diff --git a/lib/Cargo.toml b/lib/Cargo.toml
index 34f70bcb..9bc3ef62 100644
--- a/lib/Cargo.toml
+++ b/lib/Cargo.toml
@@ -40,7 +40,7 @@ hex = "0.4"
 nom = "6"
 peg = "0.6"
 siphasher = "0.3"
-lasso = {version="0.4", features=["multi-threaded", "inline-more"]}
+lasso = {version="0.5", features=["multi-threaded", "inline-more"]}
 sophia_api = { version = "0.6.2", optional = true }
 http = "0.2"
 httparse = { version = "1", optional = true }