diff --git a/Cargo.lock b/Cargo.lock
index 44ab7de..3cbf106 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -284,7 +284,7 @@ dependencies = [
 
 [[package]]
 name = "database-tree"
-version = "0.1.0-alpha.3"
+version = "0.1.0-alpha.4"
 dependencies = [
  "anyhow",
  "chrono",
diff --git a/Cargo.toml b/Cargo.toml
index 5b0b573..d0373c4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -29,7 +29,7 @@ serde = "1.0"
 toml = "0.4"
 strum = "0.21"
 strum_macros = "0.21"
-database-tree = { path = "./database-tree", version = "0.1.0-alpha.3" }
+database-tree = { path = "./database-tree", version = "0.1.0-alpha.4" }
 easy-cast = "0.4"
 async-trait = "0.1.50"
 itertools = "0.10.0"
diff --git a/database-tree/Cargo.toml b/database-tree/Cargo.toml
index 05fef9d..ec9c5ba 100644
--- a/database-tree/Cargo.toml
+++ b/database-tree/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "database-tree"
-version = "0.1.0-alpha.3"
+version = "0.1.0-alpha.4"
 authors = ["Takayuki Maeda <takoyaki0316@gmail.com>"]
 edition = "2018"
 license = "MIT"