diff --git a/tests/fixtures/migration/new_cassette.json b/tests/fixtures/migration/new_cassette.json
index b0e5dab..166c4fc 100644
--- a/tests/fixtures/migration/new_cassette.json
+++ b/tests/fixtures/migration/new_cassette.json
@@ -1,15 +1,15 @@
 [
     {
         "request": {
-            "body": null, 
-            "method": "GET", 
+            "body": null,
             "headers": {
-                "Accept-Encoding": "gzip, deflate, compress", 
-                "Accept": "*/*", 
-                "User-Agent": "python-requests/2.2.1 CPython/2.6.1 Darwin/10.8.0"
-            }, 
-            "uri" : "http://httpbin.org:80/ip"
-        }, 
+                "Accept": ["*/*"],
+                "Accept-Encoding": ["gzip, deflate, compress"],
+                "User-Agent": ["python-requests/2.2.1 CPython/2.6.1 Darwin/10.8.0"]
+            },
+            "method": "GET",
+            "uri": "http://httpbin.org:80/ip"
+        },
         "response": {
             "status": {
                 "message": "OK", 
diff --git a/tests/fixtures/migration/new_cassette.yaml b/tests/fixtures/migration/new_cassette.yaml
index 649da68..2adcbe4 100644
--- a/tests/fixtures/migration/new_cassette.yaml
+++ b/tests/fixtures/migration/new_cassette.yaml
@@ -1,7 +1,9 @@
 - request:
     body: null
-    headers: {Accept: '*/*', Accept-Encoding: 'gzip, deflate, compress', User-Agent: python-requests/2.2.1
-        CPython/2.6.1 Darwin/10.8.0}
+    headers: 
+      Accept: ['*/*']
+      Accept-Encoding: ['gzip, deflate, compress']
+      User-Agent: ['python-requests/2.2.1 CPython/2.6.1 Darwin/10.8.0']
     method: GET
     uri: http://httpbin.org:80/ip
   response: