diff --git a/Gemfile.lock b/Gemfile.lock
index 475b85c..e89cbf4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -222,7 +222,6 @@ GEM
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.3.6)
-    mini_portile2 (2.8.5)
     minima (2.5.1)
       jekyll (>= 3.5, < 5.0)
       jekyll-feed (~> 0.9)
@@ -231,8 +230,9 @@ GEM
     mutex_m (0.2.0)
     net-http (0.4.1)
       uri
-    nokogiri (1.16.0)
-      mini_portile2 (~> 2.8.2)
+    nokogiri (1.16.0-arm64-darwin)
+      racc (~> 1.4)
+    nokogiri (1.16.0-x86_64-linux)
       racc (~> 1.4)
     octokit (4.25.1)
       faraday (>= 1, < 3)
@@ -276,6 +276,7 @@ GEM
     webrick (1.8.1)
 
 PLATFORMS
+  arm64-darwin-22
   x86_64-linux
 
 DEPENDENCIES
diff --git a/_data/sidebars/picoruby_sidebar.yml b/_data/sidebars/picoruby_sidebar.yml
index 634716e..1db23d6 100644
--- a/_data/sidebars/picoruby_sidebar.yml
+++ b/_data/sidebars/picoruby_sidebar.yml
@@ -4,15 +4,15 @@ entries:
   product: PicoRuby
   version: master
   folders:
-  - title: 
+  - title:
     output: pdf
     type: frontmatter
     folderitems:
-    - title: 
+    - title:
       url: "/titlepage.html"
       output: pdf
       type: frontmatter
-    - title: 
+    - title:
       url: "/tocpage.html"
       output: pdf
       type: frontmatter
diff --git a/lib/Gemfile.lock b/lib/Gemfile.lock
index 50269f1..23e7cfb 100644
--- a/lib/Gemfile.lock
+++ b/lib/Gemfile.lock
@@ -2,7 +2,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     abbrev (0.1.2)
-    activesupport (7.1.3)
+    activesupport (7.1.3.2)
       base64
       bigdecimal
       concurrent-ruby (~> 1.0, >= 1.0.2)
@@ -17,7 +17,7 @@ GEM
     bigdecimal (3.1.6)
     concurrent-ruby (1.2.3)
     connection_pool (2.4.1)
-    csv (3.2.9)
+    csv (3.2.8)
     drb (2.2.0)
       ruby2_keywords
     ffi (1.16.3)
@@ -30,9 +30,9 @@ GEM
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     logger (1.6.0)
-    minitest (5.21.2)
+    minitest (5.22.2)
     mutex_m (0.2.0)
-    parser (3.3.0.4)
+    parser (3.3.0.5)
       ast (~> 2.4.1)
       racc
     racc (1.7.3)
@@ -40,7 +40,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rbs (3.4.1)
+    rbs (3.4.4)
       abbrev
     ruby2_keywords (0.0.5)
     securerandom (0.3.1)
@@ -59,7 +59,7 @@ GEM
       securerandom (>= 0.1)
       strscan (>= 1.0.0)
       terminal-table (>= 2, < 4)
-    strscan (3.0.8)
+    strscan (3.1.0)
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)
     tzinfo (2.0.6)
@@ -67,8 +67,8 @@ GEM
     unicode-display_width (2.5.0)
 
 PLATFORMS
+  arm64-darwin-22
   ruby
-  x86_64-linux
 
 DEPENDENCIES
   activesupport
@@ -76,4 +76,4 @@ DEPENDENCIES
   steep (~> 1.6.0)
 
 BUNDLED WITH
-   2.6.0.dev
+   2.5.4