diff --git a/Cargo.toml b/Cargo.toml
index 071c845af..78d0b0889 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -61,12 +61,12 @@ ring = "0.12.1"
 untrusted = "0.5.1"
 bincode = "1.0.0"
 chrono = { version = "0.4.0", features = ["serde"] }
-log = "^0.4.1"
-env_logger = "^0.4.1"
-matches = "^0.1.6"
-byteorder = "^1.2.1"
-libc = "^0.2.1"
-getopts = "^0.2"
+log = "0.4.1"
+env_logger = "0.4.1"
+matches = "0.1.6"
+byteorder = "1.2.1"
+libc = "0.2.1"
+getopts = "0.2"
 isatty = "0.1"
 rand = "0.5.1"
-pnet = "^0.21.0"
+pnet = "0.21.0"