diff --git a/pkgs/applications/version-management/mercurial/default.nix b/pkgs/applications/version-management/mercurial/default.nix
index 058d01233889..19ba699abef4 100644
--- a/pkgs/applications/version-management/mercurial/default.nix
+++ b/pkgs/applications/version-management/mercurial/default.nix
@@ -23,11 +23,11 @@ let
 
   self = python3Packages.buildPythonApplication rec {
     pname = "mercurial${lib.optionalString fullBuild "-full"}";
-    version = "6.6.2";
+    version = "6.6.3";
 
     src = fetchurl {
       url = "https://mercurial-scm.org/release/mercurial-${version}.tar.gz";
-      sha256 = "sha256-y0lNe+fdwvydMXHIiDCvnAKyHHU+PlET3vrJwDc7S2A=";
+      hash = "sha256-911qSnWCOht9cTpJZ+yi9Zb0ZuWPxrwG1yZCky/X4wc=";
     };
 
     format = "other";
@@ -37,7 +37,7 @@ let
     cargoDeps = if rustSupport then rustPlatform.fetchCargoTarball {
       inherit src;
       name = "mercurial-${version}";
-      sha256 = "sha256-yOysqMrTWDx/ENcJng8Rm338NI9vpuBGH6Yq8B7+MFg=";
+      sha256 = "sha256-G5tzwoIGOgpVI35rYXDeelnBgTbAiq7BDcXCHQzqSrs=";
       sourceRoot = "mercurial-${version}/rust";
     } else null;
     cargoRoot = if rustSupport then "rust" else null;