diff --git a/multi-object-video-tracking-with-opencv/Pipfile.lock b/multi-object-video-tracking-with-opencv/Pipfile.lock
index f21ba74..18b9714 100644
--- a/multi-object-video-tracking-with-opencv/Pipfile.lock
+++ b/multi-object-video-tracking-with-opencv/Pipfile.lock
@@ -40,59 +40,61 @@
         },
         "opencv-python": {
             "hashes": [
-                "sha256:1703a296a96d3d46615e5053f224867977accb4240bcaa0fcabcb0768bf5ac13",
-                "sha256:1777ce7535ee7a1995cae168a107a1320e9df13648b930e72a1a2c2eccd64cda",
-                "sha256:1e5520482fb18fbd64d079e7f17ac0018f195fd75f6360a53bb82d7903106b50",
-                "sha256:25522dcf2529614750a71112a6659759080b4bdc2323f19d47f4d895960fd796",
-                "sha256:2af5f2842ad44c65ae2647377e0ff198719e1a1cfc9c6a19bc0c525c035d4bd8",
-                "sha256:31ec48d7eca13fc25c287dea7cecab453976e372cad8f50d55c054a247efda21",
-                "sha256:47cf48ff5dbd554e9f58cc9e98cf0b5de3f6a971172612bffa06bc5fb79ce872",
-                "sha256:494f98366bb5d6c2ac7e50e6617139f353704fd97a6d12ec9d392e72817d5cb0",
-                "sha256:4a9845870739e640e3350a8d98d511c92c087fe3d66090e83be7bf94e0ac64f7",
-                "sha256:4ac29cc0847d948a6636899014e84e165c30cc8779d6218394d44363462a01ce",
-                "sha256:5857ace03b7854221abf8072462d306c2c2ce4e366190b21d90ee8ee8aaf5bb4",
-                "sha256:5b4a23d99d5a2874767034466f5a8fd37b9f93ac14955a01b1a208983c76b9ad",
-                "sha256:734d87a5021c037064beb62133e135e66c7128e401a63b8b842b809ae2093749",
-                "sha256:78005c1c5d15ef4e32e0f485557bd15b5b6d87f49c19db7fe3e9246a61ebe7e4",
-                "sha256:81ae2283225c5c52fc3d72debd4241c30ccff2bb922578bf7867f9851cce3acb",
-                "sha256:88dbf900f297fdae0f62b899d6a784d8868ec2135854c5f8a9abbad00a6f0c5b",
-                "sha256:8c98ea7b8d327a31cd6028782a06147d0e0329ae8e829e881fb5d02f7ed8aec9",
-                "sha256:937d4686fef6967921145290f5b50c01c00c5b5d3542a6519e8a85cd88448723",
-                "sha256:a057958c0e362b3c4f03b9af1cbdb6d5af035fd22ecd7fd794eba8fdeb049eb8",
-                "sha256:c41eab31fa2c641226c6187caa391a688d064c99f078d604574f1912296b771f",
-                "sha256:cf4f7e62d1f80d1fa85a1693a3500def5cde54b2b75212b3609e552e4c25acfb",
-                "sha256:d90d60143e18334330c149f293071c9f2f3c79c896f33dc4ec65099e58baaaa7",
-                "sha256:db3106b7ca86999a7bd1f2fcc93e49314e5e6e451356774e421a69428df5020b",
-                "sha256:dbaf264db56f4771dfac6624f438bc4dc670aa94f61a6138848fcab7e9e77380",
-                "sha256:e65206c4cf651dc9cf0829962fae8bec986767c9f123d6a1ad17f9356bf7257e",
-                "sha256:eac94ddc78c58e891cff7180274317dad2938a4ddfc6ced1c04846c7f50e77e9",
-                "sha256:f2e828711f044a965509c862b3a59b3181e9c56c145a950cb53d43fec54e66d2"
+                "sha256:0f2e739c582e8c5e432130648bc6d66a56bc65f4cd9ff0bc7033033d2130c7a3",
+                "sha256:0f3d159ad6cb9cbd188c726f87485f0799a067a0a15f34c25d7b5c8db3cb2e50",
+                "sha256:167a6aff9bd124a3a67e0ec25d0da5ecdc8d96a56405e3e5e7d586c4105eb1bb",
+                "sha256:1b90d50bc7a31e9573a8da1b80fcd1e4d9c86c0e5f76387858e1b87eb8b0332b",
