diff --git a/.paket/Paket.Restore.targets b/.paket/Paket.Restore.targets
index 71367734..a86be3a1 100644
--- a/.paket/Paket.Restore.targets
+++ b/.paket/Paket.Restore.targets
@@ -18,6 +18,11 @@
     <PaketExePath Condition=" '$(PaketExePath)' == '' ">$(PaketToolsPath)paket.exe</PaketExePath>
     <PaketCommand Condition=" '$(OS)' == 'Windows_NT'">"$(PaketExePath)"</PaketCommand>
     <PaketCommand Condition=" '$(OS)' != 'Windows_NT' ">$(MonoPath) --runtime=v4.0.30319 "$(PaketExePath)"</PaketCommand>
+
+    <!-- .net core fdd -->
+    <_PaketExeExtension>$([System.IO.Path]::GetExtension("$(PaketExePath)"))</_PaketExeExtension>
+    <PaketCommand Condition=" '$(_PaketExeExtension)' == '.dll' ">dotnet "$(PaketExePath)"</PaketCommand>
+
     <PaketBootStrapperExePath Condition=" '$(PaketBootStrapperExePath)' == '' AND Exists('$(PaketRootPath)paket.bootstrapper.exe')">$(PaketRootPath)paket.bootstrapper.exe</PaketBootStrapperExePath>
     <PaketBootStrapperExePath Condition=" '$(PaketBootStrapperExePath)' == '' ">$(PaketToolsPath)paket.bootstrapper.exe</PaketBootStrapperExePath>
     <PaketBootStrapperCommand Condition=" '$(OS)' == 'Windows_NT'">"$(PaketBootStrapperExePath)"</PaketBootStrapperCommand>
diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index 0a570286..55623eb9 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -17,6 +17,12 @@
 * BUG: Ode Solver: fix typo in the Runge-Kutta solvers on time-step handling *~Ksero*
 * BUG: fix Matrix.GetHashCode for wide matrices *~mjmckp*
 
+### 3.20.1 - 2018-01-13
+* Bugfixes backported from v4:
+* BUG: Trigonometry: Fix imaginary part sign of complex hyperbolic cotangent
+* BUG: Ode Solver: fix typo in the Runge-Kutta solvers on time-step handling *~Ksero*
+* BUG: fix Matrix.GetHashCode for wide matrices *~mjmckp*
+
 ### 3.20.0 - 2017-07-15
 * Optimization: non-linear optimization algorithms *~Scott Stephens, Erik Ovegard, bdodson, et al.*
 * Native Providers: from now on also supported in the .Net 3.5 build.