diff --git a/IPython/core/completer.py b/IPython/core/completer.py
index 4d51ee4..1e04800 100644
--- a/IPython/core/completer.py
+++ b/IPython/core/completer.py
@@ -167,7 +167,6 @@ from typing import (
     TYPE_CHECKING,
     Set,
 )
-from typing_extensions import TypedDict, NotRequired
 
 from IPython.core.error import TryNext
 from IPython.core.inputtransformer2 import ESC_MAGIC
@@ -208,11 +207,14 @@ except ImportError:
 
 if TYPE_CHECKING:
     from typing import cast
+    from typing_extensions import TypedDict, NotRequired
 else:
 
     def cast(obj, _type):
         return obj
 
+    TypedDict = Dict
+    NotRequired = Tuple
 
 # -----------------------------------------------------------------------------
 # Globals
diff --git a/setup.cfg b/setup.cfg
index 0e37183..8d5136d 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -74,6 +74,7 @@ test_extra =
     numpy>=1.19
     pandas
     trio
+    typing_extensions
 all =
     %(black)s
     %(doc)s