diff --git a/dns_utility/Cargo.lock b/dns_utility/Cargo.lock
index 33fbc9193..7b9e866a7 100644
--- a/dns_utility/Cargo.lock
+++ b/dns_utility/Cargo.lock
@@ -1,5 +1,7 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
+
 [[package]]
 name = "actix"
 version = "0.7.9"
@@ -638,9 +640,9 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
 [[package]]
 name = "libc"
-version = "0.2.86"
+version = "0.2.135"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b7282d924be3275cec7f6756ff4121987bc6481325397dde6ba3e7802b1a8b1c"
+checksum = "68783febc7782c6c5cb401fbda4de5a9898be1762314da0bb2c10ced61f18b0c"
 
 [[package]]
 name = "libsecp256k1"
diff --git a/dns_utility/Cargo.toml b/dns_utility/Cargo.toml
index f825efa76..1f9236a45 100644
--- a/dns_utility/Cargo.toml
+++ b/dns_utility/Cargo.toml
@@ -9,7 +9,7 @@ edition = "2018"
 
 [dependencies]
 regex = "1.4.3"
-libc = "0.2.86"
+libc = "0.2.135"
 masq_lib = { path = "../masq_lib" }
 ipconfig = "0.2.2"