diff --git a/CHANGELOG.md b/CHANGELOG.md
index 40676c2..301dc56 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 ## next / unreleased
 
-* Update to [Tailwind CSS v3.3.7](https://github.com/tailwindlabs/tailwindcss/releases/tag/v3.3.7) from v3.3.6 by @flavorjones
+* Update to [Tailwind CSS v3.4.0](https://github.com/tailwindlabs/tailwindcss/releases/tag/v3.4.0) from v3.3.6 by @flavorjones
 
 
 ## v2.0.33 / 2023-12-09
diff --git a/lib/tailwindcss/upstream.rb b/lib/tailwindcss/upstream.rb
index a64f6b3..ed11a88 100644
--- a/lib/tailwindcss/upstream.rb
+++ b/lib/tailwindcss/upstream.rb
@@ -1,7 +1,7 @@
 module Tailwindcss
   # constants describing the upstream tailwindcss project
   module Upstream
-    VERSION = "v3.3.7"
+    VERSION = "v3.4.0"
 
     # rubygems platform name => upstream release filename
     NATIVE_PLATFORMS = {