diff --git a/Cargo.lock b/Cargo.lock
index 99ca9c0a..c3b04fa9 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2030,7 +2030,7 @@ dependencies = [
 
 [[package]]
 name = "sqlx"
-version = "0.3.5"
+version = "0.4.0-pre"
 dependencies = [
  "anyhow",
  "async-std",
@@ -2051,7 +2051,7 @@ dependencies = [
 
 [[package]]
 name = "sqlx-cli"
-version = "0.0.1"
+version = "0.1.0-pre"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -2072,7 +2072,7 @@ dependencies = [
 
 [[package]]
 name = "sqlx-core"
-version = "0.3.5"
+version = "0.4.0-pre"
 dependencies = [
  "async-stream",
  "atoi",
@@ -2195,7 +2195,7 @@ dependencies = [
 
 [[package]]
 name = "sqlx-macros"
-version = "0.3.5"
+version = "0.4.0-pre"
 dependencies = [
  "async-std",
  "dotenv",
diff --git a/Cargo.toml b/Cargo.toml
index 0c1a15f8..8759e670 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,7 +15,7 @@ members = [
 
 [package]
 name = "sqlx"
-version = "0.3.5"
+version = "0.4.0-pre"
 license = "MIT OR Apache-2.0"
 readme = "README.md"
 repository = "https://github.com/launchbadge/sqlx"
@@ -66,8 +66,8 @@ json = [ "sqlx-core/json", "sqlx-macros/json" ]
 time = [ "sqlx-core/time", "sqlx-macros/time" ]
 
 [dependencies]
-sqlx-core = { version = "0.3.5", path = "sqlx-core", default-features = false }
-sqlx-macros = { version = "0.3.5", path = "sqlx-macros", default-features = false, optional = true }
+sqlx-core = { version = "0.4.0-pre", path = "sqlx-core", default-features = false }
+sqlx-macros = { version = "0.4.0-pre", path = "sqlx-macros", default-features = false, optional = true }
 
 [dev-dependencies]
 anyhow = "1.0.26"
diff --git a/sqlx-cli/Cargo.toml b/sqlx-cli/Cargo.toml
index 8e374831..230af00f 100644
--- a/sqlx-cli/Cargo.toml
+++ b/sqlx-cli/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "sqlx-cli"
-version = "0.0.1"
+version = "0.1.0-pre"
 description = "Command-line utility for SQLx, the Rust SQL toolkit."
 edition = "2018"
 readme = "README.md"
@@ -27,7 +27,7 @@ path = "src/bin/cargo-sqlx.rs"
 [dependencies]
 dotenv = "0.15"
 tokio = { version = "0.2", features = ["macros"] }
-sqlx = { version = "0.3", path = "..", default-features = false, features = [ "runtime-tokio", "offline" ] }
+sqlx = { version = "0.4.0-pre", path = "..", default-features = false, features = [ "runtime-tokio", "offline" ] }
 futures = "0.3"
 structopt = "0.3"
 chrono = "0.4"
diff --git a/sqlx-core/Cargo.toml b/sqlx-core/Cargo.toml
index 6b267800..875d6107 100644
--- a/sqlx-core/Cargo.toml
+++ b/sqlx-core/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "sqlx-core"
-version = "0.3.5"
+version = "0.4.0-pre"
 repository = "https://github.com/launchbadge/sqlx"
 description = "Core of SQLx, the rust SQL toolkit. Not intended to be used directly."
 license = "MIT OR Apache-2.0"
diff --git a/sqlx-macros/Cargo.toml b/sqlx-macros/Cargo.toml
index 65939f21..4137a8fd 100644
--- a/sqlx-macros/Cargo.toml
+++ b/sqlx-macros/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "sqlx-macros"
-version = "0.3.5"
+version = "0.4.0-pre"
 repository = "https://github.com/launchbadge/sqlx"
 description = "Macros for SQLx, the rust SQL toolkit. Not intended to be used directly."
 license = "MIT OR Apache-2.0"
@@ -45,7 +45,7 @@ futures = { version = "0.3.4", default-features = false, features = [ "executor"
 hex = { version = "0.4.2", optional = true }
 heck = "0.3"
 proc-macro2 = { version = "1.0.9", default-features = false }
-sqlx-core = { version = "0.3.5", default-features = false, path = "../sqlx-core" }
+sqlx-core = { version = "0.4.0-pre", default-features = false, path = "../sqlx-core" }
 serde = { version = "1.0", optional = true }
 serde_json = { version = "1.0", features = [ "preserve_order" ], optional = true }
 sha2 = { version = "0.8.1", optional = true }