diff --git a/pkgs/development/python-modules/ibm-watson/default.nix b/pkgs/development/python-modules/ibm-watson/default.nix
index f642aaff0277..182fb24cc2d9 100644
--- a/pkgs/development/python-modules/ibm-watson/default.nix
+++ b/pkgs/development/python-modules/ibm-watson/default.nix
@@ -16,7 +16,7 @@
 
 buildPythonPackage rec {
   pname = "ibm-watson";
-  version = "8.1.0";
+  version = "9.0.0";
   pyproject = true;
 
   disabled = pythonOlder "3.7";
@@ -25,7 +25,7 @@ buildPythonPackage rec {
     owner = "watson-developer-cloud";
     repo = "python-sdk";
     tag = "v${version}";
-    hash = "sha256-r7A5i17KIy1pBrj01yeknfrOFjb5yZco8ZOc7tlFM7k=";
+    hash = "sha256-JZriBvdeDAZ+NOnWCsjI2m5JlLe/oLlbtFkdFeuL8TI=";
   };
 
   build-system = [ setuptools ];
@@ -49,7 +49,7 @@ buildPythonPackage rec {
   meta = with lib; {
     description = "Client library to use the IBM Watson Services";
     homepage = "https://github.com/watson-developer-cloud/python-sdk";
-    changelog = "https://github.com/watson-developer-cloud/python-sdk/blob/v${version}/CHANGELOG.md";
+    changelog = "https://github.com/watson-developer-cloud/python-sdk/blob/${src.tag}/CHANGELOG.md";
     license = licenses.asl20;
     maintainers = with maintainers; [ globin ];
   };