diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index e7cd87f..b722b49 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -8,18 +8,18 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-    - name: Install ghostscript libmagickwand-dev
-      run: sudo apt-get install libxml2-utils
+    - name: Prepare for installations
+      run: sudo apt update -y
+    - name: Install Python
+      run: sudo apt install -y python3-pip python3-dev python3-venv
+    - name: Install ghostscript & imagemagick
+      run: sudo apt install -y ghostscript libmagickwand-dev
     - name: Remove policy.xml
       run: sudo rm /etc/ImageMagick-6/policy.xml
     - name: Check out repo
       uses: actions/checkout@v2
-    - name: Set up Python
-      uses: actions/setup-python@v1
-      with:
-        python-version: 3.8
-    - uses: actions/cache@v2
-      name: Configure pip caching
+    - name: Configure pip caching
+      uses: actions/cache@v2
       with:
         path: ~/.cache/pip
         key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt')}}-${{ hashFiles('**/requirements-dev.txt') }}
@@ -31,5 +31,5 @@ jobs:
       run: make check-flake
     - name: Run tests
       run: make tests
-    - name: Examine code coverage
+    - name: Upload code coverage
       uses: codecov/codecov-action@v1.0.12
diff --git a/Makefile b/Makefile
index b93b906..f740e6b 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@ PYTHON := venv/bin/python
 PIP = venv/bin/pip
 
 venv:
-	python -m venv venv
+	python3 -m venv venv
 	${PIP} install --upgrade pip
 	${PIP} install -r requirements.txt
 	${PIP} install -r requirements-dev.txt
diff --git a/pdfplumber/cli.py b/pdfplumber/cli.py
index 3b72193..1cf882c 100644
--- a/pdfplumber/cli.py
+++ b/pdfplumber/cli.py
@@ -48,3 +48,7 @@ def main(args_raw=sys.argv[1:]):
     kwargs = {"csv": {}, "json": {"indent": args.indent}}[args.format]
     with PDF.open(args.infile, pages=args.pages) as pdf:
         converter(pdf, sys.stdout, args.types, **kwargs)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/tests/test_convert.py b/tests/test_convert.py
index 0ebc8d8..8f5c481 100644
--- a/tests/test_convert.py
+++ b/tests/test_convert.py
@@ -58,7 +58,9 @@ class Test(unittest.TestCase):
 
     def test_cli(self):
         res = run([
-             "pdfplumber",
+             sys.executable,
+             "-m",
+             "pdfplumber.cli",
              self.path,
              "--format",
              "json",