diff --git a/Formula/charm-tools.rb b/Formula/charm-tools.rb
index d12c5d49959fc..ab8f2e8d0482e 100644
--- a/Formula/charm-tools.rb
+++ b/Formula/charm-tools.rb
@@ -6,6 +6,7 @@ class CharmTools < Formula
   url "https://files.pythonhosted.org/packages/1a/77/552dbd44cfc28daa6db06436cce906bbdf452ba6de0059b58b5d892b3317/charm-tools-2.7.8.tar.gz"
   sha256 "f16b3f8b1033451cc6503f2a2eca83e746dac548506ecf547c495cd83784f9f2"
   license "GPL-3.0"
+  revision 1
 
   livecheck do
     url :stable
@@ -47,8 +48,8 @@ class CharmTools < Formula
   end
 
   resource "cffi" do
-    url "https://files.pythonhosted.org/packages/05/54/3324b0c46340c31b909fcec598696aaec7ddc8c18a63f2db352562d3354c/cffi-1.14.0.tar.gz"
-    sha256 "2d384f4a127a15ba701207f7639d94106693b6cd64173d6c8988e2c25f3ac2b6"
+    url "https://files.pythonhosted.org/packages/66/6a/98e023b3d11537a5521902ac6b50db470c826c682be6a8c661549cb7717a/cffi-1.14.4.tar.gz"
+    sha256 "1a465cbe98a7fd391d47dce4b8f7e5b921e6cd805ef421d04f5f66ba8f06086c"
   end
 
   resource "chardet" do