diff --git a/asyncpg/pgproto b/asyncpg/pgproto
index 76091445..2dc7cc46 160000
--- a/asyncpg/pgproto
+++ b/asyncpg/pgproto
@@ -1 +1 @@
-Subproject commit 76091445db8b49a7d78504b47eb34fcbfbb89567
+Subproject commit 2dc7cc4635b08418dfbc6105b45947244102e86d
diff --git a/setup.py b/setup.py
index 5bb9e693..7ed4064c 100644
--- a/setup.py
+++ b/setup.py
@@ -291,6 +291,7 @@ def finalize_options(self):
             extra_compile_args=CFLAGS,
             extra_link_args=LDFLAGS),
     ],
+    install_requires=['typing-extensions>=3.7.4.3;python_version<"3.8"'],
     cmdclass={'build_ext': build_ext, 'build_py': build_py, 'sdist': sdist},
     test_suite='tests.suite',
     extras_require=EXTRA_DEPENDENCIES,