diff --git a/Casks/t/tortoisehg.rb b/Casks/t/tortoisehg.rb
index c4065e7469..e7577206a2 100644
--- a/Casks/t/tortoisehg.rb
+++ b/Casks/t/tortoisehg.rb
@@ -1,6 +1,6 @@
 cask "tortoisehg" do
-  version "6.5.1"
-  sha256 "eadc6f3b3e55af5d229b362aa973f1d7710a06df2f600ed6f6a2f86692933e79"
+  version "6.6.3"
+  sha256 "d8c1fec60eb64c93c612ced84ca7e012880c7b989cafe51c7b19aa335a0a88ac"
 
   url "https://www.mercurial-scm.org/release/tortoisehg/macos/TortoiseHg-#{version}-mac-x64-qt5.dmg",
       verified: "mercurial-scm.org/release/tortoisehg/"