diff --git a/Cargo.toml b/Cargo.toml
index 8991d29..8760f08 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -17,7 +17,7 @@ log = "*"
 rand = "*"
 sha1 = "*"
 url = "*"
-utf-8 = "*"
+utf-8 = "0.6"
 
 [dependencies.native-tls]
 optional = true