diff --git a/em-app/Cargo.toml b/em-app/Cargo.toml
index aee6d126..05fe843d 100644
--- a/em-app/Cargo.toml
+++ b/em-app/Cargo.toml
@@ -15,7 +15,7 @@ em-client = { version = "3.0.0", default-features = false, features = ["client"]
 em-node-agent-client = "1.0.0"
 hyper = { version = "0.10", default-features = false }
 mbedtls = { version = "0.9", features = [ "rdrand", "std", "force_aesni_support", "mpi_force_c_code" ], default-features = false }
-pkix = "0.1.2"
+pkix = ">=0.1.2, <0.3.0"
 
 rustc-serialize = "0.3.24"
 sdkms = { version = "0.2.1", default-features = false }