diff --git a/Cargo.lock b/Cargo.lock
index da4ad58e..d3e68810 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -148,7 +148,7 @@ dependencies = [
 
 [[package]]
 name = "cargo-mutants"
-version = "23.6.0"
+version = "23.9.0-pre"
 dependencies = [
  "anyhow",
  "assert_cmd",
diff --git a/Cargo.toml b/Cargo.toml
index 1759ca47..1e23edc1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "cargo-mutants"
-version = "23.6.0"
+version = "23.9.0-pre"
 edition = "2021"
 authors = ["Martin Pool"]
 license = "MIT"