diff --git a/Cargo.toml b/Cargo.toml
index 15cad43..c9a2616 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "imgui"
-version = "0.0.19"
+version = "0.0.20-pre"
 authors = ["Joonas Javanainen <joonas.javanainen@gmail.com>", "imgui-rs contributors"]
 description = "High-level Rust bindings to dear imgui"
 homepage = "https://github.com/Gekkio/imgui-rs"
@@ -13,7 +13,7 @@ readme = "README.markdown"
 travis-ci = { repository = "Gekkio/imgui-rs" }
 
 [dependencies]
-imgui-sys = { version = "0.0.19", path = "imgui-sys" }
+imgui-sys = { version = "0.0.20-pre", path = "imgui-sys" }
 
 [workspace]
 members = ["imgui-examples", "imgui-sys", "imgui-gfx-renderer", "imgui-glium-renderer"]
diff --git a/imgui-examples/Cargo.toml b/imgui-examples/Cargo.toml
index c6ea179..d992072 100644
--- a/imgui-examples/Cargo.toml
+++ b/imgui-examples/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "imgui-examples"
-version = "0.0.19"
+version = "0.0.20-pre"
 authors = ["Joonas Javanainen <joonas.javanainen@gmail.com>", "imgui-rs contributors"]
 description = "imgui crate examples"
 homepage = "https://github.com/Gekkio/imgui-rs"
@@ -13,6 +13,6 @@ gfx = "0.17"
 gfx_window_glutin = "0.26"
 glium = { version = "0.22", default-features = true }
 glutin = "0.18"
-imgui = { version = "0.0.19", path = "../" }
-imgui-gfx-renderer = { version = "0.0.19", path = "../imgui-gfx-renderer" }
-imgui-glium-renderer = { version = "0.0.19", path = "../imgui-glium-renderer" }
+imgui = { version = "0.0.20-pre", path = "../" }
+imgui-gfx-renderer = { version = "0.0.20-pre", path = "../imgui-gfx-renderer" }
+imgui-glium-renderer = { version = "0.0.20-pre", path = "../imgui-glium-renderer" }
diff --git a/imgui-gfx-renderer/Cargo.toml b/imgui-gfx-renderer/Cargo.toml
index 94d333a..7ae8825 100644
--- a/imgui-gfx-renderer/Cargo.toml
+++ b/imgui-gfx-renderer/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "imgui-gfx-renderer"
-version = "0.0.19"
+version = "0.0.20-pre"
 authors = ["Joonas Javanainen <joonas.javanainen@gmail.com>", "imgui-rs contributors"]
 description = "gfx renderer for the imgui crate"
 homepage = "https://github.com/Gekkio/imgui-rs"
@@ -13,5 +13,5 @@ travis-ci = { repository = "Gekkio/imgui-rs" }
 
 [dependencies]
 gfx = "0.17"
-imgui = { version = "0.0.19", path = "../" }
-imgui-sys = { version = "0.0.19", path = "../imgui-sys", features = ["gfx"] }
+imgui = { version = "0.0.20-pre", path = "../" }
+imgui-sys = { version = "0.0.20-pre", path = "../imgui-sys", features = ["gfx"] }
diff --git a/imgui-glium-renderer/Cargo.toml b/imgui-glium-renderer/Cargo.toml
index b43cf1a..495f267 100644
--- a/imgui-glium-renderer/Cargo.toml
+++ b/imgui-glium-renderer/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "imgui-glium-renderer"
-version = "0.0.19"
+version = "0.0.20-pre"
 authors = ["Joonas Javanainen <joonas.javanainen@gmail.com>", "imgui-rs contributors"]
 description = "Glium renderer for the imgui crate"
 homepage = "https://github.com/Gekkio/imgui-rs"
@@ -13,5 +13,5 @@ travis-ci = { repository = "Gekkio/imgui-rs" }
 
 [dependencies]
 glium = { version = "0.22", default-features = false }
-imgui = { version = "0.0.19", path = "../" }
-imgui-sys = { version = "0.0.19", path = "../imgui-sys", features = ["glium"] }
+imgui = { version = "0.0.20-pre", path = "../" }
+imgui-sys = { version = "0.0.20-pre", path = "../imgui-sys", features = ["glium"] }
diff --git a/imgui-sys/Cargo.toml b/imgui-sys/Cargo.toml
index 23bf63e..4b15946 100644
--- a/imgui-sys/Cargo.toml
+++ b/imgui-sys/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "imgui-sys"
-version = "0.0.19"
+version = "0.0.20-pre"
 authors = ["Joonas Javanainen <joonas.javanainen@gmail.com>", "imgui-rs contributors"]
 description = "Raw FFI bindings to dear imgui"
 homepage = "https://github.com/Gekkio/imgui-rs"