using python 3.6 (as requirement as well on production)

Pipfile

@@ -43,4 +43,4 @@ flask-restx = "*"
 [dev-packages]
 
 [requires]
-python_version = "3.8"
+python_version = "3.6"

Pipfile.lock

@@ -1,11 +1,11 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "a58778e12f8a5bcff82fd344f97bf22ed1917412e66289d13be718fd88cfc64a"
+            "sha256": "ed9faf5db1ecd9f6524b4e3903b2d2e3cfedff03a928c6921dd799bb1e4ed90b"
         },
         "pipfile-spec": 6,
         "requires": {
-            "python_version": "3.8"
+            "python_version": "3.6"
         },
         "sources": [
             {
@@ -18,9 +18,9 @@
     "default": {
         "alembic": {
             "hashes": [
-                "sha256:2df2519a5b002f881517693b95626905a39c5faf4b5a1f94de4f1441095d1d26"
+                "sha256:791a5686953c4b366d3228c5377196db2f534475bb38d26f70eb69668efd9028"
             ],
-            "version": "==1.4.0"
+            "version": "==1.4.1"
         },
         "aniso8601": {
             "hashes": [
@@ -115,10 +115,10 @@
         },
         "click": {
             "hashes": [
-                "sha256:2335065e6395b9e67ca716de5f7526736bfa6ceead690adf616d925bdc622b13",
+                "sha256:8a18b4ea89d8820c5d0c7da8a64b2c324b4dabb695804dbfea19b9be9d88c0cc",
-                "sha256:5b94b49521f6456670fdb30cd82a4eca9412788a93fa6dd6df72c94d5a8ff2d7"
+                "sha256:e345d143d80bf5ee7534056164e5e112ea5e22716bbb1ce727941f4c8b471b9a"
             ],
-            "version": "==7.0"
+            "version": "==7.1.1"
         },
         "coloredlogs": {
             "hashes": [
@@ -193,10 +193,10 @@
         },
         "decorator": {
             "hashes": [
-                "sha256:54c38050039232e1db4ad7375cfce6748d7b41c29e95a081c8a6d2c30364a2ce",
+                "sha256:41fa54c2a0cc4ba648be4fd43cff00aedf5b9465c9bf18d64325bc225f08f760",
-                "sha256:5d19b92a3c8f7f101c8dd86afd86b0f061a8ce4540ab8cd401fa2542756bce6d"
+                "sha256:e3a62f0520172440ca0dcc823749319382e377f37f140a0b99ef45fecb84bfe7"
             ],
-            "version": "==4.4.1"
+            "version": "==4.4.2"
         },
         "defusedxml": {
             "hashes": [
@@ -322,10 +322,10 @@
         },
         "flask-testing": {
             "hashes": [
-                "sha256:dc076623d7d850653a018cb64f500948334c8aeb6b10a5a842bf1bcfb98122bc"
+                "sha256:d849bf53eb1ceb09dff6611888588cb60f20238058fb1ebcd917d69febc373e6"
             ],
             "index": "pypi",
-            "version": "==0.7.1"
+            "version": "==0.8.0"
         },
         "future": {
             "hashes": [
@@ -370,17 +370,17 @@
         },
         "humanfriendly": {
             "hashes": [
-                "sha256:5e5c2b82fb58dcea413b48ab2a7381baa5e246d47fe94241d7d83724c11c0565",
+                "sha256:25c2108a45cfd1e8fbe9cdb30b825d34ef5d5675c8e11e4775c9aedbfb0bdee2",
-                "sha256:a9a41074c24dc5d6486e8784dc8f057fec8b963217e941c25fb7c7c383a4a1c1"
+                "sha256:3a831920e40e55ad49adb64c9179ed50c604cabca72cd300e7bd5b51310e4ebb"
             ],
-            "version": "==7.1.1"
+            "version": "==8.1"
         },
         "ics": {
             "hashes": [
-                "sha256:12cf34aed0dafa1bf99d79ca58e99949d6721511b856386e118015fe5f5d6e3a"
+                "sha256:bf5fbdef6e1e073afdadf1b996f0271186dd114a148e38e795919a1ae644d6ac"
             ],
             "index": "pypi",
-            "version": "==0.6"
+            "version": "==0.7"
         },
         "idna": {
             "hashes": [
@@ -389,12 +389,20 @@
             ],
             "version": "==2.9"
         },
+        "importlib-metadata": {
+            "hashes": [
+                "sha256:06f5b3a99029c7134207dd882428a66992a9de2bef7c2b699b5641f9886c3302",
+                "sha256:b97607a1a18a5100839aec1dc26a1ea17ee0d93b20b0f008d80a5a050afb200b"
+            ],
+            "markers": "python_version < '3.8'",
+            "version": "==1.5.0"
+        },
         "importlib-resources": {
             "hashes": [
-                "sha256:6e2783b2538bd5a14678284a3962b0660c715e5a0f10243fd5e00a4b5974f50b",
