diff --git a/Cargo.lock b/Cargo.lock
index 3f0dd23fb..bb5cf7b2e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -114,9 +114,9 @@ checksum = "53d1ccbaf7d9ec9537465a97bf19edc1a4e158ecb49fc16178202238c569cc42"
 
 [[package]]
 name = "bincode"
-version = "1.2.1"
+version = "1.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5753e2a71534719bf3f4e57006c3a4f0d2c672a4b676eec84161f763eca87dbf"
+checksum = "f30d3a39baa26f9651f17b375061f3233dde33424a8b72b0dbe93a68a0bc896d"
 dependencies = [
  "byteorder",
  "serde",
@@ -715,9 +715,9 @@ checksum = "b328f6260a7e51bdb0ca6b68e6ea27ee3d11fba5dee930896ee7ff6ad5fc072c"
 
 [[package]]
 name = "heed-types"
-version = "0.7.0"
+version = "0.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e100387815256b00dbb4f48db990f7fa03e9b88b4a89c2a1661b7d9d77b77c46"
+checksum = "72fc61caee13e85ea330eabf0c6c7098c511ff173bcb57a760b1eda3bba9f6eb"
 dependencies = [
  "bincode",
  "heed-traits",
@@ -1335,9 +1335,9 @@ checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
 
 [[package]]
 name = "pkg-config"
-version = "0.3.17"
+version = "0.3.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "05da548ad6865900e60eaba7f589cc0783590a92e940c26953ff81ddbab2d677"
+checksum = "3831453b3449ceb48b6d9c7ad7c96d5ea673e9b470a1dc578c2ce6521230884c"
 
 [[package]]
 name = "plotters"
@@ -1907,9 +1907,9 @@ dependencies = [
 
 [[package]]
 name = "synstructure"
-version = "0.12.3"
+version = "0.12.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "67656ea1dc1b41b1451851562ea232ec2e5a80242139f7e679ceccfb5d61f545"
+checksum = "b834f2d66f734cb897113e34aaff2f1ab4719ca946f9a7358dba8f8064148701"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/src/update_store.rs b/src/update_store.rs
index 09920018f..923ab42a4 100644
--- a/src/update_store.rs
+++ b/src/update_store.rs
@@ -1,10 +1,9 @@
 use std::path::Path;
 use std::sync::Arc;
 
-use crossbeam_channel::{Sender, Receiver};
+use crossbeam_channel::Sender;
 use heed::types::{OwnedType, DecodeIgnore, SerdeJson, ByteSlice};
 use heed::{EnvOpenOptions, Env, Database};
-use once_cell::sync::OnceCell;
 use serde::{Serialize, Deserialize};
 
 use crate::BEU64;
@@ -18,7 +17,7 @@ pub struct UpdateStore<M> {
     notification_sender: Sender<()>,
 }
 
-impl<M: 'static + Send + Sync> UpdateStore<M> {
+impl<M: 'static> UpdateStore<M> {
     pub fn open<P, F>(
         mut options: EnvOpenOptions,
         path: P,