diff --git a/pkgs/development/python-modules/gradient/default.nix b/pkgs/development/python-modules/gradient/default.nix
index 9a2f89e8c419..92ddbbd73f7b 100644
--- a/pkgs/development/python-modules/gradient/default.nix
+++ b/pkgs/development/python-modules/gradient/default.nix
@@ -22,11 +22,11 @@
 
 buildPythonPackage rec {
   pname = "gradient";
-  version = "1.4.3";
+  version = "1.5.5";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "a8fa91669c97440049132119019e90d0a9cf09e96352cf43c7c6ca244894bd4e";
+    sha256 = "fee5016afe5e61a640bb9d7e234a10926c17c9e83c876b617438ff5f5ce039ad";
   };
 
   postPatch = ''