Used pipenv install --pre to get the security fixed pyyaml..

docker_api/Pipfile

@@ -9,3 +9,6 @@ fasteners = "*"
 exec-helpers = "*"
 uuid = "*"
 pyyaml = ">=4.2b1"
+
+[pipenv]
+allow_prereleases = true

docker_api/Pipfile.lock

@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "47b17ef1378669a1db772fe19f66b5ff647593c52ced2457799d302fba0b669c"
+            "sha256": "3ea34924aef6998f3a17043fc744f2f8c7de9c908e03056a142d33066b054348"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -292,19 +292,14 @@
         },
         "pyyaml": {
             "hashes": [
-                "sha256:3d7da3009c0f3e783b2c873687652d83b1bbfd5c88e9813fb7e5b03c0dd3108b",
-                "sha256:3ef3092145e9b70e3ddd2c7ad59bdd0252a94dfe3949721633e41344de00a6bf",
-                "sha256:40c71b8e076d0550b2e6380bada1f1cd1017b882f7e16f09a65be98e017f211a",
-                "sha256:558dd60b890ba8fd982e05941927a3911dc409a63dcb8b634feaa0cda69330d3",
-                "sha256:a7c28b45d9f99102fa092bb213aa12e0aaf9a6a1f5e395d36166639c1f96c3a1",
-                "sha256:aa7dd4a6a427aed7df6fb7f08a580d68d9b118d90310374716ae90b710280af1",
-                "sha256:bc558586e6045763782014934bfaf39d48b8ae85a2713117d16c39864085c613",
-                "sha256:d46d7982b62e0729ad0175a9bc7e10a566fc07b224d2c79fafb5e032727eaa04",
-                "sha256:d5eef459e30b09f5a098b9cea68bebfeb268697f78d647bd255a085371ac7f3f",
-                "sha256:e01d3203230e1786cd91ccfdc8f8454c8069c91bee3962ad93b87a4b2860f537",
-                "sha256:e170a9e6fcfd19021dd29845af83bb79236068bf5fd4df3327c1be18182b2531"
+                "sha256:254bf6fda2b7c651837acb2c718e213df29d531eebf00edb54743d10bcb694eb",
+                "sha256:3108529b78577327d15eec243f0ff348a0640b0c3478d67ad7f5648f93bac3e2",
+                "sha256:3c17fb92c8ba2f525e4b5f7941d850e7a48c3a59b32d331e2502a3cdc6648e76",
+                "sha256:8d6d96001aa7f0a6a4a95e8143225b5d06e41b1131044913fecb8f85a125714b",
+                "sha256:c8a88edd93ee29ede719080b2be6cb2333dfee1dccba213b422a9c8e97f2967b"
             ],
-            "version": "==3.13"
+            "index": "pypi",
+            "version": "==4.2b4"
         },
         "six": {
             "hashes": [
@@ -315,10 +310,10 @@
         },
         "tenacity": {
             "hashes": [
-                "sha256:4c10be4f8fbeb1cae24b9315103d8aca3f2b1ef001d455cbb1671d3d79924be6",
-                "sha256:9db46cea3ea23e294932ccc3cdccf1c2177dbb4100b0ff975d653b961e52af8a"
+                "sha256:4652f59aff4d8939b8efc3deb7ea767abb92fefd04314fb495a77deca123ae98",
+                "sha256:8a02779db5db3a90d1b7e405c0a76568f0e004e51776a62c4e60fd3bde74e536"
             ],
-            "version": "==5.0.2"
+            "version": "==5.0.3.dev12"
         },
         "threaded": {
             "hashes": [