diff --git a/beacon_chain/nimbus_binary_common.nim b/beacon_chain/nimbus_binary_common.nim
index 2ecda64e7..27086fa1a 100644
--- a/beacon_chain/nimbus_binary_common.nim
+++ b/beacon_chain/nimbus_binary_common.nim
@@ -11,7 +11,7 @@
 
 import
   # Standard library
-  std/[os, tables, strutils, terminal, typetraits],
+  std/[tables, strutils, terminal, typetraits],
 
   # Nimble packages
   chronos, confutils, toml_serialization,
@@ -96,6 +96,9 @@ proc detectTTY*(stdoutKind: StdoutLogKind): StdoutLogKind =
   else:
     stdoutKind
 
+when defaultChroniclesStream.outputs.type.arity == 2:
+  from std/os import splitFile
+
 proc setupLogging*(
     logLevel: string, stdoutKind: StdoutLogKind, logFile: Option[OutFile]) =
   # In the cfg file for nimbus, we create two formats: textlines and json.
diff --git a/beacon_chain/rpc/rest_beacon_api.nim b/beacon_chain/rpc/rest_beacon_api.nim
index 6194c2ebf..c2e2ef2fa 100644
--- a/beacon_chain/rpc/rest_beacon_api.nim
+++ b/beacon_chain/rpc/rest_beacon_api.nim
@@ -6,7 +6,7 @@
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
 import
-  std/[typetraits, sequtils, strutils, sets],
+  std/[typetraits, sequtils, sets],
   stew/[results, base10],
   chronicles,
   ./rest_utils,
diff --git a/beacon_chain/rpc/rest_validator_api.nim b/beacon_chain/rpc/rest_validator_api.nim
index d39910d3c..6d302546d 100644
--- a/beacon_chain/rpc/rest_validator_api.nim
+++ b/beacon_chain/rpc/rest_validator_api.nim
@@ -1,9 +1,10 @@
-# Copyright (c) 2018-2021 Status Research & Development GmbH
+# Copyright (c) 2018-2022 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
-import std/[typetraits, strutils, sets]
+
+import std/[typetraits, sets]
 import stew/[results, base10], chronicles
 import ".."/[beacon_chain_db, beacon_node],
        ".."/networking/eth2_network,
diff --git a/beacon_chain/spec/eth2_apis/rest_keymanager_types.nim b/beacon_chain/spec/eth2_apis/rest_keymanager_types.nim
index 55d97a480..23bfa8853 100644
--- a/beacon_chain/spec/eth2_apis/rest_keymanager_types.nim
+++ b/beacon_chain/spec/eth2_apis/rest_keymanager_types.nim
@@ -1,5 +1,11 @@
+# beacon_chain
+# Copyright (c) 2021-2022 Status Research & Development GmbH
+# Licensed and distributed under either of
+#   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
+#   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
+# at your option. This file may not be copied, modified, or distributed except according to those terms.
+
 import
-  std/[tables, strutils, uri],
   ".."/[crypto, keystore],
   ../../validators/slashing_protection_common
 
diff --git a/beacon_chain/spec/eth2_apis/rest_types.nim b/beacon_chain/spec/eth2_apis/rest_types.nim
index 3239b99b5..a18af6b0a 100644
--- a/beacon_chain/spec/eth2_apis/rest_types.nim
+++ b/beacon_chain/spec/eth2_apis/rest_types.nim
@@ -14,7 +14,7 @@
 {.push raises: [Defect].}
 
 import
-  std/[json, typetraits],
+  std/json,
   stew/base10, web3/ethtypes,
   ".."/forks,
   ".."/datatypes/[phase0, altair, bellatrix],
diff --git a/beacon_chain/validator_client/attestation_service.nim b/beacon_chain/validator_client/attestation_service.nim
index cbe433454..638ff77af 100644
--- a/beacon_chain/validator_client/attestation_service.nim
+++ b/beacon_chain/validator_client/attestation_service.nim
@@ -1,4 +1,11 @@
-import std/[sets, sequtils]
+# beacon_chain
+# Copyright (c) 2021-2022 Status Research & Development GmbH
+# Licensed and distributed under either of
+#   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
+#   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
+# at your option. This file may not be copied, modified, or distributed except according to those terms.
+
+import std/sets
 import chronicles
 import "."/[common, api, block_service]
 
diff --git a/beacon_chain/validator_client/common.nim b/beacon_chain/validator_client/common.nim
index b452902b4..8115f543a 100644
--- a/beacon_chain/validator_client/common.nim
+++ b/beacon_chain/validator_client/common.nim
@@ -1,4 +1,11 @@
-import std/[tables, os, sets, sequtils, strutils]
+# beacon_chain
+# Copyright (c) 2021-2022 Status Research & Development GmbH
+# Licensed and distributed under either of
+#   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
+#   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
+# at your option. This file may not be copied, modified, or distributed except according to those terms.
+
+import std/[tables, os, sets, sequtils]
 import chronos, presto, presto/client as presto_client, chronicles, confutils,
        json_serialization/std/[options, net],
        stew/[base10, results, byteutils]
diff --git a/beacon_chain/validator_client/sync_committee_service.nim b/beacon_chain/validator_client/sync_committee_service.nim
index a716da00a..dc38e9acc 100644
--- a/beacon_chain/validator_client/sync_committee_service.nim
+++ b/beacon_chain/validator_client/sync_committee_service.nim
@@ -1,5 +1,12 @@
+# beacon_chain
+# Copyright (c) 2022 Status Research & Development GmbH
+# Licensed and distributed under either of
+#   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
+#   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
+# at your option. This file may not be copied, modified, or distributed except according to those terms.
+
 import
-  std/[sets, sequtils],
+  std/sets,
   chronicles,
   "."/[common, api, block_service],
   ../spec/datatypes/[phase0, altair, bellatrix],
diff --git a/beacon_chain/validators/validator_duties.nim b/beacon_chain/validators/validator_duties.nim
index 570dbb578..aba2cb687 100644
--- a/beacon_chain/validators/validator_duties.nim
+++ b/beacon_chain/validators/validator_duties.nim
@@ -13,7 +13,7 @@
 
 import
   # Standard library
-  std/[os, osproc, sequtils, streams, tables],
+  std/[os, sequtils, tables],
 
   # Nimble packages
   stew/[assign2, byteutils, objects],