diff --git a/Ev1lVaultBoysHistoricTechTree/Ev1lVaultBoysHistoricTechTree-3.1.0.ckan b/Ev1lVaultBoysHistoricTechTree/Ev1lVaultBoysHistoricTechTree-3.1.0.ckan
index bd75d3c621..af6e74b2cc 100644
--- a/Ev1lVaultBoysHistoricTechTree/Ev1lVaultBoysHistoricTechTree-3.1.0.ckan
+++ b/Ev1lVaultBoysHistoricTechTree/Ev1lVaultBoysHistoricTechTree-3.1.0.ckan
@@ -1,5 +1,5 @@
 {
-    "spec_version": "v1.18",
+    "spec_version": "v1.4",
     "identifier": "Ev1lVaultBoysHistoricTechTree",
     "name": "Ev1lVaultBoy's Historic Tech Tree",
     "abstract": "A stock tech tree revolving around propeller planes and cars/boats first",