diff --git a/Cargo.lock b/Cargo.lock
index aeff21b9d..fe07d7ff7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -689,9 +689,9 @@ dependencies = [
 
 [[package]]
 name = "pkg-config"
-version = "0.3.20"
+version = "0.3.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7c9b1041b4387893b91ee6746cddfc28516aff326a3519fb2adf820932c5e6cb"
+checksum = "10e2fcbb64ecbe64c8e040a386c3104d384583af58b956d870aaaf229df6e66d"
 
 [[package]]
 name = "pnet"