diff --git a/acme_common/Cargo.toml b/acme_common/Cargo.toml
index 9035b1f..cd095f8 100644
--- a/acme_common/Cargo.toml
+++ b/acme_common/Cargo.toml
@@ -28,4 +28,4 @@ syslog = "5.0"
 toml = "0.5"
 
 [target.'cfg(unix)'.dependencies]
-nix = "0.17"
+nix = "0.18"