diff --git a/nsm-lib/Cargo.toml b/nsm-lib/Cargo.toml
index 724eb53..acdec9b 100644
--- a/nsm-lib/Cargo.toml
+++ b/nsm-lib/Cargo.toml
@@ -10,7 +10,7 @@ aws-nitro-enclaves-nsm-api = { path = "../" }
 serde_bytes = "0.11"
 
 [build-dependencies]
-cbindgen = { version = "0.15", default-features = false }
+cbindgen = { version = "0.21", default-features = false }
 
 [lib]
 name = "nsm"