diff --git a/.gitignore b/.gitignore
index bec120d..be73e67 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,7 @@
-.DS_Store
 _*.sh
 _*.txt
+.DS_Store
+.pre-commit-config.yaml
 *.bak
 *.egg-info
 *.pyc
@@ -11,4 +12,6 @@ bin/
 build/
 dist/
 examples/
+issues/
+misc/
 venv/
diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..7f44661
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,11 @@
+{
+    "cSpell.ignoreWords": [
+        "aarch",
+        "cmdclass",
+        "outfiles",
+        "pypi"
+    ],
+    "files.trimFinalNewlines": true,
+    "files.insertFinalNewline": true,
+    "files.trimTrailingWhitespace": true
+}
diff --git a/LICENSE b/LICENSE
index 907ccc0..7754bd9 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,9 @@
-The MIT License (MIT)
+Original "https://github.com/shellcheck-py/shellcheck-py" Project License
+=========================================================================
 
-Copyright (c) 2019 Marco M.
+MIT License
+
+Copyright (c) 2019 Ryan Rhee
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/run-tests.sh b/run-tests.sh
index 502b91c..029e14e 100755
--- a/run-tests.sh
+++ b/run-tests.sh
@@ -2,57 +2,64 @@
 
 set -e
 
-PY_DOCKER_IMAGES=("2.7.16-slim" "3.7.4-slim")
 DOCKERFILE_TEMPLATE="tests/Dockerfile.template"
 
-PACKAGES=()
+PY_DOCKER_IMAGES=()
+PY_DOCKER_IMAGES+=("2.7.16-slim")
+PY_DOCKER_IMAGES+=("3.7.4-slim")
+PY_DOCKER_IMAGES+=("3.8-slim")
+PY_DOCKER_IMAGES+=("3.9-slim")
+PY_DOCKER_IMAGES+=("3.10-slim")
+PY_DOCKER_IMAGES+=("3.11-slim")
 
-# Install packages from sources
-PACKAGES+=(".")
-# PyPI package
-PACKAGES+=("editorconfig-checker")
+create_docker_file() {
+    local package="$1"
 
-echo -e "Running tests...\n\n"
+    # Generate a valid Dockerfile from a template file
+    local dockerfile="tests/Dockerfile-$py_docker_image-$package"
+    cp "$DOCKERFILE_TEMPLATE" "$dockerfile"
 
-for py_docker_image in "${PY_DOCKER_IMAGES[@]}"; do
-    for package in "${PACKAGES[@]}"; do
-        is_local="0"
-        if [[ "$package" == "." ]]; then
-            package_pp="local"
-            is_local="1"
-        elif [[ "$package" == "editorconfig-checker" ]]; then
-            package_pp="pypi"
-        else
-            echo "Unknown package '$package'. Valid values are '.' and 'editorconfig-checker'."
-            exit 1
-        fi
+    # Replace docker image
+    sed -i "s/\$IMAGE/$py_docker_image/g" "$dockerfile"
 
-        echo "docker image: $py_docker_image ~ package: $package ($package_pp)"
+    # Replace package name
+    if [[ "$package" == "local" ]]; then
+        package="."
+    fi
+    sed -i "s/\$PACKAGE/$package/g" "$dockerfile"
 
-        # Generate a valid Dockerfile from a template file
-        dockerfile="tests/Dockerfile-$py_docker_image-$package_pp"
-        cp "$DOCKERFILE_TEMPLATE" "$dockerfile"
-        sed -i "s/\$IMAGE/$py_docker_image/g" "$dockerfile"
-        sed -i "s/\$PACKAGE/$package/g"       "$dockerfile"
+    echo "$dockerfile"
+}
 
-        echo "Building docker image based on \"$dockerfile\". It could take some time..."
+build_docker_image_and_run() {
+    local py_docker_image="$1"
+    local package="$2"
+    local dockerfile="$3"
 
-        # Build & run
-        docker_image="editorconfig-checker-$py_docker_image-$package_pp:latest"
-        docker build -t "$docker_image" -f "$dockerfile" --no-cache --quiet .
-        docker run --rm "$docker_image"
+    # Build
+    local docker_image="editorconfig-checker-$py_docker_image-$package:latest"
+    docker build -t "$docker_image" -f "$dockerfile" --no-cache --quiet .
 
