diff --git a/storage-proofs-porep/Cargo.toml b/storage-proofs-porep/Cargo.toml
index 849f534aa6..8c78d80f23 100644
--- a/storage-proofs-porep/Cargo.toml
+++ b/storage-proofs-porep/Cargo.toml
@@ -15,7 +15,6 @@ storage-proofs-core = { path = "../storage-proofs-core", version = "^6.0.0", def
 sha2raw = { path = "../sha2raw", version = "^2.0.0"}
 filecoin-hashers = { path = "../filecoin-hashers", version = "1.0.0", default-features = false, features = ["poseidon", "sha256"]}
 rand = "0.7"
-memmap = "0.7"
 merkletree = "0.21.0"
 mapr = "0.8.0"
 num-bigint = "0.2"