diff --git a/.github/workflows/pr_build.yml b/.github/workflows/pr_build.yml
index 8e2a9fa0..04e0965f 100644
--- a/.github/workflows/pr_build.yml
+++ b/.github/workflows/pr_build.yml
@@ -26,8 +26,11 @@ jobs:
       - name: Build Book
         run: bundle exec rake book:build
 
+      - name: Validate Book
+        run: bundle exec rake book:check
+
       - name: 'Save Artifacts'
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v6
         with:
           name: Build Artifacts
           path: |
@@ -38,4 +41,4 @@ jobs:
             progit.mobi
             progit.pdf
             progit.html
-          retention-days: 5
+          retention-days: 7
diff --git a/Gemfile b/Gemfile
index 2d04b6f8..0893f08a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,18 +1,18 @@
 source 'https://rubygems.org'
 
-gem 'rake', '13.1.0'
+gem 'rake', '13.2.1'
 gem 'asciidoctor', '2.0.22'
 
-gem 'json', '2.6.3'
+gem 'json', '2.9.1'
 gem 'awesome_print', '1.9.2'
 
 gem 'asciidoctor-fb2', '0.7.0'
-gem 'asciidoctor-epub3', '2.1.0'
-gem 'asciidoctor-pdf', '2.3.15'
+gem 'asciidoctor-epub3', '2.1.3'
+gem 'asciidoctor-pdf', '2.3.17'
 
 gem 'coderay', '1.1.3'
 gem 'pygments.rb', '2.4.1'
 gem 'thread_safe', '0.3.6'
-gem 'epubcheck-ruby', '5.1.0.0'
-gem 'html-proofer', '5.0.8'
+gem 'epubcheck-ruby', '5.2.0.0'
+gem 'html-proofer', '5.0.9'
 gem 'kindlegen', '3.1.1'