diff --git a/loopy/version.py b/loopy/version.py
index 2e86b974ba224e44cbeb557556a72b82e745525d..f16d689bb823b5e7de09028f29fb91ce668a88e8 100644
--- a/loopy/version.py
+++ b/loopy/version.py
@@ -32,4 +32,4 @@ except ImportError:
 else:
     _islpy_version = islpy.version.VERSION_TEXT
 
-DATA_MODEL_VERSION = "v65-islpy%s" % _islpy_version
+DATA_MODEL_VERSION = "v66-islpy%s" % _islpy_version