diff --git a/Chapter07/gamestore/Pipfile.lock b/Chapter07/gamestore/Pipfile.lock
index daf8ee9..462096a 100644
--- a/Chapter07/gamestore/Pipfile.lock
+++ b/Chapter07/gamestore/Pipfile.lock
@@ -3,19 +3,6 @@
         "hash": {
             "sha256": "38bf0e79d02feebcaa764c909adb1426b214f386351a92e47352fdd19807b8c5"
         },
-        "host-environment-markers": {
-            "implementation_name": "cpython",
-            "implementation_version": "3.6.2",
-            "os_name": "posix",
-            "platform_machine": "x86_64",
-            "platform_python_implementation": "CPython",
-            "platform_release": "4.9.0-3-amd64",
-            "platform_system": "Linux",
-            "platform_version": "#1 SMP Debian 4.9.30-2+deb9u2 (2017-06-26)",
-            "python_full_version": "3.6.2",
-            "python_version": "3.6",
-            "sys_platform": "linux"
-        },
         "pipfile-spec": 6,
         "requires": {
             "python_version": "3.6"
@@ -31,15 +18,15 @@
     "default": {
         "certifi": {
             "hashes": [
-                "sha256:14131608ad2fd56836d33a71ee60fa1c82bc9d2c8d98b7bdbc631fe1b3cd1296",
-                "sha256:edbc3f203427eef571f79a7692bb160a2b0f7ccaa31953e99bd17e307cf63f7d"
+                "sha256:2bbf76fd432960138b3ef6dda3dde0544f27cbf8546c458e60baf371917ba9ee",
+                "sha256:50b1e4f8446b06f41be7dd6338db18e0990601dce795c2b1686458aa7e8fa7d8"
             ],
-            "version": "==2018.1.18"
+            "version": "==2021.5.30"
         },
         "chardet": {
             "hashes": [
-                "sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691",
-                "sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae"
+                "sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae",
+                "sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691"
             ],
             "version": "==3.0.4"
         },
@@ -48,94 +35,84 @@
                 "sha256:52475f607c92035d4ac8fee284f56213065a4a6b25ed43f7e39df0e576e69e9f",
                 "sha256:d96b804be412a5125a594023ec524a2010a6ffa4d408e5482ab6ff3cb97ec12f"
             ],
+            "index": "pypi",
             "version": "==2.0.1"
         },
         "idna": {
             "hashes": [
-                "sha256:8c7309c718f94b3a625cb648ace320157ad16ff131ae0af362c9f21b80ef6ec4",
-                "sha256:2c6a5de3089009e3da7c5dde64a141dbc8551d5b7f6cf4ed7c2568d0cc520a8f"
+                "sha256:2c6a5de3089009e3da7c5dde64a141dbc8551d5b7f6cf4ed7c2568d0cc520a8f",
+                "sha256:8c7309c718f94b3a625cb648ace320157ad16ff131ae0af362c9f21b80ef6ec4"
             ],
             "version": "==2.6"
         },
         "jedi": {
             "hashes": [
-                "sha256:d795f2c2e659f5ea39a839e5230d70a0b045d0daee7ca2403568d8f348d0ad89",
-                "sha256:d6e799d04d1ade9459ed0f20de47c32f2285438956a677d083d3c98def59fa97"
+                "sha256:d6e799d04d1ade9459ed0f20de47c32f2285438956a677d083d3c98def59fa97",
+                "sha256:d795f2c2e659f5ea39a839e5230d70a0b045d0daee7ca2403568d8f348d0ad89"
             ],
+            "index": "pypi",
             "version": "==0.11.1"
         },
         "parso": {
             "hashes": [
-                "sha256:a7bb86fe0844304869d1c08e8bd0e52be931228483025c422917411ab82d628a",
-                "sha256:5815f3fe254e5665f3c5d6f54f086c2502035cb631a91341591b5a564203cffb"