-        # Run coding style tools
-        if [[ "$is_local" == "1" ]]; then
-            docker run --rm "$docker_image" make coding-style
-        fi
+    # Run `editorconfig-checker`
+    docker run --rm "$docker_image" ec -version
+}
 
-        # Run `editorconfig-checker`
-        docker run --rm "$docker_image" ec -version
+main() {
+    echo -e "Running tests...\n\n"
 
-        # Remove the created image
-        docker image rm "$docker_image" &> /dev/null
+    for py_docker_image in "${PY_DOCKER_IMAGES[@]}"; do
+        for package in local editorconfig-checker; do
+            local dockerfile=$(create_docker_file "$package")
+            echo "Dockerfile created at \"$dockerfile\" (\"$py_docker_image\" image and \"$package\" package)"
 
-        echo -e "\n"
+            echo "Building docker image. It could take some time..."
+            build_docker_image_and_run "$py_docker_image" "$package" "$dockerfile"
+
+            # docker image rm "$docker_image" &> /dev/null
+
+            echo -e "\n"
+        done
     done
-done
+}
+
+main
diff --git a/setup.py b/setup.py
index 7aabada..053c8fd 100644
--- a/setup.py
+++ b/setup.py
@@ -2,7 +2,7 @@
 # -*- coding: utf-8 -*-
 
 """
-This setup logic is highly ispired to the one used in `https://github.com/shellcheck-py/shellcheck-py`.
+This setup logic is highly inspired to the one used in `https://github.com/shellcheck-py/shellcheck-py`.
 
 After `https://github.com/editorconfig-checker/editorconfig-checker.python/issues/15` was opened,
 we decided to move the wrapper logic directly in the setup phase.
@@ -13,15 +13,16 @@
 Once the setup is complete, the `ec` executable should be available on your machine.
 """
 
-from io import BytesIO
 from distutils.command.build import build as orig_build
 from distutils.core import Command
+from io import BytesIO
 from os import chmod, makedirs, path, stat
 from platform import architecture, machine, system
+from stat import S_IXGRP, S_IXOTH, S_IXUSR
+from tarfile import open as tarfile_open
+
 from setuptools import setup
 from setuptools.command.install import install as orig_install
-from stat import S_IXUSR, S_IXGRP, S_IXOTH
-from tarfile import open as tarfile_open
 
 try:
     # Python 3
@@ -31,8 +32,8 @@
     from urllib2 import urlopen
 
 
-WRAPPER_VERSION = '2.7.2'
-EDITORCONFIG_CHECKER_CORE_VERSION = '2.7.0'
+WRAPPER_VERSION = '2.7.3'
+EDITORCONFIG_CHECKER_CORE_VERSION = '2.7.1'
 EDITORCONFIG_CHECKER_EXE_NAME = 'ec'
 
 
@@ -88,10 +89,10 @@ def download_tarball(url):
 def extract_tarball(url, data):
     with BytesIO(data) as bio:
         if '.tar.' in url:
-            with tarfile_open(fileobj=bio) as tarf:
-                for info in tarf.getmembers():
+            with tarfile_open(fileobj=bio) as fp:
+                for info in fp.getmembers():
                     if info.isfile() and info.name.startswith('bin/ec-'):
-                        return tarf.extractfile(info).read()
+                        return fp.extractfile(info).read()
 
     raise AssertionError('unreachable `extract` function')
 
@@ -102,7 +103,12 @@ def save_executables(data, base_dir):
         exe += '.exe'
 
     output_path = path.join(base_dir, exe)
-    makedirs(base_dir)
+    try:
+        # Python 3
+        makedirs(base_dir, exist_ok=True)
+    except TypeError:
+        # Python 2.7
+        makedirs(base_dir)
 
     with open(output_path, 'wb') as fp:
         fp.write(data)
diff --git a/tests/Dockerfile.template b/tests/Dockerfile.template
index 3e18d77..92d8138 100644
--- a/tests/Dockerfile.template
+++ b/tests/Dockerfile.template
@@ -6,9 +6,7 @@ LABEL maintainer="Marco M. (mmicu) <mmicu.github00@gmail.com>"
 COPY . /app
 WORKDIR /app
 
-RUN set -x                                   \
-    && apt-get update                        \
-    && apt-get install -y make               \
-    && python -m pip install --upgrade pip   \
-    && pip install -r tests/requirements.txt \
+RUN apt-get update                         \
+    && apt-get install -y make             \
+    && python -m pip install --upgrade pip \
     && pip install --no-cache-dir $PACKAGE
diff --git a/tests/requirements.txt b/tests/requirements.txt
deleted file mode 100644
index 3930480..0000000
--- a/tests/requirements.txt
+++ /dev/null
@@ -1 +0,0 @@
-flake8