diff --git a/Pipfile b/Pipfile
index dd26f6a..fd8737b 100644
--- a/Pipfile
+++ b/Pipfile
@@ -12,7 +12,7 @@ pytest-pythonpath = "==0.7.3"
 
 [packages]
 uritemplate = "==3.0.0"
-pyyaml = "==5.2"
+pyyaml = "==5.4"
 lxml = "==4.6.2"
 requests = "==2.22.0"
 django = "==2.2.28"
diff --git a/Pipfile.lock b/Pipfile.lock
index 539c8fc..00b50b0 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,8 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "cb04616e40f5dffd9260ebcd1aa45979a4c413bf9270256814f5b84f17e1be69"
+            "sha256": "e65837c25b9fa071e82ae06985c90e8723cdec244283f6c329565262409f00cc"
+
         },
         "pipfile-spec": 6,
         "requires": {
@@ -473,20 +474,30 @@
         },
         "pyyaml": {
             "hashes": [
-                "sha256:0e7f69397d53155e55d10ff68fdfb2cf630a35e6daf65cf0bdeaf04f127c09dc",
-                "sha256:2e9f0b7c5914367b0916c3c104a024bb68f269a486b9d04a2e8ac6f6597b7803",
-                "sha256:35ace9b4147848cafac3db142795ee42deebe9d0dad885ce643928e88daebdcc",
-                "sha256:38a4f0d114101c58c0f3a88aeaa44d63efd588845c5a2df5290b73db8f246d15",
-                "sha256:483eb6a33b671408c8529106df3707270bfacb2447bf8ad856a4b4f57f6e3075",
-                "sha256:4b6be5edb9f6bb73680f5bf4ee08ff25416d1400fbd4535fe0069b2994da07cd",
-                "sha256:7f38e35c00e160db592091751d385cd7b3046d6d51f578b29943225178257b31",
-                "sha256:8100c896ecb361794d8bfdb9c11fce618c7cf83d624d73d5ab38aef3bc82d43f",
-                "sha256:c0ee8eca2c582d29c3c2ec6e2c4f703d1b7f1fb10bc72317355a746057e7346c",
-                "sha256:e4c015484ff0ff197564917b4b4246ca03f411b9bd7f16e02a2f586eb48b6d04",
-                "sha256:ebc4ed52dcc93eeebeae5cf5deb2ae4347b3a81c3fa12b0b8c976544829396a4"
+                "sha256:02c78d77281d8f8d07a255e57abdbf43b02257f59f50cc6b636937d68efa5dd0",
+                "sha256:0dc9f2eb2e3c97640928dec63fd8dc1dd91e6b6ed236bd5ac00332b99b5c2ff9",
+                "sha256:124fd7c7bc1e95b1eafc60825f2daf67c73ce7b33f1194731240d24b0d1bf628",
+                "sha256:26fcb33776857f4072601502d93e1a619f166c9c00befb52826e7b774efaa9db",
+                "sha256:31ba07c54ef4a897758563e3a0fcc60077698df10180abe4b8165d9895c00ebf",
+                "sha256:3c49e39ac034fd64fd576d63bb4db53cda89b362768a67f07749d55f128ac18a",
+                "sha256:52bf0930903818e600ae6c2901f748bc4869c0c406056f679ab9614e5d21a166",
+                "sha256:5a3f345acff76cad4aa9cb171ee76c590f37394186325d53d1aa25318b0d4a09",
+                "sha256:5e7ac4e0e79a53451dc2814f6876c2fa6f71452de1498bbe29c0b54b69a986f4",
+                "sha256:7242790ab6c20316b8e7bb545be48d7ed36e26bbe279fd56f2c4a12510e60b4b",
+                "sha256:737bd70e454a284d456aa1fa71a0b429dd527bcbf52c5c33f7c8eee81ac16b89",
+                "sha256:8635d53223b1f561b081ff4adecb828fd484b8efffe542edcfdff471997f7c39",
+                "sha256:8b818b6c5a920cbe4203b5a6b14256f0e5244338244560da89b7b0f1313ea4b6",
+                "sha256:8bf38641b4713d77da19e91f8b5296b832e4db87338d6aeffe422d42f1ca896d",
+                "sha256:a36a48a51e5471513a5aea920cdad84cbd56d70a5057cca3499a637496ea379c",
+                "sha256:b2243dd033fd02c01212ad5c601dafb44fbb293065f430b0d3dbf03f3254d615",
+                "sha256:cc547d3ead3754712223abb7b403f0a184e4c3eae18c9bb7fd15adef1597cc4b",
