diff --git a/PersistentRotationUpgraded/PersistentRotationUpgraded-1.9.1.10.ckan b/PersistentRotationUpgraded/PersistentRotationUpgraded-1.9.1.10.ckan
index 0bc08ac608..df51d4f46a 100644
--- a/PersistentRotationUpgraded/PersistentRotationUpgraded-1.9.1.10.ckan
+++ b/PersistentRotationUpgraded/PersistentRotationUpgraded-1.9.1.10.ckan
@@ -1,5 +1,5 @@
 {
-    "spec_version": "v1.4",
+    "spec_version": 1,
     "identifier": "PersistentRotationUpgraded",
     "name": "PersistentRotation Upgraded",
     "abstract": "Momentum and Rotation in KSP are quite unrealistic.  This mod will maintain rotation through timewarping and changing vessels, etc.",