diff --git a/pkgs/development/python-modules/pip-tools/default.nix b/pkgs/development/python-modules/pip-tools/default.nix
index 9ac877be8848..1cda1fd87523 100644
--- a/pkgs/development/python-modules/pip-tools/default.nix
+++ b/pkgs/development/python-modules/pip-tools/default.nix
@@ -15,13 +15,13 @@
 
 buildPythonPackage rec {
   pname = "pip-tools";
-  version = "6.2.0";
+  version = "6.3.1";
 
   disabled = pythonOlder "3.6";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "9ed38c73da4993e531694ea151f77048b4dbf2ba7b94c4a569daa39568cc6564";
+    sha256 = "992d968df6f1a19d4d37c53b68b3d4b601b894fb3ee0926d1fa762ebc7c7e9e9";
   };
 
   LC_ALL = "en_US.UTF-8";