diff --git a/Cargo.toml b/Cargo.toml
index 195cd72..f7d09ef 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "imgui"
-version = "0.3.0"
+version = "0.4.0-pre"
 edition = "2018"
 authors = ["Joonas Javanainen <joonas.javanainen@gmail.com>", "imgui-rs contributors"]
 description = "High-level Rust bindings to dear imgui"
@@ -18,7 +18,7 @@ exclude = [
 bitflags = "1.0"
 glium = { version = "0.26", default-features = false, optional = true }
 gfx = { version = "0.18", optional = true }
-imgui-sys = { version = "0.3.0", path = "imgui-sys" }
+imgui-sys = { version = "0.4.0-pre", path = "imgui-sys" }
 lazy_static = "1.1"
 parking_lot = "0.10"
 
diff --git a/imgui-gfx-renderer/Cargo.toml b/imgui-gfx-renderer/Cargo.toml
index aa38014..a53f5a8 100644
--- a/imgui-gfx-renderer/Cargo.toml
+++ b/imgui-gfx-renderer/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "imgui-gfx-renderer"
-version = "0.3.0"
+version = "0.4.0-pre"
 edition = "2018"
 authors = ["Joonas Javanainen <joonas.javanainen@gmail.com>", "imgui-rs contributors"]
 description = "gfx renderer for the imgui crate"
@@ -16,7 +16,7 @@ default = ["opengl"]
 
 [dependencies]
 gfx = "0.18"
-imgui = { version = "0.3.0", path = "../", features = ["gfx"] }
+imgui = { version = "0.4.0-pre", path = "../", features = ["gfx"] }
 
 [target.'cfg(windows)'.build-dependencies]
 winapi = { version = "0.3", features = ["d3dcompiler"] }
diff --git a/imgui-glium-renderer/Cargo.toml b/imgui-glium-renderer/Cargo.toml
index 5677567..832489a 100644
--- a/imgui-glium-renderer/Cargo.toml
+++ b/imgui-glium-renderer/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "imgui-glium-renderer"
-version = "0.3.0"
+version = "0.4.0-pre"
 edition = "2018"
 authors = ["Joonas Javanainen <joonas.javanainen@gmail.com>", "imgui-rs contributors"]
 description = "Glium renderer for the imgui crate"
@@ -11,4 +11,4 @@ categories = ["gui", "rendering"]
 
 [dependencies]
 glium = { version = "0.26", default-features = false }
-imgui = { version = "0.3.0", path = "../", features = ["glium"] }
+imgui = { version = "0.4.0-pre", path = "../", features = ["glium"] }
diff --git a/imgui-sys/Cargo.toml b/imgui-sys/Cargo.toml
index 44b2ed3..2712d02 100644
--- a/imgui-sys/Cargo.toml
+++ b/imgui-sys/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "imgui-sys"
-version = "0.3.0"
+version = "0.4.0-pre"
 edition = "2018"
 authors = ["Joonas Javanainen <joonas.javanainen@gmail.com>", "imgui-rs contributors"]
 description = "Raw FFI bindings to dear imgui"
diff --git a/imgui-winit-support/Cargo.toml b/imgui-winit-support/Cargo.toml
index c6477bf..de8b948 100644
--- a/imgui-winit-support/Cargo.toml
+++ b/imgui-winit-support/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "imgui-winit-support"
-version = "0.3.0"
+version = "0.4.0-pre"
 edition = "2018"
 authors = ["Joonas Javanainen <joonas.javanainen@gmail.com>", "imgui-rs contributors"]
 description = "winit support code for the imgui crate"
@@ -10,7 +10,7 @@ license = "MIT/Apache-2.0"
 categories = ["gui"]
 
 [dependencies]
-imgui = { version = "0.3.0", path = "../" }
+imgui = { version = "0.4.0-pre", path = "../" }
 winit-19 = { version = ">= 0.16, <= 0.19", package = "winit", optional = true }
 winit-20 = { version = ">= 0.20", package = "winit", optional = true }