diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b8bbc689..77d912e4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,7 +12,7 @@ jobs:
       - name: Install Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 4.0.1
+          ruby-version: 4.0.5
       - name: Cache gems
         uses: actions/cache@v4
         with:
@@ -37,7 +37,7 @@ jobs:
       - name: Install Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 4.0.1
+          ruby-version: 4.0.5
       - name: Cache gems
         uses: actions/cache@v4
         with:
@@ -89,7 +89,7 @@ jobs:
       - name: Install Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 4.0.1
+          ruby-version: 4.0.5
       - name: Cache gems
         uses: actions/cache@v4
         with:
@@ -132,7 +132,7 @@ jobs:
       - name: Install Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 4.0.1
+          ruby-version: 4.0.5
       - name: Set up Node
         uses: actions/setup-node@v1
         with:
diff --git a/Dockerfile b/Dockerfile
index 61a2269f..3f6bb3c6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:4.0.1-alpine AS download
+FROM ruby:4.0.5-alpine AS download
 
 WORKDIR /fonts
 
@@ -13,7 +13,7 @@ RUN apk --no-cache add wget && \
     mkdir -p /pdfium-linux && \
     tar -xzf pdfium-linux.tgz -C /pdfium-linux
 
-FROM ruby:4.0.1-alpine AS webpack
+FROM ruby:4.0.5-alpine AS webpack
 
 ENV RAILS_ENV=production
 ENV NODE_ENV=production
@@ -40,7 +40,7 @@ COPY ./app/views ./app/views
 
 RUN echo "gem 'shakapacker'" > Gemfile && ./bin/shakapacker
 
-FROM ruby:4.0.1-alpine AS app
+FROM ruby:4.0.5-alpine AS app
 
 ENV RAILS_ENV=production
 ENV BUNDLE_WITHOUT="development:test"
diff --git a/Gemfile b/Gemfile
index 4e2fd78e..7ed8fdeb 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@
 
 source 'https://rubygems.org'
 
-ruby '4.0.1'
+ruby '4.0.5'
 
 gem 'addressable'
 gem 'arabic-letter-connector', require: false
diff --git a/Gemfile.lock b/Gemfile.lock
index ce25e900..8d15dd29 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -662,7 +662,7 @@ DEPENDENCIES
   webmock
 
 RUBY VERSION
-  ruby 4.0.1
+  ruby 4.0.5
 
 BUNDLED WITH
   4.0.3