diff --git a/mcaptcha-pow-ffi/Cargo.lock b/mcaptcha-pow-ffi/Cargo.lock
index cfea0a8..d5d0de3 100644
--- a/mcaptcha-pow-ffi/Cargo.lock
+++ b/mcaptcha-pow-ffi/Cargo.lock
@@ -151,9 +151,9 @@ checksum = "b9e0384b61958566e926dc50660321d12159025e767c18e043daf26b70104c39"
 
 [[package]]
 name = "libc"
-version = "0.2.151"
+version = "0.2.155"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "302d7ab3130588088d277783b1e2d2e10c9e9e4a16dd9050e6ec93fb3e7048f4"
+checksum = "97b3888a4aecf77e811145cadf6eef5901f4782c53886191b2f693f24761847c"
 
 [[package]]
 name = "mcaptcha-pow-ffi"