diff --git a/pkgs/development/python-modules/cot/default.nix b/pkgs/development/python-modules/cot/default.nix
index 9b7914e5b9c1..ed40735a2063 100644
--- a/pkgs/development/python-modules/cot/default.nix
+++ b/pkgs/development/python-modules/cot/default.nix
@@ -66,6 +66,10 @@ buildPythonPackage rec {
     "TestVMDKConversion"
     # CLI test fails with AssertionError
     "test_help"
+    # Failing TestCOTDeployESXi tests
+    "test_serial_fixup_stubbed"
+    "test_serial_fixup_stubbed_create"
+    "test_serial_fixup_stubbed_vm_not_found"
   ] ++ lib.optionals stdenv.isDarwin [
     "test_serial_fixup_invalid_host"
   ];