diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index 2f9788b..4e7d916 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -1,3 +1,8 @@
+### 4.0.0-beta1
+* Add type coloring
+* Fix type variable bug (#139)
+* Improve performance
+
 ### 3.0.4
 * Fix print bugs (generic method and generic type abbreviation)
 
diff --git a/src/FSharpApiSearch.Console/AssemblyInfo.fs b/src/FSharpApiSearch.Console/AssemblyInfo.fs
index b87735e..9a9472a 100644
--- a/src/FSharpApiSearch.Console/AssemblyInfo.fs
+++ b/src/FSharpApiSearch.Console/AssemblyInfo.fs
@@ -5,8 +5,8 @@ open System.Reflection
 [<assembly: AssemblyTitleAttribute("FSharpApiSearch.Console")>]
 [<assembly: AssemblyProductAttribute("FSharpApiSearch")>]
 [<assembly: AssemblyDescriptionAttribute("F# API search engine")>]
-[<assembly: AssemblyVersionAttribute("3.0.4")>]
-[<assembly: AssemblyFileVersionAttribute("3.0.4")>]
+[<assembly: AssemblyVersionAttribute("4.0.0")>]
+[<assembly: AssemblyFileVersionAttribute("4.0.0")>]
 [<assembly: AssemblyConfigurationAttribute("Release")>]
 do ()
 
@@ -14,6 +14,6 @@ module internal AssemblyVersionInformation =
     let [<Literal>] AssemblyTitle = "FSharpApiSearch.Console"
     let [<Literal>] AssemblyProduct = "FSharpApiSearch"
     let [<Literal>] AssemblyDescription = "F# API search engine"
-    let [<Literal>] AssemblyVersion = "3.0.4"
-    let [<Literal>] AssemblyFileVersion = "3.0.4"
+    let [<Literal>] AssemblyVersion = "4.0.0"
+    let [<Literal>] AssemblyFileVersion = "4.0.0"
     let [<Literal>] AssemblyConfiguration = "Release"
diff --git a/src/FSharpApiSearch.Database/AssemblyInfo.fs b/src/FSharpApiSearch.Database/AssemblyInfo.fs
index 6d92dbf..aa298e5 100644
--- a/src/FSharpApiSearch.Database/AssemblyInfo.fs
+++ b/src/FSharpApiSearch.Database/AssemblyInfo.fs
@@ -5,8 +5,8 @@ open System.Reflection
 [<assembly: AssemblyTitleAttribute("FSharpApiSearch.Database")>]
 [<assembly: AssemblyProductAttribute("FSharpApiSearch")>]
 [<assembly: AssemblyDescriptionAttribute("F# API search engine")>]
-[<assembly: AssemblyVersionAttribute("3.0.4")>]
-[<assembly: AssemblyFileVersionAttribute("3.0.4")>]
+[<assembly: AssemblyVersionAttribute("4.0.0")>]
+[<assembly: AssemblyFileVersionAttribute("4.0.0")>]
 [<assembly: AssemblyConfigurationAttribute("Release")>]
 do ()
 
@@ -14,6 +14,6 @@ module internal AssemblyVersionInformation =
     let [<Literal>] AssemblyTitle = "FSharpApiSearch.Database"
     let [<Literal>] AssemblyProduct = "FSharpApiSearch"
     let [<Literal>] AssemblyDescription = "F# API search engine"
-    let [<Literal>] AssemblyVersion = "3.0.4"
-    let [<Literal>] AssemblyFileVersion = "3.0.4"
+    let [<Literal>] AssemblyVersion = "4.0.0"
+    let [<Literal>] AssemblyFileVersion = "4.0.0"
     let [<Literal>] AssemblyConfiguration = "Release"
diff --git a/src/FSharpApiSearch/AssemblyInfo.fs b/src/FSharpApiSearch/AssemblyInfo.fs
index 5d0b48d..28aeb3d 100644
--- a/src/FSharpApiSearch/AssemblyInfo.fs
+++ b/src/FSharpApiSearch/AssemblyInfo.fs
@@ -5,8 +5,8 @@ open System.Reflection
 [<assembly: AssemblyTitleAttribute("FSharpApiSearch")>]
 [<assembly: AssemblyProductAttribute("FSharpApiSearch")>]
 [<assembly: AssemblyDescriptionAttribute("F# API search engine")>]
-[<assembly: AssemblyVersionAttribute("3.0.4")>]
-[<assembly: AssemblyFileVersionAttribute("3.0.4")>]
+[<assembly: AssemblyVersionAttribute("4.0.0")>]
+[<assembly: AssemblyFileVersionAttribute("4.0.0")>]
 [<assembly: AssemblyConfigurationAttribute("Release")>]
 do ()
 
@@ -14,6 +14,6 @@ module internal AssemblyVersionInformation =
     let [<Literal>] AssemblyTitle = "FSharpApiSearch"
     let [<Literal>] AssemblyProduct = "FSharpApiSearch"
     let [<Literal>] AssemblyDescription = "F# API search engine"
-    let [<Literal>] AssemblyVersion = "3.0.4"
-    let [<Literal>] AssemblyFileVersion = "3.0.4"
+    let [<Literal>] AssemblyVersion = "4.0.0"
+    let [<Literal>] AssemblyFileVersion = "4.0.0"
     let [<Literal>] AssemblyConfiguration = "Release"