+                "sha256:5815f3fe254e5665f3c5d6f54f086c2502035cb631a91341591b5a564203cffb",
+                "sha256:a7bb86fe0844304869d1c08e8bd0e52be931228483025c422917411ab82d628a"
             ],
             "version": "==0.1.1"
         },
         "pillow": {
             "hashes": [
-                "sha256:718ec7a122b28d64afc5fbc3a9b99bb0545ef511373cac06fe7624520e82cb20",
-                "sha256:801cca8923508311bf5d6d0f7da5362552e8208ebd8ec0d7b9f2cd2ff5705734",
-                "sha256:43334f9581cd067945b8898cef9eb5714ee4883f8de0304c011f1dbdb1d4e2aa",
-                "sha256:153ec6f18f7b61641e0e6e502acfaf4a06c9aba2ea11c0b4b3578ea9f13a4a4a",
-                "sha256:25193f934d37d836a6b1f4c062ce574a96cbca7c6d9dc8ddfbbac7f9c54deaa4",
-                "sha256:b85f703c2ffe539313e39ce0676bed0f355cec45a16e58c9ab7417445843047c",
-                "sha256:8580fc58074a16b749905b26cf8363f7b628dd167ba0130f5382cdc91c86b509",
-                "sha256:2fcde9954c8882d1c7f93bb828caa34a4c5e3ee69dbc7895dc8652ad972b455a",
-                "sha256:1a5b93084e01328a1cb1ecdad99d11d75e881e89a95f88d85b523646553b36c2",
-                "sha256:b2240f298482f823576f397bb9f32ea913ad9456c526e141bc6f0a022b37a3e8",
-                "sha256:b1d33c63a55d0d85df0ad02b2c16158fb4d8153afa7b908f1a67330fac694cd6",
-                "sha256:6977cf073d83358b34f93abf5c1f1193b88675fe0e4441e0e28318bc3dcba7a0",
-                "sha256:1912b7230459fd53682dae32b83cbd8e5d642ba36d4be18566f00a9c063aa13d",
-                "sha256:4bd4a71501b6d51db4abc07e1f43f5a6fed0a1a9583cca0b401d6af50284b0db",
-                "sha256:0013f590a8f260df60bcfd65db19d18efc04e7f046c3c82a40e2e2b3292a937c",
-                "sha256:a224651a81e45ef4f1d0164e256c5f6b4abb49f2ae8f22ba2f3a9d0ff338e608",
-                "sha256:c793dfaa130847ccff958492b76ae8b9304e60b8a79a92962cb19e368276a22b",
-                "sha256:0b899ee80920bb533f26581af9b4660bc12aff4562555afe74e429101ebf3c94",
-                "sha256:9525cd680a6f9e80c6c0af03cf973e6505c59f60b4745f682cd1a449e54b31bb",
-                "sha256:35f7d998b8e82fb3fb51ff88b30485eb81cd7dd56ec7e1a8deba23eb88532d44",
-                "sha256:5b0d657460d9f3615876fec6306e97ca15a471f6169b622d76a47e270998acf1",
-                "sha256:ddd16ab250b4fc97db1c47407e78c25216a75c29d29d10ad37e51b7a2ec7b2c3",
-                "sha256:b9f63451084a718eccdeb1e382768c94647915653af4d6019f64560d9e98642b",
-                "sha256:a370d1c570f1d72e877099651e752332444b1c5009381f043c9da5fd47f3ebae",
-                "sha256:dc4b018d5c9b636f7546583c5591b9ea00c328c3e5871992ef5b95bac353f097",
-                "sha256:e126ff4fed71e78333840c07279e1617f63cfca76d63ad5b27d65a7277206a3d",
-                "sha256:fcf64c91fd44485100a2965d23bb0e227d093e91f7e776c5ca3b32574766eb56",
-                "sha256:2c042352b430d678db50c78c5214e19638eff8b688941271da2de21fd298dfe5",
-                "sha256:17fe25efc785194d48c38fad85dce470013ba19d2fb66639e149f14bccf1327f",
-                "sha256:2e818dbe445e86fc6c266973fe540c35125c42eb2cf13a6095e9adaa89c0deb5",
-                "sha256:135e9aa65150c53f7db85bf2bebb8a0e1a48ea850e80cf66e16dd04fa09d309c",
-                "sha256:7dfbefdb3fb911ca9faed307bf309861e9995e36cca6b761c7ba6d9b77a9744a",
-                "sha256:12f29d6c23424f704c66b5b68c02fe0b571504459605cfe36ab8158359b0e1bb",
-                "sha256:f8d49be8c282df8d2e1ab6ab53ab8abd859b1fa6fed384457ee85c9eff64ef97",
