diff --git a/Cargo.lock b/Cargo.lock
index 467b430..2f07a0a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -460,7 +460,7 @@ checksum = "bec47e5bfd1bff0eeaf6d8b485cc1074891a197ab4225d504cb7a1ab88b02bf0"
 
 [[package]]
 name = "zeroize"
-version = "0.4.20"
+version = "0.4.21"
 dependencies = [
  "libc",
  "memsec",