diff --git a/Cargo.toml b/Cargo.toml
index 54eca8b..5020f12 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "evalexpr"
-version = "6.4.0"
+version = "6.4.1-alpha.0"
 description = "A powerful arithmetic and boolean expression evaluator"
 keywords = ["expression", "evaluate", "evaluator", "arithmetic", "boolean"]
 categories = ["parsing", "game-engines"]