+                "sha256:1dff36d42d94bd523eeb847c25c7dd327cb56686d74a26dfcc8d67c504922d59",
-                "sha256:d3279fd0f6f847cced9f7acc19bd3e5df54d34f93a2e7bb5f238f81545787078"
+                "sha256:7f0e1b2b5f3981e39c52da0f99b2955353c5a139c314994d1126c2551ace9bdf"
             ],
-            "version": "==1.0.2"
+            "version": "==1.3.1"
         },
         "itsdangerous": {
             "hashes": [
@@ -419,9 +427,10 @@
         },
         "mako": {
             "hashes": [
-                "sha256:2984a6733e1d472796ceef37ad48c26f4a984bb18119bb2dbc37a44d8f6e75a4"
+                "sha256:3139c5d64aa5d175dbafb95027057128b5fbd05a40c53999f3905ceb53366d9d",
+                "sha256:8e8b53c71c7e59f3de716b6832c4e401d903af574f6962edbbbf6ecc2a5fe6c9"
             ],
-            "version": "==1.1.1"
+            "version": "==1.1.2"
         },
         "markupsafe": {
             "hashes": [
@@ -527,9 +536,10 @@
         },
         "pycparser": {
             "hashes": [
-                "sha256:a988718abfad80b6b157acce7bf130a30876d27603738ac39f140993246b25b3"
+                "sha256:2d475327684562c3a96cc71adf7dc8c4f0565175cf86b6d7a404ff4c771f15f0",
+                "sha256:7582ad22678f0fcd81102833f60ef8d0e57288b6b5fb00323d101be910e35705"
             ],
-            "version": "==2.19"
+            "version": "==2.20"
         },
         "pycryptodomex": {
             "hashes": [
@@ -588,13 +598,6 @@
             "index": "pypi",
             "version": "==1.7.1"
         },
-        "pyreadline": {
-            "hashes": [
-                "sha256:4530592fc2e85b25b1a9f79664433da09237c1a270e4d78ea5aa3a2c7229e2d1"
-            ],
-            "markers": "sys_platform == 'win32'",
-            "version": "==2.1"
-        },
         "pyrsistent": {
             "hashes": [
                 "sha256:cdc7b5e3ed77bed61270a47d35434a30617b9becdf2478af76ad2c6ade307280"
@@ -713,10 +716,10 @@
         },
         "sqlalchemy": {
             "hashes": [
-                "sha256:64a7b71846db6423807e96820993fa12a03b89127d278290ca25c0b11ed7b4fb"
+                "sha256:c4cca4aed606297afbe90d4306b49ad3a4cd36feb3f87e4bfd655c57fd9ef445"
             ],
             "index": "pypi",
-            "version": "==1.3.13"
+            "version": "==1.3.15"
         },
         "sqlalchemy-migrate": {
             "hashes": [
@@ -728,10 +731,10 @@
         },
         "sqlparse": {
             "hashes": [
-                "sha256:40afe6b8d4b1117e7dff5504d7a8ce07d9a1b15aeeade8a2d10f130a834f8177",
+                "sha256:022fb9c87b524d1f7862b3037e541f68597a730a8843245c349fc93e1643dc4e",
-                "sha256:7c3dca29c022744e95b547e867cee89f4fce4373f3549ccd8797d8eb52cdb873"
+                "sha256:e162203737712307dfe78860cc56c8da8a852ab2ee33750e33aeadf38d12c548"
             ],
-            "version": "==0.3.0"
+            "version": "==0.3.1"
         },
         "ssh2-python": {
             "hashes": [
@@ -768,10 +771,10 @@
         },
         "tatsu": {
             "hashes": [
-                "sha256:0adbf7189a8c4f9a882b442f7b8ed6c6ab3baae37057db0e96b6888daacffad0",
+                "sha256:80713413473a009f2081148d0f494884cabaf9d6866b71f2a68a92b6442f343d",
-                "sha256:3a043490e577632a05374b5033646bbc26cbb17386df81735a569ecbd45d934b"
+                "sha256:c9211eeee9a2d4c90f69879ec0b518b1aa0d9450249cb0dd181f5f5b18be0a92"
             ],
-            "version": "==5.5.0"
+            "version": "==4.4.0"
         },
         "tempita": {
             "hashes": [
@@ -829,6 +832,14 @@
                 "sha256:b353856d37dec59d6511359f97f6a4b2468442e454bd1c98298ddce53cac1f04"
             ],
             "version": "==0.16.1"
+        },
+        "zipp": {
+            "hashes": [
+                "sha256:aa36550ff0c0b7ef7fa639055d797116ee891440eac1a56f378e2d3179e0320b",
+                "sha256:c599e4d75c98f6798c509911d08a22e6c021d074469042177c8c86fb92eefd96"
+            ],
+            "markers": "python_version < '3.8'",
+            "version": "==3.1.0"
         }
     },
     "develop": {}