diff --git a/third_party/2and3/yaml/constructor.pyi b/third_party/2and3/yaml/constructor.pyi
index 1c3d99861..685a8c820 100644
--- a/third_party/2and3/yaml/constructor.pyi
+++ b/third_party/2and3/yaml/constructor.pyi
@@ -1,3 +1,4 @@
+import sys
 from yaml.error import Mark, YAMLError, MarkedYAMLError
 from yaml.nodes import Node, ScalarNode, CollectionNode, SequenceNode, MappingNode
 
@@ -77,7 +78,8 @@ class Constructor(SafeConstructor):
     def find_python_name(self, name, mark): ...
     def construct_python_name(self, suffix, node): ...
     def construct_python_module(self, suffix, node): ...
-    class classobj: ...
+    if sys.version_info < (3, 0):
+        class classobj: ...
     def make_python_instance(self, suffix, node, args=..., kwds=..., newobj=...): ...
     def set_python_instance_state(self, instance, state): ...
     def construct_python_object(self, suffix, node): ...
diff --git a/third_party/2and3/yaml/representer.pyi b/third_party/2and3/yaml/representer.pyi
index eca81cf15..e850af201 100644
--- a/third_party/2and3/yaml/representer.pyi
+++ b/third_party/2and3/yaml/representer.pyi
@@ -1,3 +1,4 @@
+import sys
 from typing import Any
 from yaml.error import YAMLError
 
@@ -14,7 +15,8 @@ class BaseRepresenter:
     alias_key: Any
     def __init__(self, default_style=..., default_flow_style=..., sort_keys: bool = ...) -> None: ...
     def represent(self, data): ...
-    def get_classobj_bases(self, cls): ...
+    if sys.version_info < (3, 0):
+        def get_classobj_bases(self, cls): ...
     def represent_data(self, data): ...
     @classmethod
     def add_representer(cls, data_type, representer): ...
@@ -29,10 +31,11 @@ class SafeRepresenter(BaseRepresenter):
     def ignore_aliases(self, data): ...
     def represent_none(self, data): ...
     def represent_str(self, data): ...
-    def represent_unicode(self, data): ...
+    if sys.version_info < (3, 0):
+        def represent_unicode(self, data): ...
+        def represent_long(self, data): ...
     def represent_bool(self, data): ...
     def represent_int(self, data): ...
-    def represent_long(self, data): ...
     inf_value: Any
     def represent_float(self, data): ...
     def represent_list(self, data): ...
@@ -45,11 +48,12 @@ class SafeRepresenter(BaseRepresenter):
 
 class Representer(SafeRepresenter):
     def represent_str(self, data): ...
-    def represent_unicode(self, data): ...
-    def represent_long(self, data): ...
+    if sys.version_info < (3, 0):
+        def represent_unicode(self, data): ...
+        def represent_long(self, data): ...
+        def represent_instance(self, data): ...
     def represent_complex(self, data): ...
     def represent_tuple(self, data): ...
     def represent_name(self, data): ...
     def represent_module(self, data): ...
-    def represent_instance(self, data): ...
     def represent_object(self, data): ...