diff --git a/frameworks/FSharp/giraffe/README.md b/frameworks/FSharp/giraffe/README.md
index dfb4a5fc5e6..aaced20e92c 100644
--- a/frameworks/FSharp/giraffe/README.md
+++ b/frameworks/FSharp/giraffe/README.md
@@ -5,7 +5,7 @@ This includes tests for plaintext and json serialization.
 
 **Language**
 
-* F# 4.1
+* F# 4.6
 
 **Platforms**
 
diff --git a/frameworks/FSharp/giraffe/giraffe-stripped.dockerfile b/frameworks/FSharp/giraffe/giraffe-stripped.dockerfile
index 09d0926bfd4..73acf6c5b0a 100644
--- a/frameworks/FSharp/giraffe/giraffe-stripped.dockerfile
+++ b/frameworks/FSharp/giraffe/giraffe-stripped.dockerfile
@@ -1,11 +1,10 @@
-FROM mcr.microsoft.com/dotnet/core/sdk:2.2 AS build
+FROM mcr.microsoft.com/dotnet/core/sdk:3.0 AS build
 WORKDIR /app
 COPY src/App .
 RUN dotnet publish -c Release -o out
 
-FROM mcr.microsoft.com/dotnet/core/aspnet:2.2 AS runtime
+FROM mcr.microsoft.com/dotnet/core/aspnet:3.0 AS runtime
 ENV ASPNETCORE_URLS http://+:8080
-ENV COMPlus_ReadyToRun 0
 WORKDIR /app
 COPY --from=build /app/out ./
 
diff --git a/frameworks/FSharp/giraffe/giraffe-utf8direct.dockerfile b/frameworks/FSharp/giraffe/giraffe-utf8direct.dockerfile
index 09d0926bfd4..73acf6c5b0a 100644
--- a/frameworks/FSharp/giraffe/giraffe-utf8direct.dockerfile
+++ b/frameworks/FSharp/giraffe/giraffe-utf8direct.dockerfile
@@ -1,11 +1,10 @@
-FROM mcr.microsoft.com/dotnet/core/sdk:2.2 AS build
+FROM mcr.microsoft.com/dotnet/core/sdk:3.0 AS build
 WORKDIR /app
 COPY src/App .
 RUN dotnet publish -c Release -o out
 
-FROM mcr.microsoft.com/dotnet/core/aspnet:2.2 AS runtime
+FROM mcr.microsoft.com/dotnet/core/aspnet:3.0 AS runtime
 ENV ASPNETCORE_URLS http://+:8080
-ENV COMPlus_ReadyToRun 0
 WORKDIR /app
 COPY --from=build /app/out ./
 
diff --git a/frameworks/FSharp/giraffe/giraffe-utf8json.dockerfile b/frameworks/FSharp/giraffe/giraffe-utf8json.dockerfile
index 09d0926bfd4..73acf6c5b0a 100644
--- a/frameworks/FSharp/giraffe/giraffe-utf8json.dockerfile
+++ b/frameworks/FSharp/giraffe/giraffe-utf8json.dockerfile
@@ -1,11 +1,10 @@
-FROM mcr.microsoft.com/dotnet/core/sdk:2.2 AS build
+FROM mcr.microsoft.com/dotnet/core/sdk:3.0 AS build
 WORKDIR /app
 COPY src/App .
 RUN dotnet publish -c Release -o out
 
-FROM mcr.microsoft.com/dotnet/core/aspnet:2.2 AS runtime
+FROM mcr.microsoft.com/dotnet/core/aspnet:3.0 AS runtime
 ENV ASPNETCORE_URLS http://+:8080
-ENV COMPlus_ReadyToRun 0
 WORKDIR /app
 COPY --from=build /app/out ./
 
diff --git a/frameworks/FSharp/giraffe/giraffe.dockerfile b/frameworks/FSharp/giraffe/giraffe.dockerfile
index 322b23b984c..17271bda28f 100644
--- a/frameworks/FSharp/giraffe/giraffe.dockerfile
+++ b/frameworks/FSharp/giraffe/giraffe.dockerfile
@@ -1,11 +1,10 @@
-FROM mcr.microsoft.com/dotnet/core/sdk:2.2 AS build
+FROM mcr.microsoft.com/dotnet/core/sdk:3.0 AS build
 WORKDIR /app
 COPY src/App .
 RUN dotnet publish -c Release -o out
 
