diff --git a/Cargo.toml b/Cargo.toml
index 376a225..4ad3062 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -17,7 +17,7 @@ fips = ["boring/fips", "boring-sys/fips"]
 
 [dependencies]
 boring = "3.0.2"
-boring-sys = "3.0.2"
+boring-sys = "4.0.0"
 bytes = "1"
 foreign-types-shared = "0.3.1"
 lru = "0.11.0"