diff --git a/.paket/Paket.Restore.targets b/.paket/Paket.Restore.targets
index 0ec2816..3632ffe 100644
--- a/.paket/Paket.Restore.targets
+++ b/.paket/Paket.Restore.targets
@@ -20,18 +20,18 @@
     <PaketBootstrapperStyle Condition="Exists('$(PaketToolsPath)paket.bootstrapper.proj')">proj</PaketBootstrapperStyle>
     <PaketExeImage>assembly</PaketExeImage>
     <PaketExeImage Condition=" '$(PaketBootstrapperStyle)' == 'proj' ">native</PaketExeImage>
-    <MonoPath Condition="'$(MonoPath)' == '' AND Exists('/Library/Frameworks/Mono.framework/Commands/mono')">/Library/Frameworks/Mono.framework/Commands/mono</MonoPath>
+    <MonoPath Condition="'$(MonoPath)' == '' And Exists('/Library/Frameworks/Mono.framework/Commands/mono')">/Library/Frameworks/Mono.framework/Commands/mono</MonoPath>
     <MonoPath Condition="'$(MonoPath)' == ''">mono</MonoPath>
 
     <!-- PaketBootStrapper  -->
     <PaketBootStrapperExePath Condition=" '$(PaketBootStrapperExePath)' == '' AND Exists('$(PaketRootPath)paket.bootstrapper.exe')">$(PaketRootPath)paket.bootstrapper.exe</PaketBootStrapperExePath>
     <PaketBootStrapperExePath Condition=" '$(PaketBootStrapperExePath)' == '' ">$(PaketToolsPath)paket.bootstrapper.exe</PaketBootStrapperExePath>
     <PaketBootStrapperExeDir Condition=" Exists('$(PaketBootStrapperExePath)') " >$([System.IO.Path]::GetDirectoryName("$(PaketBootStrapperExePath)"))\</PaketBootStrapperExeDir>
-
-    <PaketBootStrapperCommand Condition=" '$(OS)' == 'Windows_NT' ">"$(PaketBootStrapperExePath)"</PaketBootStrapperCommand>
+    
+    <PaketBootStrapperCommand Condition=" '$(OS)' == 'Windows_NT'">"$(PaketBootStrapperExePath)"</PaketBootStrapperCommand>
     <PaketBootStrapperCommand Condition=" '$(OS)' != 'Windows_NT' ">$(MonoPath) --runtime=v4.0.30319 "$(PaketBootStrapperExePath)"</PaketBootStrapperCommand>
 
-    <!-- Disable automagic references for F# DotNet SDK -->
+    <!-- Disable automagic references for F# dotnet sdk -->
     <!-- This will not do anything for other project types -->
     <!-- see https://github.com/fsharp/fslang-design/blob/master/tooling/FST-1002-fsharp-in-dotnet-sdk.md -->
     <DisableImplicitFSharpCoreReference>true</DisableImplicitFSharpCoreReference>
@@ -40,68 +40,55 @@
     <!-- Disable Paket restore under NCrunch build -->
     <PaketRestoreDisabled Condition="'$(NCrunch)' == '1'">True</PaketRestoreDisabled>
 
-    <!-- Disable test for CLI tool completely - overrideable via properties in projects or via environment variables -->
-    <PaketDisableCliTest Condition=" '$(PaketDisableCliTest)' == '' ">False</PaketDisableCliTest>
-
     <PaketIntermediateOutputPath Condition=" '$(PaketIntermediateOutputPath)' == '' ">$(BaseIntermediateOutputPath.TrimEnd('\').TrimEnd('\/'))</PaketIntermediateOutputPath>
   </PropertyGroup>
 
-  <!-- Resolve how paket should be called -->
-  <!-- Current priority is: local (1: repo root, 2: .paket folder) => 3: as CLI tool => as bootstrapper (4: proj Bootstrapper style, 5: BootstrapperExeDir) => 6: global path variable -->
+  <!-- Check if paket is available as local dotnet cli tool -->
   <Target Name="SetPaketCommand" >
-    <!-- Test if paket is available in the standard locations. If so, that takes priority. Case 1/2 - non-windows specific -->
-    <PropertyGroup Condition=" '$(OS)' != 'Windows_NT' ">
-      <!-- no windows, try native paket as default, root => tool -->
-      <PaketExePath Condition=" '$(PaketExePath)' == '' AND Exists('$(PaketRootPath)paket') ">$(PaketRootPath)paket</PaketExePath>
-      <PaketExePath Condition=" '$(PaketExePath)' == '' AND Exists('$(PaketToolsPath)paket') ">$(PaketToolsPath)paket</PaketExePath>
-    </PropertyGroup>
+  
+    <!-- Call 'dotnet paket' and see if it returns without an error. Mute all the output. -->
+    <Exec Command="dotnet paket --version" IgnoreExitCode="true" StandardOutputImportance="low" StandardErrorImportance="low" >
+      <Output TaskParameter="ExitCode" PropertyName="LocalPaketToolExitCode" />
+    </Exec>
 
