diff --git a/ChangeLog b/ChangeLog
index 6d910ad..8547019 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,8 +1,9 @@
-2017-01-03
+2017-02-09
 
         * Version 1.2.0 released
         ========================
 
+        Replace has_key() by in for Python 3.x compatibility (#1924)
         cslightcrv no longer accepts counts cubes on input (#1920)
         Set ctbin reference time to CTA reference time (#1922)
         Change ds9file parameter to outds9file
diff --git a/NEWS b/NEWS
index 2f7b2dd..9f587d4 100644
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,6 @@
 New Features and Important Changes in ctools 1.2.0
 
-3 February 2017
+9 February 2017
 
 
 Introduction
@@ -252,6 +252,9 @@ Examples
 --------
 Add show_lightcurve script to display a light curve.
 
+Replace has_key() by "in" in example scripts for Python 3.x compatibility
+(#1924).
+
 
 caldb
 -----
diff --git a/examples/show_sensitivity.py b/examples/show_sensitivity.py
index 0f5e6e7..7aea2c1 100755
--- a/examples/show_sensitivity.py
+++ b/examples/show_sensitivity.py
@@ -2,7 +2,7 @@
 # ==========================================================================
 # Display differential sensitivity plot generated by cssens
 #
-# Copyright (C) 2015-2016 Juergen Knoedlseder
+# Copyright (C) 2015-2017 Juergen Knoedlseder
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -62,7 +62,7 @@ def read_sensitivity(filename):
 
     # Check where file contains differential or integral sensitivity
     mode = 'Integral'
-    if sensitivity.has_key('emax'):
+    if 'emax' in sensitivity:
         emax_ref = -1.0
         for value in sensitivity['emax']:
             if emax_ref < 0.0:
@@ -76,14 +76,14 @@ def read_sensitivity(filename):
 
     # Add linear energy values
     if mode == 'Differential':
-        if sensitivity.has_key('loge'):
+        if 'loge' in sensitivity:
             name   = 'energy'
             values = []
             for value in sensitivity['loge']:
                 values.append(math.pow(10.0, value))
             sensitivity[name] = values
     else:
-        if sensitivity.has_key('emin'):
+        if 'emin' in sensitivity:
             name   = 'energy'
             values = []
             for value in sensitivity['emin']: