diff --git a/mcaptcha-pow-ffi/Cargo.lock b/mcaptcha-pow-ffi/Cargo.lock
index d5d0de3..9d82c4a 100644
--- a/mcaptcha-pow-ffi/Cargo.lock
+++ b/mcaptcha-pow-ffi/Cargo.lock
@@ -151,9 +151,9 @@ checksum = "b9e0384b61958566e926dc50660321d12159025e767c18e043daf26b70104c39"
 
 [[package]]
 name = "libc"
-version = "0.2.155"
+version = "0.2.158"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97b3888a4aecf77e811145cadf6eef5901f4782c53886191b2f693f24761847c"
+checksum = "d8adc4bb1803a324070e64a98ae98f38934d91957a99cfb3a43dcbc01bc56439"
 
 [[package]]
 name = "mcaptcha-pow-ffi"