-    <!-- Test if paket is available in the standard locations. If so, that takes priority. Case 2/2 - same across platforms -->
-    <PropertyGroup>
-      <!-- root => tool -->
-      <PaketExePath Condition=" '$(PaketExePath)' == '' AND Exists('$(PaketRootPath)paket.exe') ">$(PaketRootPath)paket.exe</PaketExePath>
-      <PaketExePath Condition=" '$(PaketExePath)' == '' AND Exists('$(PaketToolsPath)paket.exe') ">$(PaketToolsPath)paket.exe</PaketExePath>
+    <!-- If local paket tool is found, use that -->
+    <PropertyGroup Condition=" '$(LocalPaketToolExitCode)' == '0' ">
+      <InternalPaketCommand>dotnet paket</InternalPaketCommand>
     </PropertyGroup>
 
-    <!-- If paket hasn't be found in standard locations, test for CLI tool usage. -->
-    <!-- First test: Is CLI configured to be used in "dotnet-tools.json"? - can result in a false negative; only a positive outcome is reliable. -->
-    <PropertyGroup Condition=" '$(PaketExePath)' == '' ">
-      <_DotnetToolsJson Condition="Exists('$(PaketRootPath)/.config/dotnet-tools.json')">$([System.IO.File]::ReadAllText("$(PaketRootPath)/.config/dotnet-tools.json"))</_DotnetToolsJson>
-      <_ConfigContainsPaket Condition=" '$(_DotnetToolsJson)' != ''">$(_DotnetToolsJson.Contains('"paket"'))</_ConfigContainsPaket>
-      <_ConfigContainsPaket Condition=" '$(_ConfigContainsPaket)' == ''">false</_ConfigContainsPaket>
-    </PropertyGroup>
+    <!-- If not, then we go through our normal steps of setting the Paket command.  -->
+    <PropertyGroup Condition=" '$(LocalPaketToolExitCode)' != '0' ">
+      <!-- windows, root => tool => proj style => bootstrapper => global -->
+      <PaketExePath Condition=" '$(PaketExePath)' == '' AND '$(OS)' == 'Windows_NT' AND Exists('$(PaketRootPath)paket.exe') ">$(PaketRootPath)paket.exe</PaketExePath>
+      <PaketExePath Condition=" '$(PaketExePath)' == '' AND '$(OS)' == 'Windows_NT' AND Exists('$(PaketToolsPath)paket.exe') ">$(PaketToolsPath)paket.exe</PaketExePath>
+      <PaketExePath Condition=" '$(PaketExePath)' == '' AND '$(OS)' == 'Windows_NT' AND '$(PaketBootstrapperStyle)' == 'proj' ">$(PaketToolsPath)paket.exe</PaketExePath>
+      <PaketExePath Condition=" '$(PaketExePath)' == '' AND '$(OS)' == 'Windows_NT' AND Exists('$(PaketBootStrapperExeDir)') ">$(_PaketBootStrapperExeDir)paket.exe</PaketExePath>
+      <PaketExePath Condition=" '$(PaketExePath)' == '' AND '$(OS)' == 'Windows_NT' ">paket.exe</PaketExePath>
 
