diff --git a/Cargo.toml b/Cargo.toml
index c6dfd7a..d0e58b3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,7 +10,7 @@ crate-type = ["staticlib", "cdylib"]
 [dependencies]
 env_logger = "0.7"
 gdnative = "0.9.0-preview.0"
-tts = "0.6"
+tts = ">= 0.6.4"
 
 [target.'cfg(windows)'.dependencies]
-tolk = "0.2"
+tolk = ">= 0.2.1"