diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 04d2ab9..eb80118 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -10,7 +10,7 @@ jobs:
       max-parallel: 4
       matrix:
         # Up to date compatibility matrix
-        python-version: [2.7, 3.5, 3.6, 3.7, 3.8]
+        python-version: [3.7, 3.8, 3.9, "3.10"]
         os: [ubuntu-latest, windows-latest]
 
     steps:
@@ -20,8 +20,6 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
-      env:
-        DJANGO_VERSION: ${{ matrix.django-version }}
       run: |
         python -m pip install --upgrade pip
         make testenv
diff --git a/Makefile b/Makefile
index 77d627f..de73690 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@ testenv:
 	pip install -e .
 
 test:
-	nosetests --with-coverage --cover-erase --cover-branches --cover-package=clinto clinto/tests/*
+	pytest --cov=clinto --cov-config=.coveragerc clinto/tests/*
 	coverage report --omit='clinto/tests*'
 	coverage xml --omit='clinto/tests*'
 
diff --git a/clinto/parsers/argparse_.py b/clinto/parsers/argparse_.py
index be3cec3..a2bad59 100644
--- a/clinto/parsers/argparse_.py
+++ b/clinto/parsers/argparse_.py
@@ -337,7 +337,27 @@ def extract_parser(self):
             try:
                 ast_source = source_parser.parse_source_file(self.script_path)
                 python_code = source_parser.convert_to_python(list(ast_source))
+                f.write(six.b("""
+import builtins
+from types import ModuleType
+
+class DummyModule(ModuleType):
+    def __getattr__(self, key):
+        return None
+    __all__ = []   # support wildcard imports
+
+def tryimport(name, globals={}, locals={}, fromlist=[], level=-1):
+    try:
+        return realimport(name, globals, locals, fromlist, level)
+    except (ImportError, ModuleNotFoundError):
+        return DummyModule(name)
+
+realimport, builtins.__import__ = builtins.__import__, tryimport
+"""))
                 f.write(six.b("\n".join(python_code)))
+                f.write(six.b("""
+builtins.__import__ = realimport
+"""))
                 f.seek(0)
                 module = imp.load_source("__main__", f.name)
             except Exception:
diff --git a/requirements.txt b/requirements.txt
index 4cd1c0f..3650850 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,3 @@
 coveralls
-nose
+pytest
+pytest-cov
diff --git a/tox.ini b/tox.ini
deleted file mode 100644
index 2a37a14..0000000
--- a/tox.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[tox]
-envlist = py27,py35,py36
-[testenv]
-deps=nose
-commands=nosetests