diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 7c416a5295d..bd5cc9ed316 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -4895,11 +4895,11 @@ let
 
   dulwich = buildPythonPackage rec {
     name = "dulwich-${version}";
-    version = "0.9.8";
+    version = "0.10.1a";
 
     src = pkgs.fetchurl {
       url = "https://pypi.python.org/packages/source/d/dulwich/${name}.tar.gz";
-      sha256 = "0iwxp9n2c09wahq8bqnc5z431kq5bs75vbwl93nzwm2grj00l6lb";
+      sha256 = "02rknqarwy7p50693cqswbibqwgxzrfzdq4yhwqxbdmhbsmh0rk6";
     };
 
     # Only test dependencies