diff --git a/Aliases/libgit2@1.8 b/Aliases/libgit2@1.9
similarity index 100%
rename from Aliases/libgit2@1.8
rename to Aliases/libgit2@1.9
diff --git a/Formula/lib/libgit2.rb b/Formula/lib/libgit2.rb
index 12f46adc432fdd..ff179900c489e2 100644
--- a/Formula/lib/libgit2.rb
+++ b/Formula/lib/libgit2.rb
@@ -1,8 +1,8 @@
 class Libgit2 < Formula
   desc "C library of Git core methods that is re-entrant and linkable"
   homepage "https://libgit2.github.com/"
-  url "https://github.com/libgit2/libgit2/archive/refs/tags/v1.8.4.tar.gz"
-  sha256 "49d0fc50ab931816f6bfc1ac68f8d74b760450eebdb5374e803ee36550f26774"
+  url "https://github.com/libgit2/libgit2/archive/refs/tags/v1.9.0.tar.gz"
+  sha256 "75b27d4d6df44bd34e2f70663cfd998f5ec41e680e1e593238bbe517a84c7ed2"
   license "GPL-2.0-only" => { with: "GCC-exception-2.0" }
   head "https://github.com/libgit2/libgit2.git", branch: "main"