diff --git a/Formula/b/bsc.rb b/Formula/b/bsc.rb
index 668dfb3507c5c..fcb72dd95fea2 100644
--- a/Formula/b/bsc.rb
+++ b/Formula/b/bsc.rb
@@ -1,12 +1,25 @@
 class Bsc < Formula
   desc "Bluespec Compiler (BSC)"
   homepage "https://github.com/B-Lang-org/bsc"
-  url "https://github.com/B-Lang-org/bsc.git",
-    tag:      "2025.01.1",
-    revision: "65e3a87a17f6b9cf38cbb7b6ad7a4473f025c098"
   license "BSD-3-Clause"
   head "https://github.com/B-Lang-org/bsc.git", branch: "main"
 
+  stable do
+    url "https://github.com/B-Lang-org/bsc.git",
+        tag:      "2025.01.1",
+        revision: "65e3a87a17f6b9cf38cbb7b6ad7a4473f025c098"
+
+    # Backport support for TCL 9
+    patch do
+      url "https://github.com/B-Lang-org/bsc/commit/8dbe999224a5d7d644e11274e696ea3536026683.patch?full_index=1"
+      sha256 "2a17f251216fbf874804ff7664ffd863767969f9b7a7cfe6858b322b1acc027e"
+    end
+    patch do
+      url "https://github.com/B-Lang-org/bsc/commit/36da7029be8ae11e8889db9a312f514663e44b96.patch?full_index=1"
+      sha256 "ba76094403b68d16c47ee4fae124dec4cb2664e4391dc37a06082bde1a23bf72"
+    end
+  end
+
   no_autobump! because: :requires_manual_review
 
   bottle do
@@ -27,12 +40,12 @@ class Bsc < Formula
   depends_on "pkgconf" => :build
   depends_on "gmp"
   depends_on "icarus-verilog"
-  depends_on "tcl-tk@8"
 
   uses_from_macos "bison" => :build
   uses_from_macos "flex" => :build
   uses_from_macos "libffi"
   uses_from_macos "perl"
+  uses_from_macos "tcl-tk"
 
   conflicts_with "libbsc", because: "both install `bsc` binaries"