diff --git a/README.md b/README.md
index 32f9b02..9d23d53 100644
--- a/README.md
+++ b/README.md
@@ -35,13 +35,13 @@ To generate a C++ header file as part of the build, instead run:
 cargo build --release --package loot-condition-interpreter-ffi --all-features
 ```
 
-This will create a file at `ffi/include/loot_condition_interpreter.hpp`.
+This will create a file at `ffi/include/loot_condition_interpreter.h`.
 However, this involves building [cbindgen](https://github.com/eqrion/cbindgen)
 as a dependency, which is relatively slow. If you have cbindgen installed
 separately, it's faster to generate the headers using its CLI:
 
 ```
-cbindgen ffi/ -l c++ -o ffi/include/loot_condition_interpreter.hpp
+cbindgen ffi/ -o ffi/include/loot_condition_interpreter.h
 ```
 
 ## Tests & Benchmarks
diff --git a/ffi/Cargo.toml b/ffi/Cargo.toml
index f39c25f..5cb6087 100644
--- a/ffi/Cargo.toml
+++ b/ffi/Cargo.toml
@@ -19,4 +19,4 @@ default = []
 ffi-headers = ["cbindgen"]
 
 [build-dependencies]
-cbindgen = { version = "0.6", optional = true }
+cbindgen = { version = "0.9", optional = true }
diff --git a/ffi/build.rs b/ffi/build.rs
index 0315e0b..74affc4 100644
--- a/ffi/build.rs
+++ b/ffi/build.rs
@@ -5,8 +5,7 @@ mod ffi_headers {
     use std::env;
     use std::fs;
 
-    use self::cbindgen::Builder;
-    use self::cbindgen::Language;
+    use self::cbindgen::generate;
 
     pub fn generate_headers() {
         let crate_dir = env::var("CARGO_MANIFEST_DIR")
@@ -14,13 +13,9 @@ mod ffi_headers {
 
         fs::create_dir_all("include").expect("could not create include directory");
 
-        Builder::new()
-            .with_crate(&crate_dir)
-            .with_language(Language::Cxx)
-            .with_std_types(false)
-            .generate()
-            .expect("could not generate C++ header file")
-            .write_to_file("include/loot_condition_interpreter.hpp");
+        generate(&crate_dir)
+            .expect("could not generate C/C++ header file")
+            .write_to_file("include/loot_condition_interpreter.h");
     }
 }
 
diff --git a/ffi/cbindgen.toml b/ffi/cbindgen.toml
new file mode 100644
index 0000000..f0407f7
--- /dev/null
+++ b/ffi/cbindgen.toml
@@ -0,0 +1,2 @@
+language = "C"
+cpp_compat = true
diff --git a/ffi/tests/ffi.cpp b/ffi/tests/ffi.cpp
index c84fd70..d2b24a0 100644
--- a/ffi/tests/ffi.cpp
+++ b/ffi/tests/ffi.cpp
@@ -8,7 +8,7 @@
 #include <thread>
 #include <vector>
 
-#include "loot_condition_interpreter.hpp"
+#include "loot_condition_interpreter.h"
 
 void test_game_id_values() {
   printf("testing LCI_GAME_* values...\n");