diff --git a/pkgs/development/python-modules/fastbencode/default.nix b/pkgs/development/python-modules/fastbencode/default.nix
index 25112d0dab63..268ec30ab89d 100644
--- a/pkgs/development/python-modules/fastbencode/default.nix
+++ b/pkgs/development/python-modules/fastbencode/default.nix
@@ -12,19 +12,19 @@
 
 buildPythonPackage rec {
   pname = "fastbencode";
-  version = "0.3.8";
+  version = "0.3.9";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "breezy-team";
     repo = "fastbencode";
     tag = "v${version}";
-    hash = "sha256-vpo8OVhIm9/niMY6A878FRJ+zU98z9CJe/p5UxmvrLo=";
+    hash = "sha256-TZGIFcWm037h4Xs6e5a9j24FqhNxP9H71QVtL1homjQ=";
   };
 
   cargoDeps = rustPlatform.fetchCargoVendor {
     inherit pname version src;
-    hash = "sha256-N4diwjHZkJk+Tzu609ueRipfIXyNhXhLG7hpnG1gRa4=";
+    hash = "sha256-4DP8WOho4CKESfQHynZlosafcGPFqjpaOiZfLkcML3A=";
   };
 
   nativeBuildInputs = [