-FROM mcr.microsoft.com/dotnet/core/aspnet:2.2 AS runtime
+FROM mcr.microsoft.com/dotnet/core/aspnet:3.0 AS runtime
 ENV ASPNETCORE_URLS http://+:8080
-ENV COMPlus_ReadyToRun 0
 WORKDIR /app
 COPY --from=build /app/out ./
 
diff --git a/frameworks/FSharp/giraffe/src/App/App.fsproj b/frameworks/FSharp/giraffe/src/App/App.fsproj
index e034ca4e748..87d64e52820 100644
--- a/frameworks/FSharp/giraffe/src/App/App.fsproj
+++ b/frameworks/FSharp/giraffe/src/App/App.fsproj
@@ -1,7 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp2.2</TargetFramework>
+    <TargetFramework>netcoreapp3.0</TargetFramework>
+    <LangVersion>preview</LangVersion>
     <DebugType>portable</DebugType>
     <AssemblyName>App</AssemblyName>
     <OutputType>Exe</OutputType>
@@ -9,13 +10,10 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Dapper" Version="1.50.5" />
-    <PackageReference Include="Microsoft.AspNetCore.Hosting" Version="2.2.0" />
-    <PackageReference Include="Microsoft.AspNetCore.Server.Kestrel" Version="2.2.0" />
-    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="2.2.0" />
-    <PackageReference Include="Giraffe" Version="3.5.0" />
-    <PackageReference Include="Npgsql" Version="4.0.4" />
-    <PackageReference Include="Utf8Json" Version="1.3.7" />
+    <PackageReference Include="Dapper" Version="1.60.6" />
+    <PackageReference Include="Giraffe" Version="3.6.0" />
+    <PackageReference Include="Npgsql" Version="4.0.9" />
+    <PackageReference Update="FSharp.Core" Version="4.7" />
   </ItemGroup>
 
   <ItemGroup>
@@ -27,8 +25,4 @@
     <Compile Include="Program.fs" />
   </ItemGroup>
 
-  <ItemGroup>
-    <PackageReference Update="FSharp.Core" Version="4.5.2" />
-  </ItemGroup>
-
-</Project> 
\ No newline at end of file
+</Project>
\ No newline at end of file
diff --git a/frameworks/FSharp/giraffe/src/App/Custom.fs b/frameworks/FSharp/giraffe/src/App/Custom.fs
index 1e6a4a0f9e3..0366dd94052 100644
--- a/frameworks/FSharp/giraffe/src/App/Custom.fs
+++ b/frameworks/FSharp/giraffe/src/App/Custom.fs
@@ -11,6 +11,7 @@ open System.IO
 
 let private DefaultCapacity = 1386
 let private MaxBuilderSize = DefaultCapacity * 3
+let private BufferSize = 27
 
 type MemoryStreamCache = 
     
@@ -43,13 +44,12 @@ let application : HttpHandler =
     let inline contentLength x = new Nullable<int64> ( int64 x )
 
     let json' data : HttpHandler =
-        let bytes = Utf8Json.JsonSerializer.Serialize(data)
         fun _ ctx -> 
-            ctx.Response.ContentLength <- contentLength bytes.Length
+            ctx.Response.ContentLength <- contentLength BufferSize
             ctx.Response.ContentType <- "application/json"
             ctx.Response.StatusCode <- 200
             task {
-                do! ctx.Response.Body.WriteAsync(bytes, 0, bytes.Length)
+                do! System.Text.Json.JsonSerializer.SerializeAsync(ctx.Response.Body, data)
                 return Some ctx
             }
 
@@ -108,7 +108,7 @@ let application : HttpHandler =
 
     routes' [
         "/plaintext", text' "Hello, World!"
-        "/json", json' { JsonStructMessage.message = "Hello, World!" }
+        "/json", json' struct {| message = "Hello, World!" |}
         "/fortunes", fortunes'
     ]
 
diff --git a/frameworks/FSharp/giraffe/src/App/Models.fs b/frameworks/FSharp/giraffe/src/App/Models.fs
index 69b5e58640b..f67b6e77db6 100644
--- a/frameworks/FSharp/giraffe/src/App/Models.fs
+++ b/frameworks/FSharp/giraffe/src/App/Models.fs
@@ -3,11 +3,6 @@
 open System.Collections.Generic
 open System
 
