diff --git a/pub/CHANGELOG b/pub/CHANGELOG
index 371618bf5d1e0959899d0cf962df1c73f3b57741..c809980ed89bb102404293aade5a455f1ef63bce 100644
--- a/pub/CHANGELOG
+++ b/pub/CHANGELOG
@@ -1,7 +1,8 @@
-Release
+Release 2.3.1b of 22sep15
 
 - Improved functionality:
   - error estimates in 'mpa' and 'mpaf'
+  - delta fit: allow extrapolation of resolution function by zeros	
 - Code cleanup:
   - revised Find<Package>.cmake modules
 
diff --git a/pub/CMakeLists.txt b/pub/CMakeLists.txt
index 2777e713816bc3d681aceff34a295b2e166cf168..6beb7bdf19c6e584f2eaf9c0149ab7d8ad0a0c51 100644
--- a/pub/CMakeLists.txt
+++ b/pub/CMakeLists.txt
@@ -11,7 +11,7 @@ project(Frida)
 
 # --- The version number ---
 
-set(Frida_VERSION post-2.3.1a)
+set(Frida_VERSION 2.3.1b)
 
 # --- General project settings ---
 #option(FRIDA_PYTHON "Build with python support" ON)