diff --git a/pkgs/development/python-modules/cdcs/default.nix b/pkgs/development/python-modules/cdcs/default.nix
index 2db23ae82f9b..65d2ec2afefa 100644
--- a/pkgs/development/python-modules/cdcs/default.nix
+++ b/pkgs/development/python-modules/cdcs/default.nix
@@ -41,6 +41,12 @@ buildPythonPackage rec {
 
   pythonImportsCheck = [ "cdcs" ];
 
+  disabledTests = [
+    # Assertion errors
+    "test_get_workspaces_v2"
+    "test_get_workspaces_v3"
+  ];
+
   meta = {
     description = "Python client for performing REST calls to configurable data curation system (CDCS) databases";
     homepage = "https://github.com/usnistgov/pycdcs";