diff --git a/Gemfile b/Gemfile
index 224f89c..3357a89 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 # Specify your gem's dependencies in codebook.gemspec.
 gemspec
 
-gem "tailwindcss-rails", "~> 2.0"
+gem "tailwindcss-rails", "~> 4.2"
 gem "stimulus-rails"
 gem "turbo-rails"
 gem "jsbundling-rails"
diff --git a/Gemfile.lock b/Gemfile.lock
index a15316f..92448df 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -245,16 +245,16 @@ GEM
     stimulus-rails (1.3.4)
       railties (>= 6.0.0)
     stringio (3.1.7)
-    tailwindcss-rails (2.7.9-aarch64-linux)
-      railties (>= 7.0.0)
-    tailwindcss-rails (2.7.9-arm-linux)
-      railties (>= 7.0.0)
-    tailwindcss-rails (2.7.9-arm64-darwin)
-      railties (>= 7.0.0)
-    tailwindcss-rails (2.7.9-x86_64-darwin)
-      railties (>= 7.0.0)
-    tailwindcss-rails (2.7.9-x86_64-linux)
+    tailwindcss-rails (4.2.3)
       railties (>= 7.0.0)
+      tailwindcss-ruby (~> 4.0)
+    tailwindcss-ruby (4.1.5)
+    tailwindcss-ruby (4.1.5-aarch64-linux-gnu)
+    tailwindcss-ruby (4.1.5-aarch64-linux-musl)
+    tailwindcss-ruby (4.1.5-arm64-darwin)
+    tailwindcss-ruby (4.1.5-x86_64-darwin)
+    tailwindcss-ruby (4.1.5-x86_64-linux-gnu)
+    tailwindcss-ruby (4.1.5-x86_64-linux-musl)
     thor (1.3.2)
     timeout (0.4.3)
     turbo-rails (2.0.13)
@@ -291,7 +291,7 @@ DEPENDENCIES
   rubocop-rails-omakase
   sqlite3
   stimulus-rails
-  tailwindcss-rails (~> 2.0)
+  tailwindcss-rails (~> 4.2)
   turbo-rails
 
 BUNDLED WITH