diff --git a/gppt/__init__.py b/gppt/__init__.py
index 546d1e2..37de408 100644
--- a/gppt/__init__.py
+++ b/gppt/__init__.py
@@ -9,7 +9,7 @@
     ProfileURIs,
 )
 
-__version__ = "3.1.2"
+__version__ = "4.0.0"
 
 __all__ = [
     "PixivAuth",
diff --git a/pyproject.toml b/pyproject.toml
index f00c42c..e42fd2e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,7 +21,7 @@ packages = [{include = "gppt"}]
 license = "MIT"
 readme = "README.md"
 repository = "https://github.com/eggplants/get-pixivpy-token"
-version = "3.1.2"
+version = "4.0.0"
 
 [tool.poetry.dependencies]
 python = ">=3.8,<4"