diff --git a/Cargo.lock b/Cargo.lock
index 21db3bc227d..064537870f1 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -985,8 +985,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "fontsan"
-version = "0.3.2"
-source = "git+https://github.com/servo/fontsan#ab68da1723827d6302653ccb76c1d215d36b7d4c"
+version = "0.4.0"
+source = "git+https://github.com/servo/fontsan#29e879c870348c4b3fd51086e42dbb6365171479"
 dependencies = [
  "cmake 0.1.22 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1099,7 +1099,7 @@ dependencies = [
  "dwrote 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.15.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "fontsan 0.3.2 (git+https://github.com/servo/fontsan)",
+ "fontsan 0.4.0 (git+https://github.com/servo/fontsan)",
  "freetype 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "gfx_traits 0.0.1",
  "harfbuzz-sys 0.1.15 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3872,7 +3872,7 @@ dependencies = [
 "checksum extra-default 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ca1434e1920ba21b45516c16b5edbd82e8f2e4349b12a7a53eb9903ed2928d56"
 "checksum flate2 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)" = "36df0166e856739905cd3d7e0b210fe818592211a008862599845e012d8d304c"
 "checksum fnv 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)" = "6cc484842f1e2884faf56f529f960cc12ad8c71ce96cc7abba0a067c98fee344"
-"checksum fontsan 0.3.2 (git+https://github.com/servo/fontsan)" = "<none>"
+"checksum fontsan 0.4.0 (git+https://github.com/servo/fontsan)" = "<none>"
 "checksum foreign-types 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3e4056b9bd47f8ac5ba12be771f77a0dae796d1bbaaf5fd0b9c2d38b69b8a29d"
 "checksum freetype 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "398b8a11884898184d55aca9806f002b3cf68f0e860e0cbb4586f834ee39b0e7"
 "checksum futf 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "51f93f3de6ba1794dcd5810b3546d004600a59a98266487c8407bc4b24e398f3"