diff --git a/src/calibre/gui2/store/stores/amazon_plugin.py b/src/calibre/gui2/store/stores/amazon_plugin.py
index 6d864b22f0..9d2c5e1368 100644
--- a/src/calibre/gui2/store/stores/amazon_plugin.py
+++ b/src/calibre/gui2/store/stores/amazon_plugin.py
@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 
 from __future__ import (unicode_literals, division, absolute_import, print_function)
-store_version = 4 # Needed for dynamic plugin loading
+store_version = 5 # Needed for dynamic plugin loading
 
 __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/gui2/store/stores/kobo_plugin.py b/src/calibre/gui2/store/stores/kobo_plugin.py
index 313ce962e5..cfa5f514b4 100644
--- a/src/calibre/gui2/store/stores/kobo_plugin.py
+++ b/src/calibre/gui2/store/stores/kobo_plugin.py
@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 
 from __future__ import (unicode_literals, division, absolute_import, print_function)
-store_version = 2 # Needed for dynamic plugin loading
+store_version = 3 # Needed for dynamic plugin loading
 
 __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/gui2/store/stores/smashwords_plugin.py b/src/calibre/gui2/store/stores/smashwords_plugin.py
index 296cd47b4e..c3e5b5d0ec 100644
--- a/src/calibre/gui2/store/stores/smashwords_plugin.py
+++ b/src/calibre/gui2/store/stores/smashwords_plugin.py
@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 
 from __future__ import (unicode_literals, division, absolute_import, print_function)
-store_version = 1 # Needed for dynamic plugin loading
+store_version = 2 # Needed for dynamic plugin loading
 
 __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'