diff --git a/.vscode/settings.json b/.vscode/settings.json
index f4809d6b..e05e0ee2 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -4,20 +4,6 @@
         "CARGO_TARGET_DIR": "target/ra"
     },
     "cSpell.words": [
-        "CLFU",
-        "Deque",
-        "Deques",
-        "Einziger",
-        "Eytan",
-        "Hasher",
-        "Kawano",
-        "MSRV",
-        "Moka",
-        "Ohad",
-        "RUSTFLAGS",
-        "Ristretto",
-        "Tatsuya",
-        "Upsert",
         "aarch",
         "actix",
         "ahash",
@@ -29,7 +15,9 @@
         "deqs",
         "Deque",
         "Deques",
+        "Einziger",
         "else's",
+        "Eytan",
         "getrandom",
         "Hasher",
         "Kawano",
@@ -38,6 +26,7 @@
         "MSRV",
         "nanos",
         "nocapture",
+        "Ohad",
         "peekable",
         "preds",
         "reqwest",
diff --git a/Cargo.toml b/Cargo.toml
index d680d37a..006f25ee 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -33,6 +33,7 @@ atomic64 = []
 
 [dependencies]
 crossbeam-channel = "0.5"
+crossbeam-utils = "0.8"
 moka-cht = "0.4.2"
 num_cpus = "1.13"
 once_cell = "1.7"
diff --git a/src/future/builder.rs b/src/future/builder.rs
index 23f60dcd..28b04b44 100644
--- a/src/future/builder.rs
+++ b/src/future/builder.rs
@@ -203,7 +203,6 @@ impl<K, V, C> CacheBuilder<K, V, C> {
 mod tests {
     use super::CacheBuilder;
 
-    use super::Cache;
     use std::time::Duration;
 
     #[tokio::test]
@@ -237,7 +236,7 @@ mod tests {
     #[should_panic(expected = "time_to_live is longer than 1000 years")]
     async fn build_cache_too_long_ttl() {
         let thousand_years_secs: u64 = 1000 * 365 * 24 * 3600;
-        let builder: CacheBuilder<Cache<char, String>> = CacheBuilder::new(100);
+        let builder: CacheBuilder<char, String, _> = CacheBuilder::new(100);
         let duration = Duration::from_secs(thousand_years_secs);
         builder
             .time_to_live(duration + Duration::from_secs(1))
@@ -248,7 +247,7 @@ mod tests {
     #[should_panic(expected = "time_to_idle is longer than 1000 years")]
     async fn build_cache_too_long_tti() {
         let thousand_years_secs: u64 = 1000 * 365 * 24 * 3600;
-        let builder: CacheBuilder<Cache<char, String>> = CacheBuilder::new(100);
+        let builder: CacheBuilder<char, String, _> = CacheBuilder::new(100);
         let duration = Duration::from_secs(thousand_years_secs);
         builder
             .time_to_idle(duration + Duration::from_secs(1))
diff --git a/src/sync/base_cache.rs b/src/sync/base_cache.rs
index 6d004995..b8ab1089 100644
--- a/src/sync/base_cache.rs
+++ b/src/sync/base_cache.rs
@@ -14,8 +14,8 @@ use crate::{
     },
     PredicateError,
 };
-
 use crossbeam_channel::{Receiver, Sender, TrySendError};
+use crossbeam_utils::atomic::AtomicCell;
 use parking_lot::{Mutex, RwLock};
 use smallvec::SmallVec;
 use std::{
@@ -400,8 +400,8 @@ impl EntrySizeAndFrequency {
 }
 
 struct RawTimestamps {
-    last_accessed: Arc<AtomicU64>,
-    last_modified: Arc<AtomicU64>,
+    last_accessed: Arc<AtomicInstant>,
+    last_modified: Arc<AtomicInstant>,
 }
 
 impl RawTimestamps {
@@ -432,7 +432,7 @@ type CacheEntry<K, V> = (Arc<K>, Arc<ValueEntry<K, V>>);
 
 pub(crate) struct Inner<K, V, S> {
     max_capacity: Option<u64>,
-    weighted_size: AtomicU64,
+    weighted_size: AtomicCell<u64>,
     cache: CacheStore<K, V, S>,
     build_hasher: S,
     deques: Mutex<Deques<K>>,
@@ -481,14 +481,14 @@ where
 
         // Ensure skt_capacity fits in a range of `128u32..=u32::MAX`.
         let skt_capacity = max_capacity
-            .map(|n| n.try_into().unwrap_or_default()) // Convert to u32.
-            .unwrap_or(u32::MAX)
+            .map(|n| n.try_into().unwrap_or(u32::MAX)) // Convert to u32.
+            .unwrap_or_default()
             .max(128);
         let frequency_sketch = FrequencySketch::with_capacity(skt_capacity);
 
         Self {
             max_capacity: max_capacity.map(|n| n as u64),
-            weighted_size: AtomicU64::default(),
+            weighted_size: AtomicCell::default(),
             cache,
             build_hasher,
             deques: Mutex::new(Deques::default()),
@@ -657,7 +657,7 @@ where
         let mut calls = 0;
         let mut should_sync = true;
 
