diff --git a/src/boardlib/util/grades.py b/src/boardlib/util/grades.py
index 95354fe..5b02701 100644
--- a/src/boardlib/util/grades.py
+++ b/src/boardlib/util/grades.py
@@ -40,11 +40,11 @@
     "7B+": "V8",
     "7C": "V9",
     "7C+": "V10",
-    "8A": "V9",
-    "8A+": "V10",
-    "8B": "V11",
-    "8B+": "V12",
-    "8C": "V13",
-    "8C+": "V14",
-    "9A": "V15",
+    "8A": "V11",
+    "8A+": "V12",
+    "8B": "V13",
+    "8B+": "V14",
+    "8C": "V15",
+    "8C+": "V16",
+    "9A": "V17",
 }