diff --git a/Canvas.Core/Canvas.Core.csproj b/Canvas.Core/Canvas.Core.csproj
index f593424..deb0b2f 100644
--- a/Canvas.Core/Canvas.Core.csproj
+++ b/Canvas.Core/Canvas.Core.csproj
@@ -5,7 +5,7 @@
     <ImplicitUsings>disable</ImplicitUsings>
     <Nullable>disable</Nullable>
     <GeneratePackageOnBuild>True</GeneratePackageOnBuild>
-    <Version>4.5.4</Version>
+    <Version>4.5.5</Version>
     <Description>Internal package used in Canvas.Views.Web</Description>
     <Authors>artemiusgreat</Authors>
     <Copyright>indemos.com</Copyright>
diff --git a/Canvas.Core/Composers/GroupComposer.cs b/Canvas.Core/Composers/GroupComposer.cs
index 413fe61..a5c18f4 100644
--- a/Canvas.Core/Composers/GroupComposer.cs
+++ b/Canvas.Core/Composers/GroupComposer.cs
@@ -29,7 +29,7 @@ public override void Render(DimensionModel domain)
           continue;
         }
 
-        foreach (var series in seriesGroup.Groups)
+        foreach (var series in seriesGroup.Groups.ToList())
         {
           series.Value.Composer = this;
           series.Value.CreateShape(i, series.Key, Items);
@@ -54,7 +54,7 @@ protected override (double, double, double) GetExtremes(int i, double min, doubl
         return (min, max, average);
       }
 
-      foreach (var shape in series.Groups)
+      foreach (var shape in series.Groups.ToList())
       {
         shape.Value.Composer = this;
 
diff --git a/Canvas.Core/Shapes/Shape.cs b/Canvas.Core/Shapes/Shape.cs
index 8a12c16..6b12ab4 100644
--- a/Canvas.Core/Shapes/Shape.cs
+++ b/Canvas.Core/Shapes/Shape.cs
@@ -130,7 +130,7 @@ public class Shape : IShape
     /// </summary>
     public Shape()
     {
-      Groups = new ConcurrentDictionary<string, IShape>();
+      Groups = new Dictionary<string, IShape>();
     }
 
     /// <summary>
diff --git a/Canvas.Views.Web/Canvas.Views.Web.csproj b/Canvas.Views.Web/Canvas.Views.Web.csproj
index bcaed6a..3547e63 100644
--- a/Canvas.Views.Web/Canvas.Views.Web.csproj
+++ b/Canvas.Views.Web/Canvas.Views.Web.csproj
@@ -10,7 +10,7 @@
   <PropertyGroup>
     <IsPackable>true</IsPackable>
     <GeneratePackageOnBuild>True</GeneratePackageOnBuild>
-    <Version>4.5.4</Version>
+    <Version>4.5.5</Version>
     <PackageTags>finance chart opengl canvas trading gdi stock direct2d</PackageTags>
     <Authors>artemiusgreat</Authors>
     <Copyright>indemos.com</Copyright>