-                "sha256:82b172e3264e62372c01b5b009b5b1a02fbb9276cbe5cc57ab00a6d6e5ed9a18",
-                "sha256:57aa6198ba8acba1313c3b743e267d821a60cac77e6026caf0b55ca58d3d23be",
-                "sha256:d60c1625b108432ace8b1fa1a584017e5efa73f107d0f493c7f39c79bebf1d41",
-                "sha256:82d1ff571489765df2816785d532e243bde213752156c227fca595723ec5ff42",
-                "sha256:37cc0339abfa9e295c75d9a7f227d35cb44716feb95057f9449c4a9e9a17daf7",
-                "sha256:931030d1d6282b7900e6b0a7ff9ecdb503b5e1e6781800dab2b71a9f39405bff",
-                "sha256:5cd36804f9f06a914a883fe682df5711d16d7b4f44d43189c5f013e7cd91e149"
-            ],
-            "version": "==5.0.0"
+                "sha256:01425106e4e8cee195a411f729cff2a7d61813b0b11737c12bd5991f5f14bcd5",
+                "sha256:031a6c88c77d08aab84fecc05c3cde8414cd6f8406f4d2b16fed1e97634cc8a4",
+                "sha256:083781abd261bdabf090ad07bb69f8f5599943ddb539d64497ed021b2a67e5a9",
+                "sha256:0d19d70ee7c2ba97631bae1e7d4725cdb2ecf238178096e8c82ee481e189168a",
+                "sha256:0e04d61f0064b545b989126197930807c86bcbd4534d39168f4aa5fda39bb8f9",
+                "sha256:12e5e7471f9b637762453da74e390e56cc43e486a88289995c1f4c1dc0bfe727",
+                "sha256:22fd0f42ad15dfdde6c581347eaa4adb9a6fc4b865f90b23378aa7914895e120",
+                "sha256:238c197fc275b475e87c1453b05b467d2d02c2915fdfdd4af126145ff2e4610c",
+                "sha256:3b570f84a6161cf8865c4e08adf629441f56e32f180f7aa4ccbd2e0a5a02cba2",
+                "sha256:463822e2f0d81459e113372a168f2ff59723e78528f91f0bd25680ac185cf797",
+                "sha256:4d98abdd6b1e3bf1a1cbb14c3895226816e666749ac040c4e2554231068c639b",
+                "sha256:5afe6b237a0b81bd54b53f835a153770802f164c5570bab5e005aad693dab87f",
+                "sha256:5b70110acb39f3aff6b74cf09bb4169b167e2660dabc304c1e25b6555fa781ef",
+                "sha256:5cbf3e3b1014dddc45496e8cf38b9f099c95a326275885199f427825c6522232",
+                "sha256:624b977355cde8b065f6d51b98497d6cd5fbdd4f36405f7a8790e3376125e2bb",
+                "sha256:63728564c1410d99e6d1ae8e3b810fe012bc440952168af0a2877e8ff5ab96b9",
+                "sha256:66cc56579fd91f517290ab02c51e3a80f581aba45fd924fcdee01fa06e635812",
+                "sha256:6c32cc3145928c4305d142ebec682419a6c0a8ce9e33db900027ddca1ec39178",
+                "sha256:8b56553c0345ad6dcb2e9b433ae47d67f95fc23fe28a0bde15a120f25257e291",
+                "sha256:8bb1e155a74e1bfbacd84555ea62fa21c58e0b4e7e6b20e4447b8d07990ac78b",
+                "sha256:95d5ef984eff897850f3a83883363da64aae1000e79cb3c321915468e8c6add5",
+                "sha256:a013cbe25d20c2e0c4e85a9daf438f85121a4d0344ddc76e33fd7e3965d9af4b",
+                "sha256:a787ab10d7bb5494e5f76536ac460741788f1fbce851068d73a87ca7c35fc3e1",
+                "sha256:a7d5e9fad90eff8f6f6106d3b98b553a88b6f976e51fce287192a5d2d5363713",
+                "sha256:aac00e4bc94d1b7813fe882c28990c1bc2f9d0e1aa765a5f2b516e8a6a16a9e4",
+                "sha256:b91c36492a4bbb1ee855b7d16fe51379e5f96b85692dc8210831fbb24c43e484",
+                "sha256:c03c07ed32c5324939b19e36ae5f75c660c81461e312a41aea30acdd46f93a7c",
+                "sha256:c5236606e8570542ed424849f7852a0ff0bce2c4c8d0ba05cc202a5a9c97dee9",
+                "sha256:c6b39294464b03457f9064e98c124e09008b35a62e3189d3513e5148611c9388",
