diff --git a/hardhat.config.ts b/hardhat.config.ts
index 68530fe..779b42d 100644
--- a/hardhat.config.ts
+++ b/hardhat.config.ts
@@ -83,7 +83,7 @@ const config: HardhatUserConfig = {
     },
   },
   zksolc: {
-    version: "1.3.19",
+    version: "1.3.21",
     compilerSource: "binary",
     settings: {
       isSystem: false,