drop 3.5

setup.cfg

@@ -27,7 +27,6 @@ classifiers =
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.6
-    Programming Language :: Python :: 3.5
     Programming Language :: Python :: Implementation :: CPython
     Topic :: Security
     Topic :: Security :: Cryptography
@@ -44,7 +43,7 @@ packages =
 install_requires =
     cryptography>=2.6,<38
     pyasn1
-python_requires = >=3.5
+python_requires = >=3.6
 
 # doc_requires =
 #    sphinx

tox.ini

@@ -30,7 +30,7 @@ install_command = pip install {opts} --no-cache-dir {packages}
 commands =
     py.test --cov pgpy --cov-report term-missing tests/
 
-[testenv:py{35,36,37,38,39}-setup]
+[testenv:py{36,37,38,39}-setup]
 recreate = True
 allowlist_externals =
     /usr/bin/rm