diff --git a/Cargo.lock b/Cargo.lock
index 7442975b145..b45c98d71b1 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -643,12 +643,13 @@ dependencies = [
 
 [[package]]
 name = "cbindgen"
-version = "0.14.6"
+version = "0.20.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "afa64e93023395ee316490cf013f07f753bc88d116eb1aec1bcee7d63fbcca53"
+checksum = "51e3973b165dc0f435831a9e426de67e894de532754ff7a3f307c03ee5dec7dc"
 dependencies = [
  "clap",
  "heck",
+ "indexmap",
  "log",
  "proc-macro2",
  "quote",
diff --git a/ports/libsimpleservo/capi/Cargo.toml b/ports/libsimpleservo/capi/Cargo.toml
index a856d5f5b4e..1fa160a548f 100644
--- a/ports/libsimpleservo/capi/Cargo.toml
+++ b/ports/libsimpleservo/capi/Cargo.toml
@@ -26,7 +26,7 @@ libc = "0.2"
 winapi = { version = "0.3", features = ["wingdi", "winuser", "winnt", "winbase", "processenv", "namedpipeapi", "ntdef", "minwindef", "handleapi", "debugapi"] }
 
 [build-dependencies]
-cbindgen = "0.14"
+cbindgen = "0.20"
 
 [features]
 debugmozjs = ["simpleservo/debugmozjs"]