diff --git a/Cargo.lock b/Cargo.lock
index 4fb93ba707b8a..759da6164059e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -13244,7 +13244,6 @@ dependencies = [
  "axum 0.7.5",
  "bcs",
  "bytes",
- "chrono",
  "clap",
  "consensus-config",
  "consensus-core",
@@ -13262,9 +13261,7 @@ dependencies = [
  "fs_extra",
  "futures",
  "im",
- "indexmap 2.2.6",
  "itertools 0.13.0",
- "jsonrpsee",
  "lru 0.10.0",
  "mockall",
  "moka",
@@ -13298,7 +13295,6 @@ dependencies = [
  "serde_with 3.9.0",
  "serde_yaml 0.8.26",
  "shared-crypto",
- "signature 1.6.4",
  "static_assertions",
  "sui-archival",
  "sui-authority-aggregation",
@@ -13325,12 +13321,10 @@ dependencies = [
  "test-fuzz",
  "thiserror 1.0.64",
  "tokio",
- "tokio-retry",
  "tokio-stream",
  "tracing",
  "twox-hash",
  "typed-store",
- "zeroize",
 ]
 
 [[package]]
@@ -16573,17 +16567,6 @@ dependencies = [
  "x509-certificate",
 ]
 
-[[package]]
-name = "tokio-retry"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7f57eb36ecbe0fc510036adff84824dd3c24bb781e21bfa67b69d556aa85214f"
-dependencies = [
- "pin-project",
- "rand 0.8.5",
- "tokio",
-]
-
 [[package]]
 name = "tokio-rustls"
 version = "0.23.4"
diff --git a/crates/sui-core/Cargo.toml b/crates/sui-core/Cargo.toml
index 1724bf0e8ca67..532b6ea3fb5a1 100644
--- a/crates/sui-core/Cargo.toml
+++ b/crates/sui-core/Cargo.toml
@@ -16,7 +16,6 @@ async-trait.workspace = true
 axum.workspace = true
 bcs.workspace = true
 bytes.workspace = true
-chrono.workspace = true
 consensus-core.workspace = true
 consensus-config.workspace = true
 count-min-sketch.workspace = true
@@ -27,9 +26,7 @@ enum_dispatch.workspace = true
 eyre.workspace = true
 futures.workspace = true
 im.workspace = true
-indexmap.workspace = true
 itertools.workspace = true
-jsonrpsee.workspace = true
 lru.workspace = true
 mockall.workspace = true
 num_cpus.workspace = true
@@ -45,13 +42,11 @@ scopeguard.workspace = true
 serde.workspace = true
 serde_json.workspace = true
 serde_with.workspace = true
-signature.workspace = true
 static_assertions.workspace = true
 tap.workspace = true
 tempfile.workspace = true
 thiserror.workspace = true
 tokio = { workspace = true, features = ["full", "tracing", "test-util"] }
-tokio-retry.workspace = true
 tokio-stream.workspace = true
 tracing.workspace = true
 twox-hash.workspace = true
@@ -89,7 +84,6 @@ sui-simulator.workspace = true
 sui-storage.workspace = true
 sui-tls.workspace = true
 sui-types.workspace = true
-zeroize.workspace = true
 nonempty.workspace = true
 
 [dev-dependencies]
@@ -113,9 +107,6 @@ sui-move.workspace = true
 pprof.workspace = true
 test-fuzz.workspace = true
 
-sui-macros.workspace = true
-sui-protocol-config.workspace = true
-
 # moka uses `quanta` by default for timing, which is not compatible with the simulator
 [target.'cfg(msim)'.dependencies]
 moka = { workspace = true, default-features = false, features = [
diff --git a/crates/sui-core/src/authority.rs b/crates/sui-core/src/authority.rs
index cde9c5bc67231..0065f970200e7 100644
--- a/crates/sui-core/src/authority.rs
+++ b/crates/sui-core/src/authority.rs
@@ -13,7 +13,6 @@ use anyhow::anyhow;
 use arc_swap::{ArcSwap, Guard};
 use async_trait::async_trait;
 use authority_per_epoch_store::CertLockGuard;
-use chrono::prelude::*;
 use fastcrypto::encoding::Base58;
 use fastcrypto::encoding::Encoding;
 use fastcrypto::hash::MultisetHash;
@@ -38,6 +37,8 @@ use std::io::Write;
 use std::path::{Path, PathBuf};
 use std::sync::atomic::Ordering;
 use std::time::Duration;
+use std::time::SystemTime;
+use std::time::UNIX_EPOCH;
 use std::{
     collections::{HashMap, HashSet},
     fs,
@@ -2667,8 +2668,11 @@ impl AuthorityState {
     }
 
     pub fn unixtime_now_ms() -> u64 {
-        let ts_ms = Utc::now().timestamp_millis();
-        u64::try_from(ts_ms).expect("Travelling in time machine")
+        let now = SystemTime::now()
+            .duration_since(UNIX_EPOCH)
+            .expect("Time went backwards")
+            .as_millis();
+        u64::try_from(now).expect("Travelling in time machine")
     }
 
     // TODO(fastpath): update this handler for Mysticeti fastpath.
diff --git a/crates/sui-core/src/checkpoints/mod.rs b/crates/sui-core/src/checkpoints/mod.rs
index 34659c2911a35..5903a9ba6004c 100644
--- a/crates/sui-core/src/checkpoints/mod.rs
+++ b/crates/sui-core/src/checkpoints/mod.rs
@@ -31,7 +31,6 @@ use sui_types::sui_system_state::epoch_start_sui_system_state::EpochStartSystemS
 
 use crate::authority::authority_per_epoch_store::AuthorityPerEpochStore;
 use crate::consensus_handler::SequencedConsensusTransactionKey;
-use chrono::Utc;
 use rand::rngs::OsRng;
 use rand::seq::SliceRandom;
 use std::collections::{BTreeMap, BTreeSet, HashMap, HashSet};
@@ -40,7 +39,7 @@ use std::io::Write;
 use std::path::Path;
 use std::sync::Arc;
 use std::sync::Weak;
-use std::time::Duration;
+use std::time::{Duration, SystemTime};
 use sui_protocol_config::ProtocolVersion;
 use sui_types::base_types::{AuthorityName, EpochId, TransactionDigest};
 use sui_types::committee::StakeUnit;
@@ -2011,7 +2010,7 @@ async fn diagnose_split_brain(
         checkpoint_seq = local_summary.sequence_number,
         "Running split brain diagnostics..."
     );
-    let time = Utc::now();
+    let time = SystemTime::now();
     // collect one random disagreeing validator per differing digest
     let digest_to_validator = all_unique_values
         .iter()
@@ -2163,7 +2162,8 @@ async fn diagnose_split_brain(
 
     let header = format!(
         "Checkpoint Fork Dump - Authority {local_validator:?}: \n\
-        Datetime: {time}",
+        Datetime: {:?}",
+        time
     );
     let fork_logs_text = format!("{header}\n\n{diff_patches}\n\n");
     let path = tempfile::tempdir()