diff --git a/Cargo.toml b/Cargo.toml
index 8a86728..2496239 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,9 +19,9 @@ maintenance = { status = "actively-developed" }
 
 [dependencies]
 serde_json = "1.0"
-serde = "*"
-serde_derive = "*"
-itertools = "0.6.0"
+serde = "1.0"
+serde_derive = "1.0"
+itertools = "0.6"
 docopt = "0.8"
 image = "0.15"
 rand = "0.3"