diff --git a/acme_common/Cargo.toml b/acme_common/Cargo.toml
index 1cd1464..40398c9 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 = "0.19", default-features = false }
+attohttpc = { version = "0.20", default-features = false }
 base64 = "0.13"
 daemonize = "0.4"
 env_logger = "0.9"
diff --git a/acmed/Cargo.toml b/acmed/Cargo.toml
index 6c6f171..f54d9c7 100644
--- a/acmed/Cargo.toml
+++ b/acmed/Cargo.toml
@@ -17,11 +17,11 @@ publish = false
 default = ["openssl_dyn"]
 crypto_openssl = []
 openssl_dyn = ["crypto_openssl", "acme_common/openssl_dyn", "attohttpc/tls"]
-openssl_vendored = ["crypto_openssl", "acme_common/openssl_vendored", "attohttpc/tls"]
+openssl_vendored = ["crypto_openssl", "acme_common/openssl_vendored", "attohttpc/tls", "attohttpc/tls-vendored"]
 
 [dependencies]
 acme_common = { path = "../acme_common" }
-attohttpc = { version = "0.19", default-features = false, features = ["charsets", "json"] }
+attohttpc = { version = "0.20", default-features = false, features = ["charsets", "json"] }
 bincode = "1.3"
 clap = "3.0"
 glob = "0.3"