diff --git a/Formula/buf.rb b/Formula/buf.rb
index 34333a6..607e13c 100644
--- a/Formula/buf.rb
+++ b/Formula/buf.rb
@@ -2,9 +2,9 @@ class Buf < Formula
   desc "The best way of working with Protocol Buffers."
   homepage "https://buf.build"
   head "https://github.com/bufbuild/buf.git", branch: "main"
-  url "https://github.com/bufbuild/buf/archive/v1.39.0.tar.gz"
-  sha256 "8a3856cff8cdc1ffc4c8ae6dd8eec9c1f4a96a0a25e79574d76d8a2d7e3e9196"
-  version "1.39.0"
+  url "https://github.com/bufbuild/buf/archive/v1.40.0.tar.gz"
+  sha256 "bc340f49b0000cd4869dcd1ff237256c9daa2cd5ea1120168090d994549e623e"
+  version "1.40.0"
 
   depends_on "go" => :build