diff --git a/LanguageExt.CodeGen/LanguageExt.CodeGen.csproj b/LanguageExt.CodeGen/LanguageExt.CodeGen.csproj
index 5f2924c97..d0ca88889 100644
--- a/LanguageExt.CodeGen/LanguageExt.CodeGen.csproj
+++ b/LanguageExt.CodeGen/LanguageExt.CodeGen.csproj
@@ -7,7 +7,7 @@
   <!--<Sdk Name="CodeGeneration.Roslyn.Plugin.Sdk" Version="0.7.5-alpha" />-->
 
   <PropertyGroup>
-    <PackageVersion>3.5.69-beta</PackageVersion>
+    <PackageVersion>4.0.0</PackageVersion>
     <PackageId>LanguageExt.CodeGen</PackageId>
     <Title>LanguageExt.CodeGen</Title>
     <TargetFrameworks>netstandard2.0</TargetFrameworks>
@@ -23,8 +23,8 @@
     <EnableDefaultCompileItems>false</EnableDefaultCompileItems>
     <DocumentationFile></DocumentationFile>
     <OutputType>library</OutputType>
-    <AssemblyVersion>3.0.0.0</AssemblyVersion>
-    <FileVersion>3.0.0.0</FileVersion>
+    <AssemblyVersion>4.0.0.0</AssemblyVersion>
+    <FileVersion>4.0.0.0</FileVersion>
     <NoWarn>1701;1702;1705;IDE1006;CS1591;CS1573;CS1712;CS1570;CS1711;CS1572;CS1587</NoWarn>
 
   </PropertyGroup>
diff --git a/LanguageExt.Core/LanguageExt.Core.csproj b/LanguageExt.Core/LanguageExt.Core.csproj
index e1591b3ee..f37cbf481 100644
--- a/LanguageExt.Core/LanguageExt.Core.csproj
+++ b/LanguageExt.Core/LanguageExt.Core.csproj
@@ -16,7 +16,7 @@
     <DefineConstants>NETSTANDARD21</DefineConstants>
   </PropertyGroup>
   <PropertyGroup>
-    <PackageVersion>3.5.69-beta</PackageVersion>
+    <PackageVersion>4.0.0</PackageVersion>
     <PackageId>LanguageExt.Core</PackageId>
     <Title>LanguageExt.Core</Title>
     <Authors>Paul Louth</Authors>
@@ -31,8 +31,8 @@
     <EnableDefaultCompileItems>false</EnableDefaultCompileItems>
     <DocumentationFile>bin\$(Configuration)\$(TargetFramework)\$(AssemblyName).xml</DocumentationFile>
     <OutputType>library</OutputType>
-    <AssemblyVersion>3.0.0.0</AssemblyVersion>
-    <FileVersion>3.0.0.0</FileVersion>
+    <AssemblyVersion>4.0.0.0</AssemblyVersion>
+    <FileVersion>4.0.0.0</FileVersion>
     <LangVersion>default</LangVersion>
   </PropertyGroup>
 
diff --git a/LanguageExt.FSharp/LanguageExt.FSharp.csproj b/LanguageExt.FSharp/LanguageExt.FSharp.csproj
index 64b43ee82..c3a037888 100644
--- a/LanguageExt.FSharp/LanguageExt.FSharp.csproj
+++ b/LanguageExt.FSharp/LanguageExt.FSharp.csproj
@@ -8,7 +8,7 @@
     </PropertyGroup>
     <PropertyGroup>
         <TargetFrameworks>netstandard2.0;netstandard2.1</TargetFrameworks>
-        <PackageVersion>3.5.69-beta</PackageVersion>
+        <PackageVersion>4.0.0</PackageVersion>
         <PackageId>LanguageExt.FSharp</PackageId>
         <Title>LanguageExt.FSharp</Title>
         <Authors>Paul Louth</Authors>
@@ -22,8 +22,8 @@
         <EnableDefaultCompileItems>false</EnableDefaultCompileItems>
         <DocumentationFile>bin\$(Configuration)\$(TargetFramework)\$(AssemblyName).xml</DocumentationFile>
         <OutputType>library</OutputType>
-        <AssemblyVersion>3.0.0.0</AssemblyVersion>
-        <FileVersion>3.0.0.0</FileVersion>
+        <AssemblyVersion>4.0.0.0</AssemblyVersion>
+        <FileVersion>4.0.0.0</FileVersion>
         <LangVersion>8.0</LangVersion>
     </PropertyGroup>
     <ItemGroup>
diff --git a/LanguageExt.Parsec/LanguageExt.Parsec.csproj b/LanguageExt.Parsec/LanguageExt.Parsec.csproj
index 3d94c91a2..81eac0a90 100644
--- a/LanguageExt.Parsec/LanguageExt.Parsec.csproj
+++ b/LanguageExt.Parsec/LanguageExt.Parsec.csproj
@@ -8,7 +8,7 @@
     </PropertyGroup>
     <PropertyGroup>
         <TargetFrameworks>netstandard2.0;netstandard2.1</TargetFrameworks>
-        <PackageVersion>3.5.69-beta</PackageVersion>
+        <PackageVersion>4.0.0</PackageVersion>
         <PackageId>LanguageExt.Parsec</PackageId>
         <Title>LanguageExt.Parsec</Title>
         <Authors>Paul Louth</Authors>
@@ -22,8 +22,8 @@
         <EnableDefaultCompileItems>false</EnableDefaultCompileItems>
         <DocumentationFile>bin\$(Configuration)\$(TargetFramework)\$(AssemblyName).xml</DocumentationFile>
         <OutputType>library</OutputType>
-        <AssemblyVersion>3.0.0.0</AssemblyVersion>
-        <FileVersion>3.0.0.0</FileVersion>
+        <AssemblyVersion>4.0.0.0</AssemblyVersion>
+        <FileVersion>4.0.0.0</FileVersion>
         <LangVersion>default</LangVersion>
     </PropertyGroup>
     <ItemGroup>
diff --git a/LanguageExt.Rx/LanguageExt.Rx.csproj b/LanguageExt.Rx/LanguageExt.Rx.csproj
index 84623c358..4ee4b86e5 100644
--- a/LanguageExt.Rx/LanguageExt.Rx.csproj
+++ b/LanguageExt.Rx/LanguageExt.Rx.csproj
@@ -8,7 +8,7 @@
     </PropertyGroup>
     <PropertyGroup>
         <TargetFrameworks>netstandard2.0;netstandard2.1</TargetFrameworks>
-        <PackageVersion>3.5.69-beta</PackageVersion>
+        <PackageVersion>4.0.0</PackageVersion>
         <PackageId>LanguageExt.Rx</PackageId>
         <Title>LanguageExt.Rx</Title>
         <Authors>Paul Louth</Authors>
@@ -22,8 +22,8 @@
         <EnableDefaultCompileItems>false</EnableDefaultCompileItems>
         <DocumentationFile>bin\$(Configuration)\$(TargetFramework)\$(AssemblyName).xml</DocumentationFile>
         <OutputType>library</OutputType>
-        <AssemblyVersion>3.0.0.0</AssemblyVersion>
-        <FileVersion>3.0.0.0</FileVersion>
+        <AssemblyVersion>4.0.0.0</AssemblyVersion>
+        <FileVersion>4.0.0.0</FileVersion>
         <LangVersion>8.0</LangVersion>
     </PropertyGroup>
     <ItemGroup>
diff --git a/LanguageExt.Sys/LanguageExt.Sys.csproj b/LanguageExt.Sys/LanguageExt.Sys.csproj
index 84fb4b7fb..16b56ea11 100644
--- a/LanguageExt.Sys/LanguageExt.Sys.csproj
+++ b/LanguageExt.Sys/LanguageExt.Sys.csproj
@@ -4,7 +4,7 @@
         <TargetFramework>netstandard2.0</TargetFramework>
         <LangVersion>default</LangVersion>
 
-        <PackageVersion>3.5.69-beta</PackageVersion>
+        <PackageVersion>4.0.0</PackageVersion>
         <PackageId>LanguageExt.Sys</PackageId>
         <Title>LanguageExt.Sys</Title>
         <Authors>Paul Louth</Authors>
@@ -18,8 +18,8 @@
         <TargetFramework>netstandard2.0</TargetFramework>
         <EnableDefaultCompileItems>false</EnableDefaultCompileItems>
         <OutputType>library</OutputType>
-        <AssemblyVersion>3.0.0.0</AssemblyVersion>
-        <FileVersion>3.0.0.0</FileVersion>
+        <AssemblyVersion>4.0.0.0</AssemblyVersion>
+        <FileVersion>4.0.0.0</FileVersion>
         <Nullable>enable</Nullable>
     </PropertyGroup>