update dependencies

setup.py

@@ -66,7 +66,7 @@ setup(
         "Brotli>=1.0,<1.1",
         "certifi>=2019.9.11",  # no semver here - this should always be on the last release!
         "click>=7.0,<8",
-        "cryptography>=3.0,<3.1",
+        "cryptography>=3.0,<3.2",
         "flask>=1.1.1,<1.2",
         "h2>=3.2.0,<4",
         "hyperframe>=5.1.0,<6",
@@ -99,7 +99,7 @@ setup(
             "Flask>=1.0,<1.2",
             "hypothesis>=5.8,<5.30",
             "parver>=0.1,<2.0",
-            "pytest-asyncio>=0.10.0,<0.14",
+            "pytest-asyncio>=0.10.0,<0.14,!=0.14",
             "pytest-cov>=2.7.1,<3",
             "pytest-timeout>=1.3.3,<2",
             "pytest-xdist>=1.29,<2.2",

tox.ini

@@ -23,7 +23,7 @@ commands =
   bash -c "mitmdump --version 2>&1 | grep 'mitmproxy requires Python 3.6'"
 
 [testenv:flake8]
-deps = flake8==3.8
+deps = flake8==3.8.3
 commands =
   flake8 --jobs 8 mitmproxy pathod examples test release