diff --git a/app/fizz/fizzbar/interface.py b/app/fizz/fizzbar/interface.py
index 6b64ec1..7e49f68 100644
--- a/app/fizz/fizzbar/interface.py
+++ b/app/fizz/fizzbar/interface.py
@@ -1,4 +1,4 @@
-from typing import TypedDict
+from mypy_extensions  import TypedDict
 
 
 class FizzbarInterface(TypedDict, total=False):
diff --git a/app/fizz/fizzbaz/interface.py b/app/fizz/fizzbaz/interface.py
index b79050d..82f6c69 100644
--- a/app/fizz/fizzbaz/interface.py
+++ b/app/fizz/fizzbaz/interface.py
@@ -1,4 +1,4 @@
-from typing import TypedDict
+from mypy_extensions  import TypedDict
 
 
 class FizzbazInterface(TypedDict, total=False):
diff --git a/app/other_api/doodad/interface.py b/app/other_api/doodad/interface.py
index 4f54e73..2e816ac 100644
--- a/app/other_api/doodad/interface.py
+++ b/app/other_api/doodad/interface.py
@@ -1,4 +1,4 @@
-from typing import TypedDict
+from mypy_extensions  import TypedDict
 
 
 class DoodadInterface(TypedDict, total=False):
diff --git a/app/other_api/whatsit/interface.py b/app/other_api/whatsit/interface.py
index eee8bb7..a4b57ba 100644
--- a/app/other_api/whatsit/interface.py
+++ b/app/other_api/whatsit/interface.py
@@ -1,4 +1,4 @@
-from typing import TypedDict
+from mypy_extensions  import TypedDict
 
 
 class WhatsitInterface(TypedDict, total=False):
diff --git a/app/widget/interface.py b/app/widget/interface.py
index 659276e..f747a7b 100644
--- a/app/widget/interface.py
+++ b/app/widget/interface.py
@@ -1,4 +1,4 @@
-from typing import TypedDict
+from mypy_extensions  import TypedDict
 
 
 class WidgetInterface(TypedDict, total=False):
diff --git a/requirements.txt b/requirements.txt
index 2e8fa8f..8a532ee 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,6 +16,7 @@ Jinja2==2.11.2
 jsonschema==3.2.0
 MarkupSafe==1.1.1
 marshmallow==3.8.0
+mypy-extensions==0.4.3
 numpy==1.19.2
 packaging==20.4
 pandas==1.1.3