diff --git a/exercises/dominoes/canonical-data.json b/exercises/dominoes/canonical-data.json
index af1caa1f6e..6943084a68 100644
--- a/exercises/dominoes/canonical-data.json
+++ b/exercises/dominoes/canonical-data.json
@@ -1,6 +1,6 @@
 {
   "exercise": "dominoes",
-  "version": "2.0.0",
+  "version": "2.1.0",
   "comments": [
     "Inputs are given as lists of two-element lists.",
     "Feel free to convert the input to a sensible type in the specific language",
@@ -40,37 +40,49 @@
     {
       "description": "empty input = empty output",
       "property": "canChain",
-      "input": [],
+      "input": { 
+        "dominoes": []
+      },
       "expected": true
     },
     {
       "description": "singleton input = singleton output",
       "property": "canChain",
-      "input": [[1, 1]],
+      "input": { 
+        "dominoes": [[1, 1]]
+      },
       "expected": true
     },
     {
       "description": "singleton that can't be chained",
       "property": "canChain",
-      "input": [[1, 2]],
+      "input": { 
+        "dominoes": [[1, 2]]
+      },
       "expected": false
     },
     {
       "description": "three elements",
       "property": "canChain",
-      "input": [[1, 2], [3, 1], [2, 3]],
+      "input": { 
+        "dominoes": [[1, 2], [3, 1], [2, 3]]
+      },
       "expected": true
     },
     {
       "description": "can reverse dominoes",
       "property": "canChain",
-      "input": [[1, 2], [1, 3], [2, 3]],
+      "input": { 
+        "dominoes": [[1, 2], [1, 3], [2, 3]]
+      },
       "expected": true
     },
     {
       "description": "can't be chained",
       "property": "canChain",
-      "input": [[1, 2], [4, 1], [2, 3]],
+      "input": { 
+        "dominoes": [[1, 2], [4, 1], [2, 3]]
+      },
       "expected": false
     },
     {
@@ -83,19 +95,25 @@
         "as that is not a sufficient condition."
       ],
       "property": "canChain",
-      "input": [[1, 1], [2, 2]],
+      "input": { 
+        "dominoes": [[1, 1], [2, 2]]
+      },
       "expected": false
     },
     {
       "description": "disconnected - double loop",
       "property": "canChain",
-      "input": [[1, 2], [2, 1], [3, 4], [4, 3]],
+      "input": { 
+        "dominoes": [[1, 2], [2, 1], [3, 4], [4, 3]]
+      },
       "expected": false
     },
     {
       "description": "disconnected - single isolated",
       "property": "canChain",
-      "input": [[1, 2], [2, 3], [3, 1], [4, 4]],
+      "input": { 
+        "dominoes": [[1, 2], [2, 3], [3, 1], [4, 4]]
+      },
       "expected": false
     },
     {
@@ -108,19 +126,25 @@
         "You need to place the (2, 4) after the (1, 2) rather than the (2, 3)."
       ],
       "property": "canChain",
-      "input": [[1, 2], [2, 3], [3, 1], [2, 4], [2, 4]],
+      "input": {
+        "dominoes": [[1, 2], [2, 3], [3, 1], [2, 4], [2, 4]]
+      },
       "expected": true
     },
     {
       "description": "separate loops",
       "property": "canChain",
-      "input": [[1, 2], [2, 3], [3, 1], [1, 1], [2, 2], [3, 3]],
+      "input": {
+        "dominoes": [[1, 2], [2, 3], [3, 1], [1, 1], [2, 2], [3, 3]]
+      },
       "expected": true
     },
     {
       "description": "nine elements",
       "property": "canChain",
-      "input": [[1, 2], [5, 3], [3, 1], [1, 2], [2, 4], [1, 6], [2, 3], [3, 4], [5, 6]],
+      "input": {
+        "dominoes": [[1, 2], [5, 3], [3, 1], [1, 2], [2, 4], [1, 6], [2, 3], [3, 4], [5, 6]]
+      },
       "expected": true
     }
   ]