diff --git a/lib/Cargo.toml b/lib/Cargo.toml
index 384fe769..e4a67252 100644
--- a/lib/Cargo.toml
+++ b/lib/Cargo.toml
@@ -23,7 +23,7 @@ log = "0.3"
 url = "1"
 toml = "0.4.2"
 num_cpus = "1"
-state = "0.3.3"
+state = "0.4"
 time = "0.1"
 memchr = "1"
 base64 = "0.6"