diff --git a/LICENSE b/LICENSE
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2012, 2013, 2014 David Sorokin <david.sorokin@gmail.com>
+Copyright (c) 2012-2015 David Sorokin <david.sorokin@gmail.com>
 
 All rights reserved.
 
diff --git a/Simulation/Aivika/Experiment/Chart/Backend/Cairo.hs b/Simulation/Aivika/Experiment/Chart/Backend/Cairo.hs
--- a/Simulation/Aivika/Experiment/Chart/Backend/Cairo.hs
+++ b/Simulation/Aivika/Experiment/Chart/Backend/Cairo.hs
@@ -3,7 +3,7 @@
 
 -- |
 -- Module     : Simulation.Aivika.Experiment.Chart.Backend.Cairo
--- Copyright  : Copyright (c) 2012-2014, David Sorokin <david.sorokin@gmail.com>
+-- Copyright  : Copyright (c) 2012-2015, David Sorokin <david.sorokin@gmail.com>
 -- License    : BSD3
 -- Maintainer : David Sorokin <david.sorokin@gmail.com>
 -- Stability  : experimental
diff --git a/aivika-experiment-cairo.cabal b/aivika-experiment-cairo.cabal
--- a/aivika-experiment-cairo.cabal
+++ b/aivika-experiment-cairo.cabal
@@ -1,5 +1,5 @@
 name:            aivika-experiment-cairo
-version:         3.0
+version:         3.1
 synopsis:        Cairo backend for the Aivika simulation library
 description:
     This package complements the Aivika and Aivika Experiment packages 
@@ -8,7 +8,7 @@
 category:        Simulation
 license:         BSD3
 license-file:    LICENSE
-copyright:       (c) 2012-2014. David Sorokin <david.sorokin@gmail.com>
+copyright:       (c) 2012-2015. David Sorokin <david.sorokin@gmail.com>
 author:          David Sorokin
 maintainer:      David Sorokin <david.sorokin@gmail.com>
 homepage:        http://github.com/dsorokin/aivika-experiment-cairo
@@ -23,8 +23,8 @@
     build-depends:   base >= 3 && < 6,
                      Chart >= 1.3.1,
                      Chart-cairo >= 1.3.1,
-                     aivika-experiment >= 3.0,
-                     aivika-experiment-chart >= 3.0
+                     aivika-experiment >= 3.1,
+                     aivika-experiment-chart >= 3.1
 
     extensions:      MultiParamTypeClasses