diff --git a/.ruby-version b/.ruby-version
index 6cb9d3dd..f9892605 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.4.3
+3.4.4
diff --git a/Dockerfile b/Dockerfile
index 14fbd230..58befbf0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:3.4.3
+FROM ruby:3.4.4
 
 WORKDIR /src
 ENTRYPOINT bundle install && bundle exec jekyll serve \
diff --git a/Gemfile.lock b/Gemfile.lock
index 37f1299a..b374e4b0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -39,19 +39,25 @@ GEM
       fiber-storage
     fiber-storage (1.0.1)
     forwardable-extended (2.6.0)
-    google-protobuf (4.30.2)
+    google-protobuf (4.31.0)
       bigdecimal
       rake (>= 13)
-    google-protobuf (4.30.2-aarch64-linux)
+    google-protobuf (4.31.0-aarch64-linux-gnu)
       bigdecimal
       rake (>= 13)
-    google-protobuf (4.30.2-arm64-darwin)
+    google-protobuf (4.31.0-aarch64-linux-musl)
       bigdecimal
       rake (>= 13)
-    google-protobuf (4.30.2-x86_64-darwin)
+    google-protobuf (4.31.0-arm64-darwin)
       bigdecimal
       rake (>= 13)
-    google-protobuf (4.30.2-x86_64-linux)
+    google-protobuf (4.31.0-x86_64-darwin)
+      bigdecimal
+      rake (>= 13)
+    google-protobuf (4.31.0-x86_64-linux-gnu)
+      bigdecimal
+      rake (>= 13)
+    google-protobuf (4.31.0-x86_64-linux-musl)
       bigdecimal
       rake (>= 13)
     hashery (2.1.2)
@@ -68,7 +74,7 @@ GEM
     http_parser.rb (0.8.0)
     i18n (1.14.7)
       concurrent-ruby (~> 1.0)
-    io-event (1.10.0)
+    io-event (1.10.1)
     jekyll (4.4.1)
       addressable (~> 2.4)
       base64 (~> 0.2)
@@ -104,7 +110,7 @@ GEM
       jekyll (>= 3.7, < 5.0)
     jekyll-watch (2.2.1)
       listen (~> 3.0)
-    json (2.11.3)
+    json (2.12.0)
     kramdown (2.5.1)
       rexml (>= 3.3.9)
     kramdown-parser-gfm (1.1.0)
@@ -161,22 +167,22 @@ GEM
     rouge (4.5.2)
     ruby-rc4 (0.1.5)
     safe_yaml (1.0.5)
-    sass-embedded (1.88.0-aarch64-linux-gnu)
-      google-protobuf (~> 4.30)
-    sass-embedded (1.88.0-aarch64-linux-musl)
-      google-protobuf (~> 4.30)
-    sass-embedded (1.88.0-arm-linux-gnueabihf)
-      google-protobuf (~> 4.30)
-    sass-embedded (1.88.0-arm-linux-musleabihf)
-      google-protobuf (~> 4.30)
-    sass-embedded (1.88.0-arm64-darwin)
-      google-protobuf (~> 4.30)
-    sass-embedded (1.88.0-x86_64-darwin)
-      google-protobuf (~> 4.30)
-    sass-embedded (1.88.0-x86_64-linux-gnu)
-      google-protobuf (~> 4.30)
-    sass-embedded (1.88.0-x86_64-linux-musl)
-      google-protobuf (~> 4.30)
+    sass-embedded (1.89.0-aarch64-linux-gnu)
+      google-protobuf (~> 4.31)
+    sass-embedded (1.89.0-aarch64-linux-musl)
+      google-protobuf (~> 4.31)
+    sass-embedded (1.89.0-arm-linux-gnueabihf)
+      google-protobuf (~> 4.31)
+    sass-embedded (1.89.0-arm-linux-musleabihf)
+      google-protobuf (~> 4.31)
+    sass-embedded (1.89.0-arm64-darwin)
+      google-protobuf (~> 4.31)
+    sass-embedded (1.89.0-x86_64-darwin)
+      google-protobuf (~> 4.31)
+    sass-embedded (1.89.0-x86_64-linux-gnu)
+      google-protobuf (~> 4.31)
+    sass-embedded (1.89.0-x86_64-linux-musl)
+      google-protobuf (~> 4.31)
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)
     traces (0.15.2)
@@ -190,7 +196,7 @@ GEM
     unicode-display_width (2.6.0)
     webrick (1.9.1)
     yell (2.2.2)
-    zeitwerk (2.7.2)
+    zeitwerk (2.7.3)
 
 PLATFORMS
   aarch64-linux
@@ -219,4 +225,4 @@ DEPENDENCIES
   truncato
 
 BUNDLED WITH
-   2.6.8
+   2.6.9
diff --git a/README.md b/README.md
index dec0c741..1103ef11 100644
--- a/README.md
+++ b/README.md
@@ -93,8 +93,8 @@ $ sudo apt install rbenv   # Debian, Ubuntu 系のディストリビューショ
 ## ↑ ココまで OS 個別の準備
 ## ↓ ココから OS 共通の準備
 
-# Ruby 3.4.3 をインストール
-$ rbenv install 3.4.3
+# Ruby 3.4.4 をインストール
+$ rbenv install 3.4.4
 
 # Ruby が入っていることを確認
 $ ruby --version