diff --git a/Cargo.lock b/Cargo.lock
index 59f85958e5..df09cb055f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -942,7 +942,7 @@ dependencies = [
 
 [[package]]
 name = "pen"
-version = "0.6.5"
+version = "0.6.6"
 dependencies = [
  "app",
  "clap",
diff --git a/cmd/pen/Cargo.toml b/cmd/pen/Cargo.toml
index b0f06b6034..c212408e07 100644
--- a/cmd/pen/Cargo.toml
+++ b/cmd/pen/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "pen"
-version = "0.6.5"
+version = "0.6.6"
 authors = ["Yota Toyama <raviqqe@gmail.com>"]
 edition = "2021"