diff --git a/servo/Cargo.lock b/servo/Cargo.lock
index 31097881c20f..d71b72b14fef 100644
--- a/servo/Cargo.lock
+++ b/servo/Cargo.lock
@@ -156,7 +156,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cexpr 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "clang-sys 0.21.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "clang-sys 0.21.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "clap 2.27.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 0.2.9 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -362,7 +362,7 @@ dependencies = [
 
 [[package]]
 name = "clang-sys"
-version = "0.21.0"
+version = "0.21.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3885,7 +3885,7 @@ dependencies = [
 "checksum cexpr 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "393a5f0088efbe41f9d1fcd062f24e83c278608420e62109feb2c8abee07de7d"
 "checksum cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "d4c819a1287eb618df47cc647173c5c4c66ba19d888a6e50d605672aed3140de"
 "checksum cgl 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "86765cb42c2a2c497e142af72517c1b4d7ae5bb2f25dfa77a5c69642f2342d89"
-"checksum clang-sys 0.21.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5955eab05fa8e6ff2b353753dc73a0608daa36e472a21c69f2eb51f43f593544"
+"checksum clang-sys 0.21.1 (registry+https://github.com/rust-lang/crates.io-index)" = "00048189ee171715296dfe3b2fcfd439563c7bfec0d98d3976ce3402d62c8f07"
 "checksum clap 2.27.1 (registry+https://github.com/rust-lang/crates.io-index)" = "1b8c532887f1a292d17de05ae858a8fe50a301e196f9ef0ddb7ccd0d1d00f180"
 "checksum clipboard 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "dd3a9a938558f33ec1baaa6ca631a69c104aafaacbc66868d9ad28cf5f30564f"
 "checksum clipboard-win 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "693b1280c514045382dfdbb78d1594b1b03cdb66320aeb7ebd2bd38d49bae959"