diff --git a/exercises/hamming/canonical-data.json b/exercises/hamming/canonical-data.json
index 3e78807457..b783741013 100644
--- a/exercises/hamming/canonical-data.json
+++ b/exercises/hamming/canonical-data.json
@@ -1,6 +1,6 @@
 {
 "exercise": "hamming",
-"version": "2.3.0",
+"version": "2.4.0",
   "comments": [
     "Language implementations vary on the issue of unequal length strands.",
     "A language may elect to simplify this task by only presenting equal",
@@ -73,24 +73,6 @@
         "strand2": "AGTG"
       },
       "expected": {"error": "left and right strands must be of equal length"}
-    },
-    {
-      "description": "disallow left empty strand",
-      "property": "distance",
-      "input": {
-        "strand1": "",
-        "strand2": "G"
-      },
-      "expected": {"error": "left strand must not be empty"}
-    },
-    {
-      "description": "disallow right empty strand",
-      "property": "distance",
-      "input": {
-        "strand1": "G",
-        "strand2": ""
-      },
-      "expected": {"error": "right strand must not be empty"}
     }
   ]
 }