-    <!-- Second test: Call 'dotnet paket' and see if it returns without an error. Mute all the output. Only run if previous test failed and the test has not been disabled. -->
-    <!-- WARNING: This method can lead to processes hanging forever, and should be used as little as possible. See https://github.com/fsprojects/Paket/issues/3705 for details. -->
-    <Exec Condition=" '$(PaketExePath)' == '' AND !$(PaketDisableCliTest) AND !$(_ConfigContainsPaket)" Command="dotnet paket --version" IgnoreExitCode="true" StandardOutputImportance="low" StandardErrorImportance="low" >
-      <Output TaskParameter="ExitCode" PropertyName="LocalPaketToolExitCode" />
-    </Exec>
+      <!-- no windows, try native paket as default,  root => tool => proj style => mono paket => bootstrpper => global -->
+      <PaketExePath Condition=" '$(PaketExePath)' == '' AND '$(OS)' != 'Windows_NT' AND Exists('$(PaketRootPath)paket') ">$(PaketRootPath)paket</PaketExePath>
+      <PaketExePath Condition=" '$(PaketExePath)' == '' AND '$(OS)' != 'Windows_NT' AND Exists('$(PaketToolsPath)paket') ">$(PaketToolsPath)paket</PaketExePath>
+      <PaketExePath Condition=" '$(PaketExePath)' == '' AND '$(OS)' != 'Windows_NT' AND '$(PaketBootstrapperStyle)' == 'proj' ">$(PaketToolsPath)paket</PaketExePath>
 
-    <!-- If paket is installed as CLI use that. Again, only if paket haven't already been found in standard locations. -->
-    <PropertyGroup Condition=" '$(PaketExePath)' == '' AND ($(_ConfigContainsPaket) OR '$(LocalPaketToolExitCode)' == '0') ">
-      <_PaketCommand>dotnet paket</_PaketCommand>
-    </PropertyGroup>
+      <!-- no windows, try mono paket -->
+      <PaketExePath Condition=" '$(PaketExePath)' == '' AND '$(OS)' != 'Windows_NT' AND Exists('$(PaketRootPath)paket.exe') ">$(PaketRootPath)paket.exe</PaketExePath>
+      <PaketExePath Condition=" '$(PaketExePath)' == '' AND '$(OS)' != 'Windows_NT' AND Exists('$(PaketToolsPath)paket.exe') ">$(PaketToolsPath)paket.exe</PaketExePath>
 
-    <!-- If neither local files nor CLI tool can be found, final attempt is searching for boostrapper config before falling back to global path variable. -->
-    <PropertyGroup Condition=" '$(PaketExePath)' == '' AND '$(_PaketCommand)' == '' ">
-      <!-- Test for bootstrapper setup -->
-      <PaketExePath Condition=" '$(PaketExePath)' == '' AND '$(PaketBootstrapperStyle)' == 'proj' ">$(PaketToolsPath)paket</PaketExePath>
-      <PaketExePath Condition=" '$(PaketExePath)' == '' AND Exists('$(PaketBootStrapperExeDir)') ">$(PaketBootStrapperExeDir)paket</PaketExePath>
+      <!-- no windows, try bootstrapper -->
+      <PaketExePath Condition=" '$(PaketExePath)' == '' AND '$(OS)' != 'Windows_NT' AND Exists('$(PaketBootStrapperExeDir)') ">$(PaketBootStrapperExeDir)paket.exe</PaketExePath>
 
-      <!-- If all else fails, use global path approach. -->
-      <PaketExePath Condition=" '$(PaketExePath)' == ''">paket</PaketExePath>
-    </PropertyGroup>
+      <!-- no windows, try global native paket -->
+      <PaketExePath Condition=" '$(PaketExePath)' == '' AND '$(OS)' != 'Windows_NT' ">paket</PaketExePath>
 
-    <!-- If not using CLI, setup correct execution command. -->
-    <PropertyGroup Condition=" '$(_PaketCommand)' == '' ">
       <_PaketExeExtension>$([System.IO.Path]::GetExtension("$(PaketExePath)"))</_PaketExeExtension>
-      <_PaketCommand Condition=" '$(_PaketCommand)' == '' AND '$(_PaketExeExtension)' == '.dll' ">dotnet "$(PaketExePath)"</_PaketCommand>
-      <_PaketCommand Condition=" '$(_PaketCommand)' == '' AND '$(OS)' != 'Windows_NT' AND '$(_PaketExeExtension)' == '.exe' ">$(MonoPath) --runtime=v4.0.30319 "$(PaketExePath)"</_PaketCommand>
-      <_PaketCommand Condition=" '$(_PaketCommand)' == '' ">"$(PaketExePath)"</_PaketCommand>
+      <InternalPaketCommand Condition=" '$(InternalPaketCommand)' == '' AND '$(_PaketExeExtension)' == '.dll' ">dotnet "$(PaketExePath)"</InternalPaketCommand>
+      <InternalPaketCommand Condition=" '$(InternalPaketCommand)' == '' AND '$(OS)' != 'Windows_NT' AND '$(_PaketExeExtension)' == '.exe' ">$(MonoPath) --runtime=v4.0.30319 "$(PaketExePath)"</InternalPaketCommand>
+      <InternalPaketCommand Condition=" '$(InternalPaketCommand)' == '' ">"$(PaketExePath)"</InternalPaketCommand>
+
     </PropertyGroup>
 
