diff --git a/substrate/Cargo.lock b/substrate/Cargo.lock
index 873da8abac..2fe01c905d 100644
--- a/substrate/Cargo.lock
+++ b/substrate/Cargo.lock
@@ -3658,9 +3658,9 @@ checksum = "3576a87f2ba00f6f106fdfcd16db1d698d648a26ad8e0573cad8537c3c362d2a"
 
 [[package]]
 name = "libc"
-version = "0.2.119"
+version = "0.2.121"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1bf2e165bb3457c8e098ea76f3e3bc9db55f87aa90d52d0e6be741470916aaa4"
+checksum = "efaa7b300f3b5fe8eb6bf21ce3895e1751d9665086af2d64b42f19701015ff4f"
 
 [[package]]
 name = "libgit2-sys"
diff --git a/substrate/client/executor/wasmtime/Cargo.toml b/substrate/client/executor/wasmtime/Cargo.toml
index 13bf196c4d..f0155204f5 100644
--- a/substrate/client/executor/wasmtime/Cargo.toml
+++ b/substrate/client/executor/wasmtime/Cargo.toml
@@ -13,7 +13,7 @@ readme = "README.md"
 targets = ["x86_64-unknown-linux-gnu"]
 
 [dependencies]
-libc = "0.2.119"
+libc = "0.2.121"
 cfg-if = "1.0"
 log = "0.4.8"
 parity-wasm = "0.42.0"
diff --git a/substrate/client/tracing/Cargo.toml b/substrate/client/tracing/Cargo.toml
index 3c4401e2d3..76cdcb4e4b 100644
--- a/substrate/client/tracing/Cargo.toml
+++ b/substrate/client/tracing/Cargo.toml
@@ -17,7 +17,7 @@ ansi_term = "0.12.1"
 atty = "0.2.13"
 chrono = "0.4.19"
 lazy_static = "1.4.0"
-libc = "0.2.119"
+libc = "0.2.121"
 log = { version = "0.4.8" }
 once_cell = "1.8.0"
 parking_lot = "0.12.0"