diff --git a/Cargo.toml b/Cargo.toml
index c3ac1f8..c30a168 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "exif"
-version = "0.3.1"
+version = "0.4.0"
 authors = ["KAMADA Ken'ichi <kamada@nanohz.org>"]
 edition = "2018"
 
diff --git a/README b/README
index 04a25d8..89b70f6 100644
--- a/README
+++ b/README
@@ -13,7 +13,7 @@ Usage
    but it is renamed on crates.io to avoid a naming conflict.
 
       [dependencies]
-      kamadak-exif = "0.3"
+      kamadak-exif = "0.4"
 
    Add the following to your crate root (before Rust 2018).