diff --git a/Cargo.toml b/Cargo.toml
index e66f999..c494c07 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,13 +11,13 @@ An implementation of the GNU make jobserver for Rust
 """
 
 [dependencies]
-log = "0.4"
+log = "0.4.6"
 
 [target.'cfg(unix)'.dependencies]
-libc = "0.2"
+libc = "0.2.50"
 
 [target.'cfg(windows)'.dependencies]
-rand = "0.6"
+rand = "0.6.5"
 
 [dev-dependencies]
 futures = "0.1"