
 RUBY VERSION
-   ruby 2.7.3p183
+   ruby 2.7.4p191
 
 BUNDLED WITH
    2.2.20