diff --git a/Dockerfile b/Dockerfile
index a3f68ea..e2ec50f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,7 +11,8 @@ pip3 install \
         certifi==2020.12.5 chardet==4.0.0 idna==2.10 urllib3==1.26.4 \
         six==1.15.0 msgpack==1.0.2 \
     influxdb_client==1.24.0 rx==3.2.0 \
-    yagrc==1.1.1 grpcio-reflection==1.36.1 protobuf==3.15.6
+    yagrc==1.1.1 grpcio-reflection==1.36.1 protobuf==3.15.6 \
+    typing-extensions==4.3.0
 
 ADD . /app
 WORKDIR /app
diff --git a/packaging/setup.cfg b/packaging/setup.cfg
index 2c0b772..b740447 100644
--- a/packaging/setup.cfg
+++ b/packaging/setup.cfg
@@ -19,6 +19,7 @@ install_requires =
     grpcio>=1.12.0
     protobuf>=3.6.0
     yagrc>=1.1.1
+    typing-extensions>=4.3.0
 package_dir =
     =..
 py_modules =
diff --git a/requirements.txt b/requirements.txt
index f1b25eb..f401847 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,3 +6,4 @@ paho-mqtt>=1.5.1
 influxdb>=5.3.1
 influxdb_client>=1.23.0
 pypng>=0.0.20
+typing-extensions>=4.3.0
\ No newline at end of file
diff --git a/starlink_grpc.py b/starlink_grpc.py
index 55da404..9dd4463 100644
--- a/starlink_grpc.py
+++ b/starlink_grpc.py
@@ -362,18 +362,8 @@ period.
 from itertools import chain
 import math
 import statistics
-from typing import Any, Dict, Iterable, List, Optional, Sequence, Tuple, get_type_hints
-try:
-    from typing import TypedDict, get_args
-except ImportError:
-    # Python 3.7 does not have TypedDict, so fake it so the run time still
-    # works, even though static type checker probably will not.
-    def TypedDict(name, types):  # pylint: disable=invalid-name
-        return type(name, (dict,), {"__annotations__": types})
-
-    def get_args(tp: Any) -> Tuple[Any, ...]:
-        return tp.__args__
-
+from typing import Dict, Iterable, List, Optional, Sequence, Tuple, get_type_hints
+from typing_extensions import TypedDict, get_args
 
 import grpc
 
@@ -549,7 +539,9 @@ class GrpcError(Exception):
 
 
 class UnwrappedHistory:
-    """Empty class for holding a copy of grpc history data."""
+    """Class for holding a copy of grpc history data."""
+
+    unwrapped: bool
 
 
 class ChannelContext:
@@ -1031,7 +1023,7 @@ def concatenate_history(history1, history2, samples1: int = -1, start1: Optional
             print("WARNING: Appending discontiguous samples. Polling interval probably too short.")
         new_samples = size2
 
-    unwrapped: Any = UnwrappedHistory()
+    unwrapped = UnwrappedHistory()
     for field in HISTORY_FIELDS:
         setattr(unwrapped, field, [])
     unwrapped.unwrapped = True