diff --git a/CHANGELOG.md b/CHANGELOG.md
index 814a25a..b7791a9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,8 +1,9 @@
 # Changelog for CodeProject.ObjectPool #
 
-### v3.0.4 (2017-06-24) ###
+### v3.1.0 (2017-06-24) ###
 
 * Removed dependency on Thrower.
+* Pooled objects can now specify a validation step (PR#4 by uliian).
 * Removed CannotResetStateException class, not needed with new validation step.
 
 ### v3.0.3 (2017-04-08) ###
diff --git a/README.md b/README.md
index 20ecfe4..f4cecdc 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@
 
 ## Summary ##
 
-* Latest release version: `v3.0.4`
+* Latest release version: `v3.1.0`
 * Build status on [AppVeyor](https://ci.appveyor.com): [![Build status](https://ci.appveyor.com/api/projects/status/r4qnqaqj9ri6cicn?svg=true)](https://ci.appveyor.com/project/pomma89/objectpool)
 * [Doxygen](http://www.stack.nl/~dimitri/doxygen/index.html) documentation: 
     + [HTML](http://pomma89.altervista.org/objectpool/doc/html/index.html)
diff --git a/appveyor.yml b/appveyor.yml
index 510cd1d..c7df853 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -9,7 +9,7 @@
 #---------------------------------#
 
 # version format
-version: 3.0.4.{build}
+version: 3.1.0.{build}
 
 # branches to build
 branches:
@@ -25,7 +25,7 @@ branches:
 assembly_info:
   patch: true
   file: AssemblyInfo.*
-  assembly_version: "3.0.4.{build}"
+  assembly_version: "3.1.0.{build}"
   assembly_file_version: "{version}"
   assembly_informational_version: "{version}"
 
diff --git a/src/CodeProject.ObjectPool/CodeProject.ObjectPool.csproj b/src/CodeProject.ObjectPool/CodeProject.ObjectPool.csproj
index 195679d..93f9b05 100644
--- a/src/CodeProject.ObjectPool/CodeProject.ObjectPool.csproj
+++ b/src/CodeProject.ObjectPool/CodeProject.ObjectPool.csproj
@@ -2,7 +2,7 @@
   <PropertyGroup>
     <AssemblyName>CodeProject.ObjectPool</AssemblyName>
     <AssemblyTitle>Generic and concurrent Object Pool</AssemblyTitle>
-    <VersionPrefix>3.0.4</VersionPrefix>
+    <VersionPrefix>3.1.0</VersionPrefix>
     <TargetFrameworks>netstandard1.0;netstandard1.3;net35;net40;net45</TargetFrameworks>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <AssemblyOriginatorKeyFile>../../pomma89.snk</AssemblyOriginatorKeyFile>
diff --git a/src/CodeProject.ObjectPool/doxyfile.txt b/src/CodeProject.ObjectPool/doxyfile.txt
index 487a6f4..bcbf193 100644
--- a/src/CodeProject.ObjectPool/doxyfile.txt
+++ b/src/CodeProject.ObjectPool/doxyfile.txt
@@ -38,7 +38,7 @@ PROJECT_NAME           = "Generic and concurrent Object Pool"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 3.0.4
+PROJECT_NUMBER         = 3.1.0
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a