+                "sha256:2baf1213ae2fd678991f905d7b2b94eddfdfb5f75757db0f0b31eebd48ca200d",
+                "sha256:312dda54c7e809c20d7409418060ae0e9cdbe82975e7ced429eb3c234ffc0d4a",
+                "sha256:32384e675f7cefe707cac40a95eeb142d6869065e39c5500374116297cd8ca6d",
+                "sha256:5c50634dd8f2f866fd99fd939292ce10e52bef82804ebc4e7f915221c3b7e951",
+                "sha256:6841bb9cc24751dbdf94e7eefc4e6d70ec297952501954471299fd12ab67391c",
+                "sha256:68c1c846dd267cd7e293d3fc0bb238db0a744aa1f2e721e327598f00cb982098",
+                "sha256:703910aaa1dcd25a412f78a190fb7a352d9a64ee7d9a35566d786f3cc66ebf20",
+                "sha256:8002959146ed21959e3118c60c8e94ceac02eea15b691da6c62cff4787c63f7f",
+                "sha256:889eef049d38488b5b4646c48a831feed37c0fd44f3d83c05cff80f4baded145",
+                "sha256:8c76983c9ec3e4cf3a4c1d172ec4285332d9fb1c7194d724aff0c518437471ee",
+                "sha256:9cd9bd72f4a9743ef6f11f0f96784bd215a542e996db1717d4c2d3d03eb81a1b",
+                "sha256:a1a5517301dc8d56243a14253d231ec755b94486b4fff2ae68269bc941bb1f2e",
+                "sha256:a2b08aec2eacae868723136383d9eb84a33062a7a7ec5ec3bd2c423bd1355946",
+                "sha256:a8529a79233f3581a66984acd16bce52ab0163f6f77568dd69e9ee4956d2e1db",
+                "sha256:afbc81a3870739610a9f9a1197374d6a45892cf1933c90fc5617d39790991ed3",
+                "sha256:baeb5dd8b21c718580687f5b4efd03f8139b1c56239cdf6b9805c6946e80f268",
+                "sha256:db1d49b753e6e6c76585f21d09c7e9812176732baa9bddb64bc2fc6cd24d4179",
+                "sha256:e242ed419aeb2488e0f9ee6410a34917f0f8d62b3ae96aa3170d83bae75004e2",
+                "sha256:e36a8857be2c849e54009f1bee25e8c34fbc683fcd38c6c700af4cba5f8d57c2",
+                "sha256:e699232fd033ef0053efec2cba0a7505514f374ba7b18c732a77cb5304311ef9",
+                "sha256:eae3da9231d87980f8082d181c276a04f7a6fdac130cebd467390b96dd05f944",
+                "sha256:ee6814c94dbf1cae569302afef9dd29efafc52373e8770ded0db549a3b6e0c00",
+                "sha256:f01a87a015227d8af407161eb48222fc3c8b01661cdc841e2b86eee4f1a7a417"
             ],
             "index": "pypi",
-            "version": "==4.1.0.25"
+            "version": "==4.2.0.32"
         }
     },
     "develop": {
         "appdirs": {
             "hashes": [
-                "sha256:9e5896d1372858f8dd3344faf4e5014d21849c756c8d5701f78f8a103b372d92",
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             ],
-            "version": "==1.4.3"
+            "version": "==1.4.4"
         },
         "astroid": {
             "hashes": [
-                "sha256:6560e1e1749f68c64a4b5dee4e091fce798d2f0d84ebe638cf0e0585a343acf4",
-                "sha256:b65db1bbaac9f9f4d190199bb8680af6f6f84fd3769a5ea883df8a91fe68b4c4"
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+                "sha256:9eaeaf92b3e21b70bec1a262e7eb118d2e96294892a5de595c92a12adc80dfc2"
             ],
-            "version": "==2.2.5"
+            "markers": "python_version ~= '3.6'",
+            "version": "==2.8.2"
         },
         "attrs": {
             "hashes": [
-                "sha256:69c0dbf2ed392de1cb5ec704444b08a5ef81680a61cb899dc08127123af36a79",
-                "sha256:f0b870f674851ecbfbbbd364d6b5cbdff9dcedbc7f3f5e18a6891057f21fe399"
