diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index 8aef47d3..c3d4463a 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -1,3 +1,6 @@
+### 1.5.1
+* Fix version constraint issue
+
 ### 1.5.0
 * Update to FSharp.Core 4.4.1.0 (F# 4.1/VS2017 fsi.exe
 
diff --git a/paket.dependencies b/paket.dependencies
index ea8aae93..f604320d 100644
--- a/paket.dependencies
+++ b/paket.dependencies
@@ -6,7 +6,7 @@ nuget FSharp.Core >= 4.0 lowest_matching: true
 nuget FsPickler ~> 4.0
 nuget FsPickler.Json
 nuget Vagabond ~> 0.15
-nuget Argu ~> 3.3.0
+nuget Argu ~> 3.7
 nuget Thespian ~> 0.1.16-alpha
 nuget Streams
 
diff --git a/paket.lock b/paket.lock
index a0391d88..75c3db98 100644
--- a/paket.lock
+++ b/paket.lock
@@ -2,7 +2,7 @@ REDIRECTS: ON
 RESTRICTION: == net45
 NUGET
   remote: https://www.nuget.org/api/v2
-    Argu (3.3)
+    Argu (3.7)
     FSharp.Compiler.Tools (4.1.27)
     FSharp.Core (4.0.0.1)
     FsPickler (4.0.1)
diff --git a/tests/MBrace.Thespian.Tests/App.config b/tests/MBrace.Thespian.Tests/App.config
index cf59873d..07ac9227 100644
--- a/tests/MBrace.Thespian.Tests/App.config
+++ b/tests/MBrace.Thespian.Tests/App.config
@@ -7,11 +7,6 @@
     <assemblyIdentity name="System.Net.Http.Extensions" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
     <bindingRedirect oldVersion="0.0.0.0-999.999.999.999" newVersion="2.2.29.0" />
   </dependentAssembly>
-  <dependentAssembly>
-    <Paket>True</Paket>
-    <assemblyIdentity name="System.Collections.Immutable" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
-    <bindingRedirect oldVersion="0.0.0.0-65535.65535.65535.65535" newVersion="1.2.2.0" />
-  </dependentAssembly>
   <dependentAssembly>
     <assemblyIdentity name="System.Net.Http.Primitives" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
     <bindingRedirect oldVersion="0.0.0.0-999.999.999.999" newVersion="4.2.29.0" />
@@ -21,5 +16,10 @@
     <assemblyIdentity name="FSharp.Core" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
     <bindingRedirect oldVersion="0.0.0.0-65535.65535.65535.65535" newVersion="4.4.1.0" />
   </dependentAssembly>
+  <dependentAssembly>
+    <Paket>True</Paket>
+    <assemblyIdentity name="System.Collections.Immutable" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
+    <bindingRedirect oldVersion="0.0.0.0-65535.65535.65535.65535" newVersion="1.2.2.0" />
+  </dependentAssembly>
 </assemblyBinding></runtime>
 </configuration>
\ No newline at end of file