diff --git a/Cargo.lock b/Cargo.lock
index bbc6c8d1f..d23b9bb06 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -971,7 +971,7 @@ dependencies = [
 
 [[package]]
 name = "connectorx"
-version = "0.3.4-alpha.2"
+version = "0.4.0"
 dependencies = [
  "anyhow",
  "arrow",
@@ -1029,7 +1029,7 @@ dependencies = [
 
 [[package]]
 name = "connectorx-cpp"
-version = "0.3.4-alpha.2"
+version = "0.4.0"
 dependencies = [
  "arrow",
  "connectorx",
diff --git a/connectorx-cpp/Cargo.toml b/connectorx-cpp/Cargo.toml
index 131f1c0ef..4f147ac9f 100644
--- a/connectorx-cpp/Cargo.toml
+++ b/connectorx-cpp/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "connectorx-cpp"
-version = "0.3.4-alpha.2"
+version = "0.4.0"
 edition = "2021"
 license = "MIT"
 
diff --git a/connectorx-python/Cargo.lock b/connectorx-python/Cargo.lock
index c5bd46d2f..3b1d2f755 100644
--- a/connectorx-python/Cargo.lock
+++ b/connectorx-python/Cargo.lock
@@ -1000,7 +1000,7 @@ dependencies = [
 
 [[package]]
 name = "connectorx"
-version = "0.3.4-alpha.2"
+version = "0.4.0"
 dependencies = [
  "anyhow",
  "arrow",
@@ -1052,7 +1052,7 @@ dependencies = [
 
 [[package]]
 name = "connectorx-python"
-version = "0.3.4-alpha.2"
+version = "0.4.0"
 dependencies = [
  "anyhow",
  "arrow",
diff --git a/connectorx-python/Cargo.toml b/connectorx-python/Cargo.toml
index 72ba56ac0..cc95c7924 100644
--- a/connectorx-python/Cargo.toml
+++ b/connectorx-python/Cargo.toml
@@ -2,7 +2,7 @@
 authors = ["Weiyuan Wu <youngw@sfu.ca>"]
 edition = "2018"
 name = "connectorx-python"
-version = "0.3.4-alpha.2"
+version = "0.4.0"
 license = "MIT"
 readme = "README.md"
 
diff --git a/connectorx-python/pyproject.toml b/connectorx-python/pyproject.toml
index 066c5a460..c3fcc91a6 100644
--- a/connectorx-python/pyproject.toml
+++ b/connectorx-python/pyproject.toml
@@ -18,7 +18,7 @@ license = "MIT"
 maintainers = ["Weiyuan Wu <youngw@sfu.ca>"] 
 name = "connectorx" 
 readme = "README.md" # Markdown files are supported
-version = "0.3.4-alpha.2" 
+version = "0.4.0" 
 
 [project]
 name = "connectorx" # Target file name of maturin build
diff --git a/connectorx/Cargo.toml b/connectorx/Cargo.toml
index 434351386..0754b1fdd 100644
--- a/connectorx/Cargo.toml
+++ b/connectorx/Cargo.toml
@@ -7,7 +7,7 @@ license = "MIT"
 name = "connectorx"
 readme = "../README.md"
 repository = "https://github.com/sfu-db/connector-x"
-version = "0.3.4-alpha.2"
+version = "0.4.0"
 
 [dependencies]
 anyhow = "1"