diff --git a/beacon_chain/beacon_node.nim b/beacon_chain/beacon_node.nim
index 055d0bad58..fe9370f4dd 100644
--- a/beacon_chain/beacon_node.nim
+++ b/beacon_chain/beacon_node.nim
@@ -1,7 +1,8 @@
 import
   net, sequtils, options, tables, osproc, random, strutils, times, strformat,
   stew/shims/os, stew/[objects, bitseqs],
-  chronos, chronicles, confutils, serialization/errors,
+  chronos, chronicles, confutils,
+  json_serialization/std/sets, serialization/errors,
   eth/trie/db, eth/trie/backends/rocksdb_backend, eth/async_utils,
   spec/[datatypes, digest, crypto, beaconstate, helpers, validator,
   state_transition_block],
diff --git a/beacon_chain/spec/beaconstate.nim b/beacon_chain/spec/beaconstate.nim
index bf050661a1..dec1ecb8b4 100644
--- a/beacon_chain/spec/beaconstate.nim
+++ b/beacon_chain/spec/beaconstate.nim
@@ -6,8 +6,8 @@
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
 import
-  tables, algorithm, sets, math, options, sequtils,
-  chronicles, stew/bitseqs,
+  tables, algorithm, math, options, sequtils,
+  json_serialization/std/sets, chronicles, stew/bitseqs,
   ../extras, ../ssz, ../beacon_node_types,
   ./crypto, ./datatypes, ./digest, ./helpers, ./validator