diff --git a/Cargo.toml b/Cargo.toml
index 9892998..33fed53 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,4 +16,4 @@ links = "libudev"
 libc = "0.2"
 
 [build-dependencies]
-pkg-config = "0.3.2"
+pkg-config = "0.3.22"
diff --git a/ci/1.4.0/Cargo.lock b/ci/1.4.0/Cargo.lock
index f922b9d..3cd408c 100644
--- a/ci/1.4.0/Cargo.lock
+++ b/ci/1.4.0/Cargo.lock
@@ -1,18 +1,23 @@
-[root]
-name = "libudev-sys"
-version = "0.1.4"
-dependencies = [
- "libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)",
- "pkg-config 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
-]
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
 
 [[package]]
 name = "libc"
-version = "0.2.40"
+version = "0.2.108"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8521a1b57e76b1ec69af7599e75e38e7b7fad6610f037db8c79b127201b5d119"
+
+[[package]]
+name = "libudev-sys"
+version = "0.1.4"
+dependencies = [
+ "libc",
+ "pkg-config",
+]
 
 [[package]]
 name = "pkg-config"
-version = "0.3.9"
+version = "0.3.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-
+checksum = "12295df4f294471248581bc09bef3c38a5e46f1e36d6a37353621a0c6c357e1f"