diff --git a/Cargo.toml b/Cargo.toml
index 5a9e406..27b9a01 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "acquire-imaging"
 authors = ["Nathan Clack <nclack@chanzuckerberg.com>"]
-version = "0.3.1"
+version = "0.4.0-rc1"
 edition = "2021"
 
 [lib]