diff --git a/moto/core/models.py b/moto/core/models.py
index d22cda2bb..2482f4702 100644
--- a/moto/core/models.py
+++ b/moto/core/models.py
@@ -128,6 +128,8 @@ class BaseMockAWS:
             attr_value = getattr(klass, attr)
             if not hasattr(attr_value, "__call__"):
                 continue
+            if not hasattr(attr_value, "__name__"):
+                continue
 
             # Check if this is a classmethod. If so, skip patching
             if inspect.ismethod(attr_value) and attr_value.__self__ is klass:
diff --git a/requirements-tests.txt b/requirements-tests.txt
index 350da8111..1efb50046 100644
--- a/requirements-tests.txt
+++ b/requirements-tests.txt
@@ -1,5 +1,5 @@
 pytest
 pytest-cov
-sure==1.4.11
+sure
 freezegun
 pylint