diff --git a/pkgs/applications/version-management/mercurial/default.nix b/pkgs/applications/version-management/mercurial/default.nix
index 5f2f9837cc01..73d481845ff8 100644
--- a/pkgs/applications/version-management/mercurial/default.nix
+++ b/pkgs/applications/version-management/mercurial/default.nix
@@ -21,11 +21,11 @@ let
 
   self = python3Packages.buildPythonApplication rec {
     pname = "mercurial${lib.optionalString fullBuild "-full"}";
-    version = "6.4.2";
+    version = "6.4.3";
 
     src = fetchurl {
       url = "https://mercurial-scm.org/release/mercurial-${version}.tar.gz";
-      sha256 = "sha256-W59qPDX05GlchU73FCjPlGHKGlKfaRwG3G97SOe7MzU=";
+      sha256 = "sha256-p3+2LTJZNKg6ALL8bbEJ9ExnuGdo/EBJA2b1E2QMf2Q=";
     };
 
     format = "other";
@@ -35,7 +35,7 @@ let
     cargoDeps = if rustSupport then rustPlatform.fetchCargoTarball {
       inherit src;
       name = "mercurial-${version}";
-      sha256 = "sha256-dRajIqM91fESEm4EEa9qvS8h6/HlLZIJZztVGoS/G+M=";
+      sha256 = "sha256-nm9RZZHtmPfeJ7StHZmfxcFqKeJHACQQeA/Evv3wYD8=";
       sourceRoot = "mercurial-${version}/rust";
     } else null;
     cargoRoot = if rustSupport then "rust" else null;