diff --git a/chain-signatures/contract/src/lib.rs b/chain-signatures/contract/src/lib.rs
index 36b730d13..01b56db4d 100644
--- a/chain-signatures/contract/src/lib.rs
+++ b/chain-signatures/contract/src/lib.rs
@@ -7,7 +7,9 @@ use crypto_shared::{
 use near_sdk::borsh::{self, BorshDeserialize, BorshSerialize};
 use near_sdk::collections::LookupMap;
 use near_sdk::serde::{Deserialize, Serialize};
-use near_sdk::{env, near_bindgen, AccountId, NearToken, Promise, PromiseOrValue, PublicKey};
+use near_sdk::{
+    env, near_bindgen, AccountId, BorshStorageKey, NearToken, Promise, PromiseOrValue, PublicKey,
+};
 use near_sdk::{log, Gas};
 use primitives::{
     CandidateInfo, Candidates, ParticipantInfo, Participants, PkVotes, SignRequest, Votes,
diff --git a/flake.nix b/flake.nix
index 885f39aec..95185b8c6 100644
--- a/flake.nix
+++ b/flake.nix
@@ -54,6 +54,7 @@
               cargo-watch
               cargo-audit
               sccache
+              gmp
 
               # TODO Add podman + docker image dependencies
               # TODO Add AWS-CLI and dummy credentials
diff --git a/integration-tests/chain-signatures/tests/actions/mod.rs b/integration-tests/chain-signatures/tests/actions/mod.rs
index 37e7f1168..e7fc4f68d 100644
--- a/integration-tests/chain-signatures/tests/actions/mod.rs
+++ b/integration-tests/chain-signatures/tests/actions/mod.rs
@@ -73,7 +73,7 @@ pub async fn request_sign(
                     }))?,
                     gas: 300_000_000_000_000,
                     deposit: 1,
-                })],
+                }))],
             }
             .sign(&signer),
         })
@@ -242,7 +242,7 @@ pub async fn request_sign_non_random(
                     }))?,
                     gas: 300_000_000_000_000,
                     deposit: 1,
-                })],
+                }))],
             }
             .sign(&signer),
         })