diff --git a/Cargo.lock b/Cargo.lock
index 4eb64d4..22dbc32 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -76,9 +76,9 @@ dependencies = [
 
 [[package]]
 name = "libc"
-version = "0.2.105"
+version = "0.2.139"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "869d572136620d55835903746bcb5cdc54cb2851fd0aeec53220b4bb65ef3013"
+checksum = "201de327520df007757c1f0adce6e827fe8562fbc28bfd9c15571c66ca1f5f79"
 
 [[package]]
 name = "memchr"