diff --git a/src/ZoneTree/Core/ZoneTree.cs b/src/ZoneTree/Core/ZoneTree.cs
index d66f2f4..afc41b1 100644
--- a/src/ZoneTree/Core/ZoneTree.cs
+++ b/src/ZoneTree/Core/ZoneTree.cs
@@ -51,8 +51,9 @@ public sealed partial class ZoneTree<TKey, TValue> : IZoneTree<TKey, TValue>, IZ
     public IReadOnlyList<IReadOnlySegment<TKey, TValue>> ReadOnlySegments =>
         ReadOnlySegmentQueue.ToArray();
 
-    public IDiskSegment<TKey, TValue> DiskSegment { get; private set; }
-        = new NullDiskSegment<TKey, TValue>();
+    volatile IDiskSegment<TKey, TValue> _diskSegment = new NullDiskSegment<TKey, TValue>();
+
+    public IDiskSegment<TKey, TValue> DiskSegment { get => _diskSegment; private set => _diskSegment = value; }
 
     public IReadOnlyList<IDiskSegment<TKey, TValue>> BottomSegments =>
         BottomSegmentQueue.ToArray();
diff --git a/src/ZoneTree/Directory.Build.props b/src/ZoneTree/Directory.Build.props
index 794d1f2..a874279 100644
--- a/src/ZoneTree/Directory.Build.props
+++ b/src/ZoneTree/Directory.Build.props
@@ -5,8 +5,8 @@
     <Authors>Ahmed Yasin Koculu</Authors>
     <PackageId>ZoneTree</PackageId>
     <Title>ZoneTree</Title>
-    <ProductVersion>1.5.0.0</ProductVersion>
-    <Version>1.5.0.0</Version>
+    <ProductVersion>1.5.1.0</ProductVersion>
+    <Version>1.5.1.0</Version>
     <Authors>Ahmed Yasin Koculu</Authors>
     <AssemblyTitle>ZoneTree</AssemblyTitle>
     <Description>ZoneTree is a persistent, high-performance, transactional, ACID-compliant ordered key-value database for NET. It can operate in memory or on local/cloud storage.</Description>