diff --git a/paket.dependencies b/paket.dependencies
index f353aa1..24e2405 100644
--- a/paket.dependencies
+++ b/paket.dependencies
@@ -4,6 +4,8 @@ source https://api.nuget.org/v3/index.json
 
 nuget Aardvark.Build                    ~> 1.0.19
 
+nuget FSharp.Core                       >= 5.0.1 lowest_matching: true
+
 // Aardvark Base
 nuget Aardvark.Base                     ~> 5.2.4
 
@@ -23,6 +25,14 @@ nuget Xbim.Geometry                     ~> 5.1.437
 nuget Xbim.Geometry.Engine.Interop      ~> 5.1.437
 nuget Xbim.ModelGeometry.Scene          ~> 5.1.437
 
+nuget Microsoft.Extensions.Logging                          >= 2.1.1 lowest_matching: true             
+nuget Microsoft.Extensions.Logging.Abstractions             >= 2.1.1 lowest_matching: true
+nuget Microsoft.Extensions.Configuration.Abstractions       >= 2.1.1 lowest_matching: true
+nuget Microsoft.Extensions.Configuration.Binder             >= 2.1.1 lowest_matching: true
+nuget Microsoft.Extensions.DependencyInjection.Abstractions >= 2.1.1 lowest_matching: true
+nuget Microsoft.Extensions.Options                          >= 2.1.1 lowest_matching: true
+nuget Microsoft.Extensions.Primitives                       >= 2.1.1 lowest_matching: true 
+
 group Test
     framework: auto-detect
     source https://api.nuget.org/v3/index.json
diff --git a/paket.lock b/paket.lock
index 9c463d1..49e6d3b 100644
--- a/paket.lock
+++ b/paket.lock
@@ -74,7 +74,7 @@ NUGET
       Aardvark.Base.FSharp (>= 5.2.19 < 5.3)
       FSharp.Core (>= 5.0)
       FsPickler (>= 5.3.2 < 5.4)
-    FSharp.Core (8.0.200)
+    FSharp.Core (5.0.1)
     FSharp.Data.Adaptive (1.2.15)
       FSharp.Core (>= 4.7)
       System.Reflection.Emit.Lightweight (>= 4.6)
@@ -83,31 +83,25 @@ NUGET
     ManagedEsent (2.0)
     Microsoft.Bcl.AsyncInterfaces (8.0)
       System.Threading.Tasks.Extensions (>= 4.5.4)
-    Microsoft.Extensions.DependencyInjection (8.0)
-      Microsoft.Bcl.AsyncInterfaces (>= 8.0)
-      Microsoft.Extensions.DependencyInjection.Abstractions (>= 8.0)
-      System.Threading.Tasks.Extensions (>= 4.5.4)
-    Microsoft.Extensions.DependencyInjection.Abstractions (8.0.1)
-      Microsoft.Bcl.AsyncInterfaces (>= 8.0)
-      System.Threading.Tasks.Extensions (>= 4.5.4)
-    Microsoft.Extensions.Logging (8.0)
-      Microsoft.Bcl.AsyncInterfaces (>= 8.0)
-      Microsoft.Extensions.DependencyInjection (>= 8.0)
-      Microsoft.Extensions.Logging.Abstractions (>= 8.0)
-      Microsoft.Extensions.Options (>= 8.0)
-      System.Diagnostics.DiagnosticSource (>= 8.0)
-      System.ValueTuple (>= 4.5)
-    Microsoft.Extensions.Logging.Abstractions (8.0.1)
-      Microsoft.Extensions.DependencyInjection.Abstractions (>= 8.0.1)
-      System.Buffers (>= 4.5.1)
-      System.Memory (>= 4.5.5)
-    Microsoft.Extensions.Options (8.0.2)
-      Microsoft.Extensions.DependencyInjection.Abstractions (>= 8.0)
-      Microsoft.Extensions.Primitives (>= 8.0)
-      System.ValueTuple (>= 4.5)
-    Microsoft.Extensions.Primitives (8.0)
-      System.Memory (>= 4.5.5)
-      System.Runtime.CompilerServices.Unsafe (>= 6.0)
+    Microsoft.Extensions.Configuration (2.1.1)
+      Microsoft.Extensions.Configuration.Abstractions (>= 2.1.1)
+    Microsoft.Extensions.Configuration.Abstractions (2.1.1)
+      Microsoft.Extensions.Primitives (>= 2.1.1)
+    Microsoft.Extensions.Configuration.Binder (2.1.1)
+      Microsoft.Extensions.Configuration (>= 2.1.1)
+    Microsoft.Extensions.DependencyInjection.Abstractions (2.1.1)
+    Microsoft.Extensions.Logging (2.1.1)
+      Microsoft.Extensions.Configuration.Binder (>= 2.1.1)
+      Microsoft.Extensions.DependencyInjection.Abstractions (>= 2.1.1)
+      Microsoft.Extensions.Logging.Abstractions (>= 2.1.1)
+      Microsoft.Extensions.Options (>= 2.1.1)
+    Microsoft.Extensions.Logging.Abstractions (2.1.1)
+    Microsoft.Extensions.Options (2.1.1)
+      Microsoft.Extensions.DependencyInjection.Abstractions (>= 2.1.1)
+      Microsoft.Extensions.Primitives (>= 2.1.1)
+    Microsoft.Extensions.Primitives (2.1.1)
+      System.Memory (>= 4.5.1)
+      System.Runtime.CompilerServices.Unsafe (>= 4.5.1)
     SixLabors.ImageSharp (2.1.8)
       System.Buffers (>= 4.5.1)
       System.Memory (>= 4.5.4)
@@ -118,9 +112,6 @@ NUGET
     System.Collections.Immutable (8.0)
       System.Memory (>= 4.5.5)
       System.Runtime.CompilerServices.Unsafe (>= 6.0)
-    System.Diagnostics.DiagnosticSource (8.0.1)
-      System.Memory (>= 4.5.5)
-      System.Runtime.CompilerServices.Unsafe (>= 6.0)
     System.Dynamic.Runtime (4.3)
     System.Memory (4.5.5)
       System.Buffers (>= 4.5.1)