     <!-- The way to get a property to be available outside the target is to use this task. -->
-    <CreateProperty Value="$(_PaketCommand)">
+    <CreateProperty Value="$(InternalPaketCommand)">
       <Output TaskParameter="Value" PropertyName="PaketCommand"/>
     </CreateProperty>
 
@@ -136,7 +123,7 @@
         <!-- Parse our simple 'paket.restore.cached' json ...-->
         <PaketRestoreCachedSplitObject Include="$([System.Text.RegularExpressions.Regex]::Split(`$(PaketRestoreCachedContents)`, `{|}|,`))"></PaketRestoreCachedSplitObject>
         <!-- Keep Key, Value ItemGroup-->
-        <PaketRestoreCachedKeyValue Include="@(PaketRestoreCachedSplitObject)"
+        <PaketRestoreCachedKeyValue Include="@(PaketRestoreCachedSplitObject)" 
             Condition=" $([System.Text.RegularExpressions.Regex]::Split(`%(Identity)`, `&quot;: &quot;`).Length) &gt; 1 ">
           <Key>$([System.Text.RegularExpressions.Regex]::Split(`%(Identity)`, `": "`)[0].Replace(`"`, ``).Replace(` `, ``))</Key>
           <Value>$([System.Text.RegularExpressions.Regex]::Split(`%(Identity)`, `": "`)[1].Replace(`"`, ``).Replace(` `, ``))</Value>
@@ -169,7 +156,7 @@
     <Exec Command='$(PaketBootStrapperCommand)' Condition=" '$(PaketBootstrapperStyle)' == 'classic' AND Exists('$(PaketBootStrapperExePath)') AND !(Exists('$(PaketExePath)'))" ContinueOnError="false" />
     <Error Text="Stop build because of PAKET_ERROR_ON_MSBUILD_EXEC and we need a full restore (hashes don't match)" Condition=" '$(PAKET_ERROR_ON_MSBUILD_EXEC)' == 'true' AND '$(PaketRestoreRequired)' == 'true' AND '$(PaketDisableGlobalRestore)' != 'true'" />
     <Exec Command='$(PaketCommand) restore' Condition=" '$(PaketRestoreRequired)' == 'true' AND '$(PaketDisableGlobalRestore)' != 'true' " ContinueOnError="false" />
-
+    
     <!-- Step 2 Detect project specific changes -->
     <ItemGroup>
       <MyTargetFrameworks Condition="'$(TargetFramework)' != '' " Include="$(TargetFramework)"></MyTargetFrameworks>
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 578c573..6afbf9e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,12 +8,22 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+## 4.1.0 - 2020-05-16
+
+### Fixed
+
+* Avoiding aspnet core "Synchronous operations are disallowed" exception (by @MaxDeg)
+
 ## 4.0.0 - 2020-03-04
 
+### Changed
+
 * Update to Thoth.Json.Net v4
 
 ## 3.2.0
 
+### Fixed
+
 * Avoid "Synchronous operations are disallowed. Call WriteAsync or set AllowSynchronousIO to true." (by @MaxDeg)
 
 ## 3.1.0
diff --git a/src/Thoth.Json.Giraffe.fsproj b/src/Thoth.Json.Giraffe.fsproj
index 59f537d..3a65c71 100644
--- a/src/Thoth.Json.Giraffe.fsproj
+++ b/src/Thoth.Json.Giraffe.fsproj
@@ -7,7 +7,7 @@
     <RepositoryUrl>https://github.com/MangelMaxime/Thoth</RepositoryUrl>
     <PackageTags>fsharp;json;Giraffe;ASP.NET;Core</PackageTags>
     <Authors>Maxime Mangel</Authors>
-    <Version>4.0.0</Version>
+    <Version>4.1.0</Version>
   </PropertyGroup>
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0</TargetFrameworks>