diff --git a/pallets/audit/src/lib.rs b/pallets/audit/src/lib.rs
index f53d5dd7..de59b508 100644
--- a/pallets/audit/src/lib.rs
+++ b/pallets/audit/src/lib.rs
@@ -1019,7 +1019,7 @@ pub mod pallet {
 				return weight;
 			}
 
-			if now % 10u32.saturated_into() != 0u32.saturated_into() {
+			if now % 4u32.saturated_into() != 0u32.saturated_into() {
 				return weight;
 			}
 
@@ -1040,6 +1040,7 @@ pub mod pallet {
 			};
 			let index = factor % miner_count;
 			let miner = &miner_list[index as usize];
+			log::info!("generate challenge index: {:?}", index);
 
 			if <ChallengeSnapShot<T>>::contains_key(miner) {
 				log::info!("audit: Select invalid miner");
diff --git a/standalone/chain/runtime/src/lib.rs b/standalone/chain/runtime/src/lib.rs
index 93342ed7..02f4ea69 100644
--- a/standalone/chain/runtime/src/lib.rs
+++ b/standalone/chain/runtime/src/lib.rs
@@ -146,7 +146,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	// and set impl_version to 0. If only runtime
 	// implementation changes and behavior does not, then leave spec_version as
 	// is and increment impl_version.
-	spec_version: 117,
+	spec_version: 118,
 	impl_version: 0,
 	apis: RUNTIME_API_VERSIONS,
 	transaction_version: 1,