diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 879f3c9..4a24d33 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -31,9 +31,8 @@ jobs:
     - name: Install dependencies
       run: |
         pip install --upgrade pip
-        pip install setuptools==57.5.0
-        pip install -r dev-requirement.txt
-        pip install .
+        pip install setuptools -U
+        pip install .[dev]
 
     - name: Lint with flake8
       run: |
diff --git a/dev-requirement.txt b/dev-requirement.txt
deleted file mode 100644
index 1d76b9a..0000000
--- a/dev-requirement.txt
+++ /dev/null
@@ -1,6 +0,0 @@
--r requirement.txt
-isort==5.10.1
-black==22.8.0
-pytest==6.2.5
-ipython==7.16.3
-flake8==4.0.1
\ No newline at end of file
diff --git a/pyencrypt/cli.py b/pyencrypt/cli.py
index 3cb0275..3dd182b 100644
--- a/pyencrypt/cli.py
+++ b/pyencrypt/cli.py
@@ -25,7 +25,7 @@
         {__description__}
 
                     VERSION {__version__}
-"""
+"""  # noqa: E221,E222
 
 KEY_OPTION_HELP = """
 Your encryption key.If you don't specify key,
@@ -52,8 +52,8 @@
 Encryption completed {SUCCESS_ANSI}.
 Please copy {LOADER_FILE_NAME} into your encrypted directory.
 And then remove `encrypted` directory.
-Finally, add `import loader` at the top of your entry file.\
-"""
+Finally, add `import loader` at the top of your entry file.\n
+"""  # noqa: W604
 
 FINISH_DECRYPT_MSG = f"""
 Decryption completed {SUCCESS_ANSI}. Your origin source code has be put: {{work_dir}}
diff --git a/pyencrypt/license.py b/pyencrypt/license.py
index 9a31aed..67d326a 100644
--- a/pyencrypt/license.py
+++ b/pyencrypt/license.py
@@ -35,7 +35,7 @@ def get_signature(data: bytes) -> str:
 
 
 def _combine_data(data: dict) -> bytes:
-    return "*".join(map(lambda x: f"{x}:{data[x]}", FIELDS)).encode()
+    return "*".join(map(lambda x: f"{x}:{data[x]}", FIELDS)).encode()  # noqa: E231
 
 
 def generate_license_file(
diff --git a/pyencrypt/loader.py b/pyencrypt/loader.py
index 4d28cb1..069010e 100644
--- a/pyencrypt/loader.py
+++ b/pyencrypt/loader.py
@@ -78,9 +78,9 @@ def find_spec(
     ) -> ModuleSpec:
         if path:
             if isinstance(path, _NamespacePath):
-                file_path = Path(path._path[0]) / f'{fullname.rsplit(".",1)[-1]}.pye'
+                file_path = Path(path._path[0]) / f'{fullname.rsplit(".", 1)[-1]}.pye'
             else:
-                file_path = Path(path[0]) / f'{fullname.rsplit(".",1)[-1]}.pye'
+                file_path = Path(path[0]) / f'{fullname.rsplit(".", 1)[-1]}.pye'
         else:
             for p in sys.path:
                 file_path = Path(p) / f"{fullname}.pye"
diff --git a/requirement.txt b/requirement.txt
deleted file mode 100644
index 112162c..0000000
--- a/requirement.txt
+++ /dev/null
@@ -1,4 +0,0 @@
-click==8.0.3
-Cython==0.29.24
-pycryptodome==3.14.1
-python-minifier==2.9.0
\ No newline at end of file
diff --git a/setup.cfg b/setup.cfg
index e3432b2..aecc818 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -40,6 +40,14 @@ packages = find:
 # package_dir =
 #     = src
 
+[options.extras_require]
+dev:
+    isort
+    black
+    pytest
+    ipython
+    flake8
+
 [options.packages.find]
 # where = src
 exclude =