-        let current_ws = self.weighted_size.load(Ordering::Acquire);
+        let current_ws = self.weighted_size.load();
         let mut ws = WeightedSize {
             size: current_ws,
             weigher: self.weigher.as_ref(),
@@ -695,8 +695,8 @@ where
             }
         }
 
-        debug_assert_eq!(self.weighted_size.load(Ordering::Acquire), current_ws);
-        self.weighted_size.store(ws.size, Ordering::Release);
+        debug_assert_eq!(self.weighted_size.load(), current_ws);
+        self.weighted_size.store(ws.size);
 
         if should_sync {
             Some(SyncPace::Fast)
@@ -1291,7 +1291,7 @@ mod tests {
 
         let ensure_sketch_len = |max_capacity, len, name| {
             let cache = BaseCache::<u8, u8>::new(
-                max_capacity,
+                Some(max_capacity),
                 None,
                 RandomState::default(),
                 None,
diff --git a/src/sync/builder.rs b/src/sync/builder.rs
index 00edbc8a..066bb34a 100644
--- a/src/sync/builder.rs
+++ b/src/sync/builder.rs
@@ -265,7 +265,6 @@ impl<K, V, C> CacheBuilder<K, V, C> {
 
 #[cfg(test)]
 mod tests {
-    use super::Cache;
     use super::CacheBuilder;
 
     use std::time::Duration;
@@ -329,7 +328,7 @@ mod tests {
     #[should_panic(expected = "time_to_live is longer than 1000 years")]
     async fn build_cache_too_long_ttl() {
         let thousand_years_secs: u64 = 1000 * 365 * 24 * 3600;
-        let builder: CacheBuilder<Cache<char, String>> = CacheBuilder::new(100);
+        let builder: CacheBuilder<char, String, _> = CacheBuilder::new(100);
         let duration = Duration::from_secs(thousand_years_secs);
         builder
             .time_to_live(duration + Duration::from_secs(1))
@@ -340,7 +339,7 @@ mod tests {
     #[should_panic(expected = "time_to_idle is longer than 1000 years")]
     async fn build_cache_too_long_tti() {
         let thousand_years_secs: u64 = 1000 * 365 * 24 * 3600;
-        let builder: CacheBuilder<Cache<char, String>> = CacheBuilder::new(100);
+        let builder: CacheBuilder<char, String, _> = CacheBuilder::new(100);
         let duration = Duration::from_secs(thousand_years_secs);
         builder
             .time_to_idle(duration + Duration::from_secs(1))
diff --git a/src/unsync/builder.rs b/src/unsync/builder.rs
index 034d3c38..ab05d9a0 100644
--- a/src/unsync/builder.rs
+++ b/src/unsync/builder.rs
@@ -170,7 +170,6 @@ impl<K, V, C> CacheBuilder<K, V, C> {
 
 #[cfg(test)]
 mod tests {
-    use super::Cache;
     use super::CacheBuilder;
 
     use std::time::Duration;
@@ -204,7 +203,7 @@ mod tests {
     #[should_panic(expected = "time_to_live is longer than 1000 years")]
     async fn build_cache_too_long_ttl() {
         let thousand_years_secs: u64 = 1000 * 365 * 24 * 3600;
-        let builder: CacheBuilder<Cache<char, String>> = CacheBuilder::new(100);
+        let builder: CacheBuilder<char, String, _> = CacheBuilder::new(100);
         let duration = Duration::from_secs(thousand_years_secs);
         builder
             .time_to_live(duration + Duration::from_secs(1))
@@ -215,7 +214,7 @@ mod tests {
     #[should_panic(expected = "time_to_idle is longer than 1000 years")]
     async fn build_cache_too_long_tti() {
         let thousand_years_secs: u64 = 1000 * 365 * 24 * 3600;
-        let builder: CacheBuilder<Cache<char, String>> = CacheBuilder::new(100);
+        let builder: CacheBuilder<char, String, _> = CacheBuilder::new(100);
         let duration = Duration::from_secs(thousand_years_secs);
         builder
             .time_to_idle(duration + Duration::from_secs(1))
diff --git a/src/unsync/cache.rs b/src/unsync/cache.rs
index cae88ff2..2a2d48a4 100644
--- a/src/unsync/cache.rs
+++ b/src/unsync/cache.rs
@@ -165,8 +165,8 @@ where
 
         // Ensure skt_capacity fits in a range of `128u32..=u32::MAX`.
         let skt_capacity = max_capacity
-            .map(|n| n.try_into().unwrap_or_default()) // Convert to u32.
-            .unwrap_or(u32::MAX)
+            .map(|n| n.try_into().unwrap_or(u32::MAX)) // Convert to u32.
+            .unwrap_or_default()
             .max(128);
         let frequency_sketch = FrequencySketch::with_capacity(skt_capacity);
         Self {