diff --git a/OpenDiablo2.Common/OpenDiablo2.Common.csproj b/OpenDiablo2.Common/OpenDiablo2.Common.csproj
index e676f4c5..20c62078 100644
--- a/OpenDiablo2.Common/OpenDiablo2.Common.csproj
+++ b/OpenDiablo2.Common/OpenDiablo2.Common.csproj
@@ -43,9 +43,7 @@
       <HintPath>..\packages\log4net.2.0.8\lib\net45-full\log4net.dll</HintPath>
     </Reference>
     <Reference Include="System" />
-    <Reference Include="System.Collections.Immutable, Version=1.2.3.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
-      <HintPath>..\packages\System.Collections.Immutable.1.5.0\lib\netstandard2.0\System.Collections.Immutable.dll</HintPath>
-    </Reference>
+    <Reference Include="System.Collections.Immutable, Version=1.2.3.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL" />
     <Reference Include="System.Core" />
     <Reference Include="System.Drawing" />
     <Reference Include="System.Runtime.Caching" />
diff --git a/OpenDiablo2.Core/OpenDiablo2.Core.csproj b/OpenDiablo2.Core/OpenDiablo2.Core.csproj
index 99efda36..e5728af7 100644
--- a/OpenDiablo2.Core/OpenDiablo2.Core.csproj
+++ b/OpenDiablo2.Core/OpenDiablo2.Core.csproj
@@ -42,9 +42,7 @@
       <HintPath>..\packages\Newtonsoft.Json.12.0.1\lib\net45\Newtonsoft.Json.dll</HintPath>
     </Reference>
     <Reference Include="System" />
-    <Reference Include="System.Collections.Immutable, Version=1.2.3.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
-      <HintPath>..\packages\System.Collections.Immutable.1.5.0\lib\netstandard2.0\System.Collections.Immutable.dll</HintPath>
-    </Reference>
+    <Reference Include="System.Collections.Immutable, Version=1.2.3.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL" />
     <Reference Include="System.Core" />
     <Reference Include="System.Drawing" />
     <Reference Include="System.Runtime.Caching" />
diff --git a/OpenDiablo2.GameServer/OpenDiablo2.GameServer.csproj b/OpenDiablo2.GameServer/OpenDiablo2.GameServer.csproj
index 1ab2ded2..09807f12 100644
--- a/OpenDiablo2.GameServer/OpenDiablo2.GameServer.csproj
+++ b/OpenDiablo2.GameServer/OpenDiablo2.GameServer.csproj
@@ -39,9 +39,7 @@
       <HintPath>..\packages\log4net.2.0.8\lib\net45-full\log4net.dll</HintPath>
     </Reference>
     <Reference Include="System" />
-    <Reference Include="System.Collections.Immutable, Version=1.2.3.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
-      <HintPath>..\packages\System.Collections.Immutable.1.5.0\lib\netstandard2.0\System.Collections.Immutable.dll</HintPath>
-    </Reference>
+    <Reference Include="System.Collections.Immutable, Version=1.2.3.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL" />
     <Reference Include="System.Core" />
     <Reference Include="System.Drawing" />
     <Reference Include="System.Xml.Linq" />
diff --git a/OpenDiablo2.MapGenerators/OpenDiablo2.MapGenerators.csproj b/OpenDiablo2.MapGenerators/OpenDiablo2.MapGenerators.csproj
index 3e65ec19..c6bd15e1 100644
--- a/OpenDiablo2.MapGenerators/OpenDiablo2.MapGenerators.csproj
+++ b/OpenDiablo2.MapGenerators/OpenDiablo2.MapGenerators.csproj
@@ -39,9 +39,7 @@
       <HintPath>..\packages\log4net.2.0.8\lib\net45-full\log4net.dll</HintPath>
     </Reference>
     <Reference Include="System" />
-    <Reference Include="System.Collections.Immutable, Version=1.2.3.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
-      <HintPath>..\packages\System.Collections.Immutable.1.5.0\lib\netstandard2.0\System.Collections.Immutable.dll</HintPath>
-    </Reference>
+    <Reference Include="System.Collections.Immutable, Version=1.2.3.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL" />
     <Reference Include="System.Core" />
     <Reference Include="System.Drawing" />
     <Reference Include="System.Xml.Linq" />
diff --git a/OpenDiablo2.TestConsole/OpenDiablo2.TestConsole.csproj b/OpenDiablo2.TestConsole/OpenDiablo2.TestConsole.csproj
index c38b6cb1..0b855201 100644
--- a/OpenDiablo2.TestConsole/OpenDiablo2.TestConsole.csproj
+++ b/OpenDiablo2.TestConsole/OpenDiablo2.TestConsole.csproj
@@ -34,9 +34,7 @@
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="System" />
-    <Reference Include="System.Collections.Immutable, Version=1.2.3.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
-      <HintPath>..\packages\System.Collections.Immutable.1.5.0\lib\netstandard2.0\System.Collections.Immutable.dll</HintPath>
-    </Reference>
+    <Reference Include="System.Collections.Immutable, Version=1.2.3.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL" />
     <Reference Include="System.Core" />
     <Reference Include="System.Xml.Linq" />
     <Reference Include="System.Data.DataSetExtensions" />
diff --git a/OpenDiablo2/OpenDiablo2.csproj b/OpenDiablo2/OpenDiablo2.csproj
index bebfaffa..51eb16aa 100644
--- a/OpenDiablo2/OpenDiablo2.csproj
+++ b/OpenDiablo2/OpenDiablo2.csproj
@@ -63,9 +63,7 @@
       <HintPath>..\packages\log4net.2.0.8\lib\net45-full\log4net.dll</HintPath>
     </Reference>
     <Reference Include="System" />
-    <Reference Include="System.Collections.Immutable, Version=1.2.3.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
-      <HintPath>..\packages\System.Collections.Immutable.1.5.0\lib\netstandard2.0\System.Collections.Immutable.dll</HintPath>
-    </Reference>
+    <Reference Include="System.Collections.Immutable, Version=1.2.3.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL"/>
     <Reference Include="System.ComponentModel.Composition" />
     <Reference Include="System.Console, Version=4.0.1.1, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
       <HintPath>..\packages\System.Console.4.3.1\lib\net46\System.Console.dll</HintPath>