diff --git a/acme_common/Cargo.toml b/acme_common/Cargo.toml
index 3553e3b..f1eb772 100644
--- a/acme_common/Cargo.toml
+++ b/acme_common/Cargo.toml
@@ -19,7 +19,7 @@ openssl_dyn = ["crypto_openssl", "openssl", "openssl-sys"]
 openssl_vendored = ["crypto_openssl", "openssl/vendored", "openssl-sys/vendored"]
 
 [dependencies]
-attohttpc = { version = "0.17", default-features = false }
+attohttpc = { version = "0.18", default-features = false }
 base64 = "0.13"
 daemonize = "0.4"
 env_logger = "0.9"
@@ -36,4 +36,4 @@ tinytemplate = "1.2"
 toml = "0.5"
 
 [target.'cfg(unix)'.dependencies]
-nix = "0.22"
+nix = "0.23"
diff --git a/acmed/Cargo.toml b/acmed/Cargo.toml
index a190711..289a395 100644
--- a/acmed/Cargo.toml
+++ b/acmed/Cargo.toml
@@ -21,7 +21,7 @@ openssl_vendored = ["crypto_openssl", "acme_common/openssl_vendored", "attohttpc
 
 [dependencies]
 acme_common = { path = "../acme_common" }
-attohttpc = { version = "0.17", default-features = false, features = ["charsets", "json"] }
+attohttpc = { version = "0.18", default-features = false, features = ["charsets", "json"] }
 bincode = "1.3"
 clap = "2.32"
 glob = "0.3"
@@ -33,7 +33,7 @@ tinytemplate = "1.2"
 toml = "0.5"
 
 [target.'cfg(unix)'.dependencies]
-nix = "0.22"
+nix = "0.23"
 
 [build-dependencies]
 serde = { version = "1.0", features = ["derive"] }