+                "sha256:cc552b6434b90d9dbed6a4f13339625dc466fd82597119897e9489c953acbc22",
+                "sha256:f3790156c606299ff499ec44db422f66f05a7363b39eb9d5b064f17bd7d7c47b",
+                "sha256:f7a21e3d99aa3095ef0553e7ceba36fb693998fbb1226f1392ce33681047465f",
+                "sha256:fdc6b2cb4b19e431994f25a9160695cc59a4e861710cc6fc97161c5e845fc579"
             ],
             "index": "pypi",
-            "version": "==5.2"
+            "version": "==5.4"
         },
         "requests": {
             "hashes": [
@@ -632,60 +643,59 @@
         },
         "zope.interface": {
             "hashes": [
-                "sha256:08f9636e99a9d5410181ba0729e0408d3d8748026ea938f3b970a0249daa8192",
-                "sha256:0b465ae0962d49c68aa9733ba92a001b2a0933c317780435f00be7ecb959c702",
-                "sha256:0cba8477e300d64a11a9789ed40ee8932b59f9ee05f85276dbb4b59acee5dd09",
-                "sha256:0cee5187b60ed26d56eb2960136288ce91bcf61e2a9405660d271d1f122a69a4",
-                "sha256:0ea1d73b7c9dcbc5080bb8aaffb776f1c68e807767069b9ccdd06f27a161914a",
-                "sha256:0f91b5b948686659a8e28b728ff5e74b1be6bf40cb04704453617e5f1e945ef3",
-                "sha256:15e7d1f7a6ee16572e21e3576d2012b2778cbacf75eb4b7400be37455f5ca8bf",
-                "sha256:17776ecd3a1fdd2b2cd5373e5ef8b307162f581c693575ec62e7c5399d80794c",
-                "sha256:194d0bcb1374ac3e1e023961610dc8f2c78a0f5f634d0c737691e215569e640d",
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-                "sha256:d0c1bc2fa9a7285719e5678584f6b92572a5b639d0e471bb8d4b650a1a910920",
-                "sha256:d4d9d6c1a455d4babd320203b918ccc7fcbefe308615c521062bc2ba1aa4d26e",
-                "sha256:db1fa631737dab9fa0b37f3979d8d2631e348c3b4e8325d6873c2541d0ae5a48",
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-            ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
-            "version": "==5.4.0"
+                "sha256:02d3535aa18e34ce97c58d241120b7554f7d1cf4f8002fc9675cc7e7745d20e8",
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+                "sha256:b4d59ab3608538e550a72cea13d3c209dd72b6e19e832688da7884081c01594e",
+                "sha256:b51d3f1cd87f488455f43046d72003689024b0fa9b2d53635db7523033b19996",
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+                "sha256:c7b6032dc4490b0dcaf078f09f5b382dc35493cb7f473840368bf0de3196c2b6",
+                "sha256:c95b355dba2aaf5177dff943b25ded0529a7feb80021d5fdb114a99f0a1ef508",
+                "sha256:c980ae87863d76b1ea9a073d6d95554b4135032d34bc541be50c07d4a085821b",
+                "sha256:d12895cd083e35e9e032eb4b57645b91116f8979527381a8d864d1f6b8cb4a2e",
+                "sha256:d3cd9bad547a8e5fbe712a1dc1413aff1b917e8d39a2cd1389a6f933b7a21460",
+                "sha256:e8809b01f27f679e3023b9e2013051e0a3f17abff4228cb5197663afd8a0f2c7",
+                "sha256:f3c37b0dc1898e305aad4f7a1d75f6da83036588c28a9ce0afc681ff5245a601",
+                "sha256:f966765f54b536e791541458de84a737a6adba8467190f17a8fe7f85354ba908",
+                "sha256:fa939c2e2468142c9773443d4038e7c915b0cc1b670d3c9192bdc503f7ea73e9",
+                "sha256:fcc5c1f95102989d2e116ffc8467963554ce89f30a65a3ea86a4d06849c498d8"
+            ],
+            "version": "==5.3.0"
         }
     },
     "develop": {