diff --git a/Formula/a/arb.rb b/Formula/a/arb.rb
index b1126de54280b..8195f6ab1c4d2 100644
--- a/Formula/a/arb.rb
+++ b/Formula/a/arb.rb
@@ -19,6 +19,9 @@ class Arb < Formula
     sha256 cellar: :any_skip_relocation, x86_64_linux:   "a222fdd6fb56ff3fd9499ea8b6b0626e5935af09a922bff4692988c630d7aeb7"
   end
 
+  # See upstream discussion, https://github.com/fredrik-johansson/arb/issues/453
+  deprecate! date: "2023-10-21", because: "Merged into flint 3.0.0"
+
   depends_on "cmake" => :build
   depends_on "flint"
   depends_on "gmp"