diff --git a/Cargo.lock b/Cargo.lock
index 80579a17..a048869e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -422,9 +422,9 @@ checksum = "830d08ce1d1d941e6b30645f1a0eb5643013d835ce3779a5fc208261dbe10f55"
 
 [[package]]
 name = "libc"
-version = "0.2.147"
+version = "0.2.151"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
+checksum = "302d7ab3130588088d277783b1e2d2e10c9e9e4a16dd9050e6ec93fb3e7048f4"
 
 [[package]]
 name = "libloading"
diff --git a/tstdc/Cargo.toml b/tstdc/Cargo.toml
index 0d5d8bd6..123ede48 100644
--- a/tstdc/Cargo.toml
+++ b/tstdc/Cargo.toml
@@ -18,6 +18,6 @@ doctest = false
 
 [dependencies]
 displaydoc = { version = "0.2.3", default-features = false }
-libc = { version = "0.2.139", default-features = false }
+libc = { version = "0.2.151", default-features = false }
 mc-sgx-tstdc-sys = { path = "sys", version = "=0.10.0" }
 mc-sgx-tstdc-sys-types = { path = "sys/types", version = "=0.10.0" }