diff --git a/pkgs/development/python-modules/ibm-watson/default.nix b/pkgs/development/python-modules/ibm-watson/default.nix
index 375748d75cc6..43257149f58b 100644
--- a/pkgs/development/python-modules/ibm-watson/default.nix
+++ b/pkgs/development/python-modules/ibm-watson/default.nix
@@ -15,7 +15,7 @@
 
 buildPythonPackage rec {
   pname = "ibm-watson";
-  version = "6.0.0";
+  version = "6.1.0";
   format = "setuptools";
 
   disabled = pythonOlder "3.7";
@@ -23,8 +23,8 @@ buildPythonPackage rec {
   src = fetchFromGitHub {
     owner = "watson-developer-cloud";
     repo = "python-sdk";
-    rev = "v${version}";
-    sha256 = "sha256-AvWcw1VV47v2yvaqukPSql7rA7wVwrvtCDsvYtPZXKs=";
+    rev = "refs/tags/v${version}";
+    sha256 = "sha256-jvDkAwuDFgo7QlZ8N7TNVsY7+aXdIDc50uIIoO+5MLs=";
   };
 
   propagatedBuildInputs = [