diff --git a/CHANGELOG.md b/CHANGELOG.md
index f34a95a..dd40082 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.6.1](https://github.com/pmcgleenon/heavykeeper-rs/compare/v0.6.0...v0.6.1) - 2025-09-02
+
+### Other
+
+- added Sync to rng
+- Merge pull request #52 from pmcgleenon/dependabot/cargo/criterion-0.7.0
+
 ## [0.6.0](https://github.com/pmcgleenon/heavykeeper-rs/compare/v0.5.1...v0.6.0) - 2025-07-27
 
 ### Other
diff --git a/Cargo.toml b/Cargo.toml
index 6a365e2..e82f6e8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "heavykeeper"
-version = "0.6.0"
+version = "0.6.1"
 edition = "2021"
 authors = [ "Patrick McGleenon"]
 description = "HeavyKeeper is for finding Top-K elephant flows with high precision and low memory footprint."
diff --git a/src/heavykeeper.rs b/src/heavykeeper.rs
index 56a322d..837adf3 100644
--- a/src/heavykeeper.rs
+++ b/src/heavykeeper.rs
@@ -75,7 +75,7 @@ pub struct TopK<T: Ord + Clone + Hash + Debug> {
     buckets: Vec<Vec<Bucket>>,
     priority_queue: TopKQueue<T>,
     hasher: RandomState,
-    random: Box<dyn RngCore + Send>,
+    random: Box<dyn RngCore + Send + Sync>,
 }
 
 pub struct Builder<T> {
@@ -85,7 +85,7 @@ pub struct Builder<T> {
     decay: Option<f64>,
     seed: Option<u64>,
     hasher: Option<RandomState>,
-    rng: Option<Box<dyn RngCore + Send>>,
+    rng: Option<Box<dyn RngCore + Send + Sync>>,
     _phantom: std::marker::PhantomData<T>,
 }
 
@@ -133,6 +133,7 @@ impl<T: Ord + Clone + Hash + Debug> TopK<T> {
         )
     }
 
+<<<<<<< HEAD
     fn with_components(
         k: usize,
         width: usize,
@@ -141,6 +142,9 @@ impl<T: Ord + Clone + Hash + Debug> TopK<T> {
         hasher: RandomState,
         rng: Box<dyn RngCore + Send>,
     ) -> Self {
+=======
+    fn with_components(k: usize, width: usize, depth: usize, decay: f64, hasher: RandomState, rng: Box<dyn RngCore + Send + Sync>) -> Self {
+>>>>>>> origin/main
         // Pre-allocate with capacity to avoid resizing
         let mut buckets = Vec::with_capacity(depth);
         for _ in 0..depth {
@@ -430,6 +434,12 @@ impl<T: Ord + Clone + Hash + Debug> Default for Builder<T> {
     }
 }
 
+impl<T: Ord + Clone + Hash + Debug> Default for Builder<T> {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl<T: Ord + Clone + Hash + Debug> Builder<T> {
     pub fn new() -> Self {
         Self {
@@ -474,7 +484,7 @@ impl<T: Ord + Clone + Hash + Debug> Builder<T> {
         self
     }
 
-    pub fn rng<R: RngCore + Send + 'static>(mut self, rng: R) -> Self {
+    pub fn rng<R: RngCore + Send + Sync + 'static>(mut self, rng: R) -> Self {
         self.rng = Some(Box::new(rng));
         self
     }