diff --git a/README.md b/README.md
index 0776efc..a1eda1b 100644
--- a/README.md
+++ b/README.md
@@ -47,8 +47,8 @@ Clock.schedule_interval(clock.tick, 0)
 Pin the minor version.
 
 ```
-poetry add asyncgui-ext-clock@~0.3
-pip install "asyncgui-ext-clock>=0.3,<0.4"
+poetry add asyncgui-ext-clock@~0.4
+pip install "asyncgui-ext-clock>=0.4,<0.5"
 ```
 
 ## Tested on
diff --git a/pyproject.toml b/pyproject.toml
index 2757a9b..072d8a0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "asyncgui-ext-clock"
-version = "0.4.0.dev0"
+version = "0.4.0"
 description = "An event scheduler for asyncgui programs"
 authors = ["Nattōsai Mitō <flow4re2c@gmail.com>"]
 license = "MIT"
diff --git a/sphinx/readme_jp.rst b/sphinx/readme_jp.rst
index 6ea74a7..7afe1b5 100644
--- a/sphinx/readme_jp.rst
+++ b/sphinx/readme_jp.rst
@@ -55,8 +55,8 @@ APIに渡す時間の単位は統一さえされていれば何でも構いま
 
 ::
 
-    poetry add asyncgui-ext-clock@~0.3
-    pip install "asyncgui-ext-clock>=0.3,<0.4"
+    poetry add asyncgui-ext-clock@~0.4
+    pip install "asyncgui-ext-clock>=0.4,<0.5"
 
 テスト環境
 -----------------------