diff --git a/Formula/s/shellinabox.rb b/Formula/s/shellinabox.rb
index df4182135e77b..6019f138dd6f4 100644
--- a/Formula/s/shellinabox.rb
+++ b/Formula/s/shellinabox.rb
@@ -1,27 +1,18 @@
 class Shellinabox < Formula
   desc "Export command-line tools to web based terminal emulator"
   homepage "https://github.com/shellinabox/shellinabox"
-  url "https://github.com/shellinabox/shellinabox/archive/refs/tags/v2.20.tar.gz"
-  sha256 "27a5ec6c3439f87aee238c47cc56e7357a6249e5ca9ed0f044f0057ef389d81e"
+  url "https://github.com/shellinabox/shellinabox/archive/refs/tags/v2.21.tar.gz"
+  sha256 "2a8f94beb286d0851bb146f7a7c480a8740f59b959cbd274e21a8fcbf0a7f307"
   license "GPL-2.0-only"
-  revision 1
-
-  no_autobump! because: :requires_manual_review
 
   bottle do
-    rebuild 2
-    sha256 cellar: :any_skip_relocation, arm64_sequoia:  "b3bc61dfd3c0f3764b43daadc5f1538a1108f349b60cf26903487c1e7bb0a909"
-    sha256 cellar: :any_skip_relocation, arm64_sonoma:   "d213c9fb7b6d4654f23daa401acf2ca7d7bae0049c18cd9e845275610d06a24f"
-    sha256 cellar: :any_skip_relocation, arm64_ventura:  "0d00dfd6b119c7d8555081e4ad821d67ecf0da641c5630435e67c3c9eadedd1a"
-    sha256 cellar: :any_skip_relocation, arm64_monterey: "9b29df2258a90e8cfef9e54cf0569c1e556f07911d0dbb934e6760487416a3f4"
-    sha256 cellar: :any_skip_relocation, arm64_big_sur:  "ceb68ab288df2b997e3c7361cd6e8c0fb389ee9fa187503f14e2bd5f00393f03"
-    sha256 cellar: :any_skip_relocation, sonoma:         "292a074e3985e260888cca30d4bedc59bbd879b8235259c9afd8bad112d72e0b"
-    sha256 cellar: :any_skip_relocation, ventura:        "d303f6e2a79b3022f4659934635aa4c7fb4abeb18384bfafb1c012064a03018c"
-    sha256 cellar: :any_skip_relocation, monterey:       "17b6552900a2b8eb5297e6db21d07479821a95cbcc3d34d0c553e47ebd2595ed"
-    sha256 cellar: :any_skip_relocation, big_sur:        "920301191fb40b3f036e5d08175f829e512f9e6df63760cdc389a12a7c01429f"
-    sha256 cellar: :any_skip_relocation, catalina:       "a0d28e1679ea480a87fa8deeae9f3378f18322d6f3062d4a0f0dd71dbe5c6469"
-    sha256 cellar: :any_skip_relocation, arm64_linux:    "902b4bafa9a15233ccd8f67815f447bb38700e85b5883bf310a37b6419d4dbbb"
-    sha256 cellar: :any_skip_relocation, x86_64_linux:   "402a852e03ce83de0813d1775222f02e1fd4a52e13ce6757bd16a3adda0688fa"
+    sha256 cellar: :any_skip_relocation, arm64_sequoia: "cc3dcfc6ccd491c7a24fca6e89f3ee3c5547a379bc257904e323413dbe21619f"
+    sha256 cellar: :any_skip_relocation, arm64_sonoma:  "1e5286ea7ca63bbada9f3f775f2f2d8c1006fb1f51c9640925ccceba4e0e37c6"
+    sha256 cellar: :any_skip_relocation, arm64_ventura: "99818243818b0086763a7ceef6b417e5dd13b381cb9fd48e956566a26f74b3e4"
+    sha256 cellar: :any_skip_relocation, sonoma:        "e4511e725a582f0c03023a72a8178aadb64e6d8b05c359db2959fe606ab6bc4c"
+    sha256 cellar: :any_skip_relocation, ventura:       "40f88ccd430e1264efea4852697d509ce3c8fa13a2c4a0d16c6415da020a82fc"
+    sha256 cellar: :any_skip_relocation, arm64_linux:   "15393ab741f33679642c18979f8b84e8f0d164cdd014cc1579a446dbd6d40125"
+    sha256 cellar: :any_skip_relocation, x86_64_linux:  "95159f182fd5741459af55763c3f1b3cc2e15d2339ecf59a54b23c8d83a0877b"
   end
 
   depends_on "autoconf" => :build