diff --git a/Cargo.lock b/Cargo.lock
index 1411873..f4e2369 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -215,7 +215,7 @@ dependencies = [
 
 [[package]]
 name = "colmena"
-version = "0.4.0"
+version = "0.5.0-pre"
 dependencies = [
  "async-stream",
  "async-trait",
diff --git a/Cargo.toml b/Cargo.toml
index da800b5..d1215f2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "colmena"
-version = "0.4.0"
+version = "0.5.0-pre"
 authors = ["Zhaofeng Li <hello@zhaofeng.li>"]
 edition = "2021"
 
diff --git a/package.nix b/package.nix
index 40a395e..bb4142f 100644
--- a/package.nix
+++ b/package.nix
@@ -2,7 +2,7 @@
 
 rustPlatform.buildRustPackage rec {
   pname = "colmena";
-  version = "0.4.0";
+  version = "0.5.0-pre";
 
   src = lib.cleanSourceWith {
     filter = name: type: !(type == "directory" && builtins.elem (baseNameOf name) [ "target" "manual" "integration-tests" ]);