diff --git a/SSTOProject/SSTOProject-1.3.1.ckan b/SSTOProject/SSTOProject-1.3.1.ckan
index 0c5756cebb..44162b9a88 100644
--- a/SSTOProject/SSTOProject-1.3.1.ckan
+++ b/SSTOProject/SSTOProject-1.3.1.ckan
@@ -5,7 +5,8 @@
     "abstract": "SSTO project add wide range of high-performance spacecraft parts",
     "author": "Monniasza",
     "version": "1.3.1",
-    "ksp_version": "1.8.1",
+    "ksp_version_min": "1.8.0",
+    "ksp_version_max": "1.9.1",
     "license": "MIT",
     "resources": {
         "homepage": "https://forum.kerbalspaceprogram.com/index.php?/topic/195058-ssto-project-ksp-181/",
diff --git a/SSTOProject/SSTOProject-1.3.2.ckan b/SSTOProject/SSTOProject-1.3.2.ckan
index a6994510e9..1674f43248 100644
--- a/SSTOProject/SSTOProject-1.3.2.ckan
+++ b/SSTOProject/SSTOProject-1.3.2.ckan
@@ -5,7 +5,8 @@
     "abstract": "SSTO project add wide range of high-performance spacecraft parts",
     "author": "Monniasza",
     "version": "1.3.2",
-    "ksp_version": "1.8.1",
+    "ksp_version_min": "1.8.0",
+    "ksp_version_max": "1.9.1",
     "license": "MIT",
     "resources": {
         "homepage": "https://forum.kerbalspaceprogram.com/index.php?/topic/195058-ssto-project-ksp-181/",
diff --git a/SSTOProject/SSTOProject-1.3.3.ckan b/SSTOProject/SSTOProject-1.3.3.ckan
index a429a07d05..e9a0e1de48 100644
--- a/SSTOProject/SSTOProject-1.3.3.ckan
+++ b/SSTOProject/SSTOProject-1.3.3.ckan
@@ -5,7 +5,8 @@
     "abstract": "SSTO project add wide range of high-performance spacecraft parts",
     "author": "Monniasza",
     "version": "1.3.3",
-    "ksp_version": "1.8.1",
+    "ksp_version_min": "1.8.0",
+    "ksp_version_max": "1.9.1",
     "license": "MIT",
     "resources": {
         "homepage": "https://forum.kerbalspaceprogram.com/index.php?/topic/195058-ssto-project-ksp-181/",
diff --git a/SSTOProject/SSTOProject-1.3.ckan b/SSTOProject/SSTOProject-1.3.ckan
index 4070dc0492..b9c1aa8a0e 100644
--- a/SSTOProject/SSTOProject-1.3.ckan
+++ b/SSTOProject/SSTOProject-1.3.ckan
@@ -5,7 +5,8 @@
     "abstract": "SSTO project add wide range of high-performance spacecraft parts",
     "author": "Monniasza",
     "version": "1.3",
-    "ksp_version": "1.8.1",
+    "ksp_version_min": "1.8.0",
+    "ksp_version_max": "1.9.1",
     "license": "MIT",
     "resources": {
         "homepage": "https://forum.kerbalspaceprogram.com/index.php?/topic/195058-ssto-project-ksp-181/",