diff --git a/Pinta.Core/Pinta.Core.csproj b/Pinta.Core/Pinta.Core.csproj
index e11fd6b..e3f3e34 100644
--- a/Pinta.Core/Pinta.Core.csproj
+++ b/Pinta.Core/Pinta.Core.csproj
@@ -36,7 +36,7 @@
   <!-- References -->
   <ItemGroup>
     <Reference Condition=" '$(PINTA_MONO_POSIX_2)' == '' " Include="Mono.Posix" />
-    <Reference Condition=" '$(PINTA_MONO_POSIX_2)' != '' " Include="Mono.Posix, Version=2.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756, processorArchitecture=MSIL" />
+    <Reference Condition=" '$(PINTA_MONO_POSIX_2)' != '' " Include="Mono.Posix, Version=4.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756" />
 
     <Reference Include="atk-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f" />
     <Reference Include="gdk-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f" />
diff --git a/Pinta.Docking/Pinta.Docking.csproj b/Pinta.Docking/Pinta.Docking.csproj
index fdcbb04..1718e0c 100644
--- a/Pinta.Docking/Pinta.Docking.csproj
+++ b/Pinta.Docking/Pinta.Docking.csproj
@@ -36,7 +36,7 @@
   <!-- References -->
   <ItemGroup>
     <Reference Condition=" '$(PINTA_MONO_POSIX_2)' == '' " Include="Mono.Posix" />
-    <Reference Condition=" '$(PINTA_MONO_POSIX_2)' != '' " Include="Mono.Posix, Version=2.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756, processorArchitecture=MSIL" />
+    <Reference Condition=" '$(PINTA_MONO_POSIX_2)' != '' " Include="Mono.Posix, Version=4.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756" />
 
     <Reference Include="atk-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f" />
     <Reference Include="gdk-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f" />
diff --git a/Pinta.Effects/Pinta.Effects.csproj b/Pinta.Effects/Pinta.Effects.csproj
index 0bbdae9..b8e1790 100644
--- a/Pinta.Effects/Pinta.Effects.csproj
+++ b/Pinta.Effects/Pinta.Effects.csproj
@@ -36,7 +36,7 @@
   <!-- References -->
   <ItemGroup>
     <Reference Condition=" '$(PINTA_MONO_POSIX_2)' == '' " Include="Mono.Posix" />
-    <Reference Condition=" '$(PINTA_MONO_POSIX_2)' != '' " Include="Mono.Posix, Version=2.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756, processorArchitecture=MSIL" />
+    <Reference Condition=" '$(PINTA_MONO_POSIX_2)' != '' " Include="Mono.Posix, Version=4.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756" />
 
     <Reference Include="atk-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f" />
     <Reference Include="gdk-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f" />
diff --git a/Pinta.Gui.Widgets/Pinta.Gui.Widgets.csproj b/Pinta.Gui.Widgets/Pinta.Gui.Widgets.csproj
index 926bbb4..5429a7c 100644
--- a/Pinta.Gui.Widgets/Pinta.Gui.Widgets.csproj
+++ b/Pinta.Gui.Widgets/Pinta.Gui.Widgets.csproj
@@ -36,7 +36,7 @@
   <!-- References -->
   <ItemGroup>
     <Reference Condition=" '$(PINTA_MONO_POSIX_2)' == '' " Include="Mono.Posix" />
-    <Reference Condition=" '$(PINTA_MONO_POSIX_2)' != '' " Include="Mono.Posix, Version=2.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756, processorArchitecture=MSIL" />
+    <Reference Condition=" '$(PINTA_MONO_POSIX_2)' != '' " Include="Mono.Posix, Version=4.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756" />
 
     <Reference Include="atk-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f" />
     <Reference Include="gdk-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f" />
diff --git a/Pinta.Tools/Pinta.Tools.csproj b/Pinta.Tools/Pinta.Tools.csproj
index 50aa329..b91fccf 100644
--- a/Pinta.Tools/Pinta.Tools.csproj
+++ b/Pinta.Tools/Pinta.Tools.csproj
@@ -36,7 +36,7 @@
   <!-- References -->
   <ItemGroup>
     <Reference Condition=" '$(PINTA_MONO_POSIX_2)' == '' " Include="Mono.Posix" />
-    <Reference Condition=" '$(PINTA_MONO_POSIX_2)' != '' " Include="Mono.Posix, Version=2.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756, processorArchitecture=MSIL" />
+    <Reference Condition=" '$(PINTA_MONO_POSIX_2)' != '' " Include="Mono.Posix, Version=4.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756" />
 
     <Reference Include="atk-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f" />
     <Reference Include="gdk-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f" />
diff --git a/Pinta/Pinta.csproj b/Pinta/Pinta.csproj
index fca9445..9b1193c 100644
--- a/Pinta/Pinta.csproj
+++ b/Pinta/Pinta.csproj
@@ -35,7 +35,7 @@
 
   <ItemGroup>
     <Reference Condition=" '$(PINTA_MONO_POSIX_2)' == '' " Include="Mono.Posix" />
-    <Reference Condition=" '$(PINTA_MONO_POSIX_2)' != '' " Include="Mono.Posix, Version=2.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756, processorArchitecture=MSIL" />
+    <Reference Condition=" '$(PINTA_MONO_POSIX_2)' != '' " Include="Mono.Posix, Version=4.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756" />
 
     <Reference Include="atk-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f" />
     <Reference Include="gdk-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f" />