diff --git a/exercises/isbn-verifier/canonical-data.json b/exercises/isbn-verifier/canonical-data.json
index 7837fccd76..b8452102af 100644
--- a/exercises/isbn-verifier/canonical-data.json
+++ b/exercises/isbn-verifier/canonical-data.json
@@ -1,6 +1,6 @@
 {
     "exercise": "isbn-verifier",
-    "version": "2.3.0",
+    "version": "2.4.0",
     "comments": [
         "An expected value of true indicates a valid ISBN-10, ",
         "whereas false means the ISBN-10 is invalid."
@@ -117,6 +117,14 @@
               "isbn": ""
             },
             "expected": false
+        },
+        {
+            "description": "input is 9 characters",
+            "property": "isValid",
+            "input": {
+                "isbn": "134456729"
+            },
+            "expected": false
         }
     ]
 }