-type JsonMessage = { message : string }
-
-[<Struct>]
-type JsonStructMessage = { message : string }
-
  [<CLIMutable>]
 type Fortune = { id: int; message: string }
 
diff --git a/frameworks/FSharp/giraffe/src/App/Stock.fs b/frameworks/FSharp/giraffe/src/App/Stock.fs
index e8b7cf8e701..39876908f88 100644
--- a/frameworks/FSharp/giraffe/src/App/Stock.fs
+++ b/frameworks/FSharp/giraffe/src/App/Stock.fs
@@ -34,6 +34,6 @@ let application : HttpHandler =
 
     choose [
         route "/plaintext" >=> text "Hello, World!" 
-        route "/json" >=> json { JsonMessage.message = "Hello, World!" }
+        route "/json" >=> json {| message = "Hello, World!" |}
         route "/fortunes" >=> fortunes
     ]
diff --git a/frameworks/FSharp/zebra/README.md b/frameworks/FSharp/zebra/README.md
index 7f3249e8fd0..27b9a1ab6c7 100644
--- a/frameworks/FSharp/zebra/README.md
+++ b/frameworks/FSharp/zebra/README.md
@@ -7,7 +7,7 @@ Zebra is a new F# functional Asp.net Framework Wrapper that utalises a shared st
 
 **Language**
 
-* F# 4.1
+* F# 4.6
 
 **Platforms**
 
diff --git a/frameworks/FSharp/zebra/src/App/App.fsproj b/frameworks/FSharp/zebra/src/App/App.fsproj
index 6f20f4f4487..894bc209f04 100644
--- a/frameworks/FSharp/zebra/src/App/App.fsproj
+++ b/frameworks/FSharp/zebra/src/App/App.fsproj
@@ -1,7 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp2.1</TargetFramework>
+    <TargetFramework>netcoreapp3.0</TargetFramework>
+    <LangVersion>preview</LangVersion>
     <DebugType>portable</DebugType>
     <AssemblyName>App</AssemblyName>
     <OutputType>Exe</OutputType>
@@ -9,13 +10,10 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Extensions.Primitives" Version="2.2.0" />
-    <PackageReference Include="Microsoft.AspNetCore.Http" Version="2.2.0" />
-    <PackageReference Include="Microsoft.AspNetCore.Hosting" Version="2.2.0" />
-    <PackageReference Include="Microsoft.AspNetCore.Server.Kestrel" Version="2.2.0" />
-    <PackageReference Include="Dapper" Version="1.50.5" />
-    <PackageReference Include="Npgsql" Version="4.0.4" />
+    <PackageReference Include="Dapper" Version="1.60.6" />
+    <PackageReference Include="Npgsql" Version="4.0.9" />
     <PackageReference Include="Utf8Json" Version="1.3.7" />
+    <PackageReference Update="FSharp.Core" Version="4.7.0" />
   </ItemGroup>
 
   <ItemGroup>
@@ -32,8 +30,4 @@
     <Compile Include="Program.fs" />
   </ItemGroup>
 
-  <ItemGroup>
-    <PackageReference Update="FSharp.Core" Version="4.5.0" />
-  </ItemGroup>
-
 </Project>
\ No newline at end of file
diff --git a/frameworks/FSharp/zebra/zebra-simple.dockerfile b/frameworks/FSharp/zebra/zebra-simple.dockerfile
index 1786c0cd394..1a3ca04fa0b 100644
--- a/frameworks/FSharp/zebra/zebra-simple.dockerfile
+++ b/frameworks/FSharp/zebra/zebra-simple.dockerfile
@@ -1,11 +1,10 @@
-FROM mcr.microsoft.com/dotnet/core/sdk:2.2 AS build
+FROM mcr.microsoft.com/dotnet/core/sdk:3.0 AS build
 WORKDIR /app
 COPY src/App .
 RUN dotnet publish -c Release -o out
 
-FROM mcr.microsoft.com/dotnet/core/aspnet:2.2 AS runtime
+FROM mcr.microsoft.com/dotnet/core/aspnet:3.0 AS runtime
 ENV ASPNETCORE_URLS http://+:8080
-ENV COMPlus_ReadyToRun 0
 WORKDIR /app
 COPY --from=build /app/out ./
 
diff --git a/frameworks/FSharp/zebra/zebra.dockerfile b/frameworks/FSharp/zebra/zebra.dockerfile
index 09d0926bfd4..73acf6c5b0a 100644
--- a/frameworks/FSharp/zebra/zebra.dockerfile
+++ b/frameworks/FSharp/zebra/zebra.dockerfile
@@ -1,11 +1,10 @@
-FROM mcr.microsoft.com/dotnet/core/sdk:2.2 AS build
+FROM mcr.microsoft.com/dotnet/core/sdk:3.0 AS build
 WORKDIR /app
 COPY src/App .
 RUN dotnet publish -c Release -o out
 
-FROM mcr.microsoft.com/dotnet/core/aspnet:2.2 AS runtime
+FROM mcr.microsoft.com/dotnet/core/aspnet:3.0 AS runtime
 ENV ASPNETCORE_URLS http://+:8080
-ENV COMPlus_ReadyToRun 0
 WORKDIR /app
 COPY --from=build /app/out ./