+                "sha256:149e90d6d8ac20db7a955ad60cf0e6881a3f20d37096140088356da6c716b0b1",
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             ],
-            "version": "==19.1.0"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
+            "version": "==21.2.0"
         },
         "black": {
             "hashes": [
@@ -104,40 +106,55 @@
         },
         "click": {
             "hashes": [
-                "sha256:2335065e6395b9e67ca716de5f7526736bfa6ceead690adf616d925bdc622b13",
-                "sha256:5b94b49521f6456670fdb30cd82a4eca9412788a93fa6dd6df72c94d5a8ff2d7"
+                "sha256:353f466495adaeb40b6b5f592f9f91cb22372351c84caeb068132442a4518ef3",
+                "sha256:410e932b050f5eed773c4cda94de75971c89cdb3155a72a0831139a79e5ecb5b"
+            ],
+            "markers": "python_version >= '3.6'",
+            "version": "==8.0.3"
+        },
+        "importlib-metadata": {
+            "hashes": [
+                "sha256:b618b6d2d5ffa2f16add5697cf57a46c76a56229b0ed1c438322e4e95645bd15",
+                "sha256:f284b3e11256ad1e5d03ab86bb2ccd6f5339688ff17a4d797a0fe7df326f23b1"
             ],
-            "version": "==7.0"
+            "markers": "python_version < '3.8'",
+            "version": "==4.8.1"
         },
         "isort": {
             "hashes": [
                 "sha256:54da7e92468955c4fceacd0c86bd0ec997b0e1ee80d97f67c35a78b719dccab1",
                 "sha256:6e811fcb295968434526407adb8796944f1988c5b65e8139058f2014cbe100fd"
             ],
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
             "version": "==4.3.21"
         },
         "lazy-object-proxy": {
             "hashes": [
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+                "sha256:ed361bb83436f117f9917d282a456f9e5009ea12fd6de8742d1a4752c3017e93",
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+            "version": "==1.6.0"
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         "mccabe": {
             "hashes": [
@@ -154,47 +171,72 @@
             "index": "pypi",
             "version": "==2.3.1"
         },
-        "six": {
+        "toml": {
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+            "version": "==0.10.2"
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+                "sha256:cae53c389825d3b46fb37538441f75d6aecc4174f615d048321b716df2757fb0",
+                "sha256:dd4a21253f42b8d2b48410cb31fe501d32f8b9fbeb1f55063ad102fe9c425e40",
+                "sha256:dde816ca9dac1d9c01dd504ea5967821606f02e510438120091b84e852367428",
+                "sha256:f2362f3cb0f3172c42938946dbc5b7843c2a28aec307c49100c8b38764eb6927",
+                "sha256:f328adcfebed9f11301eaedfa48e15bdece9b519fb27e6a8c01aa52a17ec31b3",
+                "sha256:f8afcf15cc511ada719a88e013cec87c11aff7b91f019295eb4530f96fe5ef2f",
+                "sha256:fb1bbeac803adea29cedd70781399c99138358c26d05fcbd23c13016b7f5ec65"
             ],
-            "version": "==0.10.0"
+            "markers": "python_version < '3.8' and implementation_name == 'cpython'",
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         },
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     }
 }