diff --git a/pdm.lock b/pdm.lock
index 56ee2df0..2e649f45 100644
--- a/pdm.lock
+++ b/pdm.lock
@@ -4,8 +4,8 @@
 [metadata]
 groups = ["default"]
 strategy = ["cross_platform"]
-lock_version = "4.4"
-content_hash = "sha256:377060918126987ee7854a1767311674ff9e2710607aaacf0de88245cf78b1cb"
+lock_version = "4.4.1"
+content_hash = "sha256:c1a5d1e22693f74c3174d55040fa95f5517b735391c8b4c2eced81269267fad9"
 
 [[package]]
 name = "anyio"
@@ -549,6 +549,16 @@ files = [
     {file = "typing_extensions-4.9.0.tar.gz", hash = "sha256:23478f88c37f27d76ac8aee6c905017a143b0b1b886c3c9f66bc2fd94f9f5783"},
 ]
 
+[[package]]
+name = "urllib3"
+version = "2.1.0"
+requires_python = ">=3.8"
+summary = "HTTP library with thread-safe connection pooling, file post, and more."
+files = [
+    {file = "urllib3-2.1.0-py3-none-any.whl", hash = "sha256:55901e917a5896a349ff771be919f8bd99aff50b79fe58fec595eb37bbc56bb3"},
+    {file = "urllib3-2.1.0.tar.gz", hash = "sha256:df7aa8afb0148fa78488e7899b2c59b5f4ffcfa82e6c54ccb9dd37c1d7b52d54"},
+]
+
 [[package]]
 name = "werkzeug"
 version = "3.0.1"
diff --git a/pyproject.toml b/pyproject.toml
index 17b4eef6..341843a4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,6 +14,8 @@ dependencies = [
     "pymysql>=1.1.0",
     "click>=8.1.7",
     "bson>=0.5.10",
+    "jwt>=1.3.1",
+    "urllib3>=2.1.0",
 ]
 requires-python = ">=3.10"
 readme = "README.md"
diff --git a/requirements.txt b/requirements.txt
index f16db853..acb280ed 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -34,4 +34,5 @@ six==1.16.0
 sniffio==1.3.0
 sqlalchemy==2.0.23
 typing-extensions==4.9.0
+urllib3==2.1.0
 Werkzeug==3.0.1
diff --git a/server/routes/github.py b/server/routes/github.py
index f3b5af6b..07c9d1b5 100644
--- a/server/routes/github.py
+++ b/server/routes/github.py
@@ -9,6 +9,13 @@
 
 @bp.route("/install", methods=["GET"])
 def github_install():
+    """Install GitHub App.
+
+    If not `installation_id`, redirect to install page.
+    If `installation_id`, get installation token.
+
+    If `code`, register by code.
+    """
     installation_id = request.args.get("installation_id", None)
 
     if installation_id is None:
@@ -46,4 +53,26 @@ def github_install():
     return "Success!"
 
 
+@bp.route("/register", methods=["GET"])
+def github_register():
+    """GitHub OAuth register.
+
+    If not `code`, redirect to GitHub OAuth page.
+    If `code`, register by code.
+    """
+    code = request.args.get("code", None)
+    if code is None:
+        return redirect(
+            f"https://github.com/login/oauth/authorize?client_id={os.environ.get('GITHUB_CLIENT_ID')}"
+        )
+
+    print(f"code: {code}")
+    user_token = register_by_code(code)
+    if user_token is None:
+        return "Failed to register by code."
+
+    print(f"user_token: {user_token}")
+    return user_token
+
+
 app.register_blueprint(bp)
diff --git a/server/utils/github.py b/server/utils/github.py
index e9eff48f..044c6b15 100644
--- a/server/utils/github.py
+++ b/server/utils/github.py
@@ -1,5 +1,6 @@
 import os
 import time
+from urllib.parse import parse_qs
 
 import httpx
 from jwt import JWT, jwk_from_pem
@@ -79,14 +80,16 @@ def register_by_code(code: str) -> str | None:
         response = client.post(
             "https://github.com/login/oauth/access_token",
             params={
-                "client_id": os.environ.get("CLIENT_ID"),
-                "client_secret": os.environ.get("CLIENT_SECRET"),
+                "client_id": os.environ.get("GITHUB_CLIENT_ID"),
+                "client_secret": os.environ.get("GITHUB_CLIENT_SECRET"),
                 "code": code,
             },
         )
-        if response.status_code == 200:
+        if response.status_code != 200:
             return None
 
-        return response.text
+        access_token = parse_qs(response.text).get("access_token", None)
+        if access_token is not None:
+            return access_token[0]
 
     return None