diff --git a/test/src/specs/hardfork/v2021/cell_deps.rs b/test/src/specs/hardfork/v2021/cell_deps.rs
index 5ce889bd86..929a2e2f54 100644
--- a/test/src/specs/hardfork/v2021/cell_deps.rs
+++ b/test/src/specs/hardfork/v2021/cell_deps.rs
@@ -152,6 +152,7 @@ impl Spec for CheckCellDeps {
     fn modify_chain_spec(&self, spec: &mut ckb_chain_spec::ChainSpec) {
         spec.params.permanent_difficulty_in_dummy = Some(true);
         spec.params.genesis_epoch_length = Some(GENESIS_EPOCH_LENGTH);
+        spec.params.epoch_duration_target = Some(GENESIS_EPOCH_LENGTH * 8);
     }
 }