diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index db0dbdb3..49759c9d 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -49,7 +49,6 @@ repos:
     -   id: mypy
         additional_dependencies:
         -   mypy-protobuf
-        # exclude: 'tests/|crypto/|identity/|pubsub/|insecure/|noise/|security/'
         exclude: 'tests/'
 -   repo: local
     hooks:
diff --git a/examples/echo/echo.py b/examples/echo/echo.py
index c1fa2c98..d9039715 100644
--- a/examples/echo/echo.py
+++ b/examples/echo/echo.py
@@ -78,8 +78,8 @@ async def run(port: int, destination: str, seed: int = None) -> None:
             await stream.close()
             response = await stream.read()
 
-            print(f"Sent: {msg}")
-            print(f"Got: {response}")
+            print(f"Sent: {msg.decode('utf-8')}")
+            print(f"Got: {response.decode('utf-8')}")
 
 
 def main() -> None:
diff --git a/libp2p/host/basic_host.py b/libp2p/host/basic_host.py
index 6c39759f..18054290 100644
--- a/libp2p/host/basic_host.py
+++ b/libp2p/host/basic_host.py
@@ -1,3 +1,6 @@
+from contextlib import (
+    asynccontextmanager,
+)
 import logging
 from typing import (
     TYPE_CHECKING,
@@ -6,9 +9,6 @@ from typing import (
     Sequence,
 )
 
-from async_generator import (
-    asynccontextmanager,
-)
 from async_service import (
     background_trio_service,
 )
@@ -145,8 +145,7 @@ class BasicHost(IHost):
                 addrs.append(addr.encapsulate(p2p_part))
         return addrs
 
-    # type ignored because asynccontextmanager decorator is untyped
-    @asynccontextmanager  # type: ignore
+    @asynccontextmanager
     async def run(
         self, listen_addrs: Sequence[multiaddr.Multiaddr]
     ) -> AsyncIterator[None]:
diff --git a/libp2p/tools/factories.py b/libp2p/tools/factories.py
index 35ed1cfb..42f81646 100644
--- a/libp2p/tools/factories.py
+++ b/libp2p/tools/factories.py
@@ -1,3 +1,6 @@
+from contextlib import (
+    asynccontextmanager,
+)
 from typing import (
     Any,
     AsyncIterator,
@@ -12,9 +15,6 @@ from typing import (
 from async_exit_stack import (
     AsyncExitStack,
 )
-from async_generator import (
-    asynccontextmanager,
-)
 from async_service import (
     background_trio_service,
 )
diff --git a/libp2p/tools/interop/daemon.py b/libp2p/tools/interop/daemon.py
index a7a69cec..74bbc512 100644
--- a/libp2p/tools/interop/daemon.py
+++ b/libp2p/tools/interop/daemon.py
@@ -1,10 +1,10 @@
+from contextlib import (
+    asynccontextmanager,
+)
 from typing import (
     AsyncIterator,
 )
 
-from async_generator import (
-    asynccontextmanager,
-)
 import multiaddr
 from multiaddr import (
     Multiaddr,
diff --git a/libp2p/tools/pubsub/dummy_account_node.py b/libp2p/tools/pubsub/dummy_account_node.py
index bef47553..ec12ade2 100644
--- a/libp2p/tools/pubsub/dummy_account_node.py
+++ b/libp2p/tools/pubsub/dummy_account_node.py
@@ -1,3 +1,6 @@
+from contextlib import (
+    asynccontextmanager,
+)
 from typing import (
     AsyncIterator,
     Dict,
@@ -7,9 +10,6 @@ from typing import (
 from async_exit_stack import (
     AsyncExitStack,
 )
-from async_generator import (
-    asynccontextmanager,
-)
 from async_service import (
     Service,
     background_trio_service,
diff --git a/newsfragments/464.internal.rst b/newsfragments/464.internal.rst
new file mode 100644
index 00000000..be68fd3e
--- /dev/null
+++ b/newsfragments/464.internal.rst
@@ -0,0 +1 @@
+Turn ``mypy`` checks on and remove ``async_generator`` dependency
diff --git a/setup.py b/setup.py
index f1e31729..b099687a 100644
--- a/setup.py
+++ b/setup.py
@@ -61,7 +61,6 @@ install_requires = [
     "protobuf>=3.10.0",
     "coincurve>=10.0.0",
     "pynacl==1.3.0",
-    "async_generator==1.10",
     "trio>=0.15.0",
     "async-service>=0.1.0a6",
     "async-exit-stack==1.0.1",