+                "sha256:cb7a09e173903541fa888ba010c345893cd9fc1b5891aaf060f6ca77b6a3722d",
+                "sha256:d68cb92c408261f806b15923834203f024110a2e2872ecb0bd2a110f89d3c602",
+                "sha256:dc38f57d8f20f06dd7c3161c59ca2c86893632623f33a42d592f097b00f720a9",
+                "sha256:e98eca29a05913e82177b3ba3d198b1728e164869c613d76d0de4bde6768a50e",
+                "sha256:f217c3954ce5fd88303fc0c317af55d5e0204106d86dea17eb8205700d47dec2"
+            ],
+            "index": "pypi",
+            "version": "==8.2.0"
         },
         "pytz": {
             "hashes": [
-                "sha256:80af0f3008046b9975242012a985f04c5df1f01eed4ec1633d56cc47a75a6a48",
-                "sha256:feb2365914948b8620347784b6b6da356f31c9d03560259070b2f30cff3d469d",
-                "sha256:59707844a9825589878236ff2f4e0dc9958511b7ffaae94dc615da07d4a68d33",
-                "sha256:d0ef5ef55ed3d37854320d4926b04a4cb42a2e88f71da9ddfdacfde8e364f027",
-                "sha256:c41c62827ce9cafacd6f2f7018e4f83a6f1986e87bfd000b8cfbd4ab5da95f1a",
-                "sha256:8cc90340159b5d7ced6f2ba77694d946fc975b09f1a51d93f3ce3bb399396f94",
-                "sha256:dd2e4ca6ce3785c8dd342d1853dd9052b19290d5bf66060846e5dc6b8d6667f7",
-                "sha256:699d18a2a56f19ee5698ab1123bbcc1d269d061996aeb1eda6d89248d3542b82",
-                "sha256:fae4cffc040921b8a2d60c6cf0b5d662c1190fe54d718271db4eb17d44a185b7"
+                "sha256:83a4a90894bf38e243cf052c8b58f381bfe9a7a483f6a9cab140bc7f702ac4da",
+                "sha256:eb10ce3e7736052ed3623d49975ce333bcd712c7bb19a58b9e2089d4057d0798"
             ],
-            "version": "==2017.3"
+            "version": "==2021.1"
         },
         "requests": {
             "hashes": [
                 "sha256:6a1b267aa90cac58ac3a765d067950e7dbbf75b1da07e895d1f594193a40a38b",
                 "sha256:9c443e7324ba5b85070c4a818ade28bfabedf16ea10206da1132edaa6dda237e"
             ],
+            "index": "pypi",
             "version": "==2.18.4"
         },
         "urllib3": {
@@ -151,26 +128,30 @@
             "hashes": [
                 "sha256:ff787bffb812818c3071784b5ce9a35f8c481a0de7ea0ce4f8b68b8788a12f30"
             ],
+            "index": "pypi",
             "version": "==1.3.3"
         },
         "flake8": {
             "hashes": [
-                "sha256:c7841163e2b576d435799169b78703ad6ac1bbb0f199994fc05f700b2a90ea37",
-                "sha256:7253265f7abd8b313e3892944044a365e3f4ac3fcdcfb4298f55ee9ddf188ba0"
+                "sha256:7253265f7abd8b313e3892944044a365e3f4ac3fcdcfb4298f55ee9ddf188ba0",
+                "sha256:c7841163e2b576d435799169b78703ad6ac1bbb0f199994fc05f700b2a90ea37"
             ],
+            "index": "pypi",
             "version": "==3.5.0"
         },
         "importmagic": {
             "hashes": [
                 "sha256:3f7757a5b74c9a291e20e12023bb3bf71bc2fa3adfb15a08570648ab83eaf8d8"
             ],
+            "index": "pypi",
             "version": "==0.1.7"
         },
         "jedi": {
             "hashes": [
-                "sha256:d795f2c2e659f5ea39a839e5230d70a0b045d0daee7ca2403568d8f348d0ad89",
-                "sha256:d6e799d04d1ade9459ed0f20de47c32f2285438956a677d083d3c98def59fa97"
+                "sha256:d6e799d04d1ade9459ed0f20de47c32f2285438956a677d083d3c98def59fa97",
+                "sha256:d795f2c2e659f5ea39a839e5230d70a0b045d0daee7ca2403568d8f348d0ad89"
             ],
+            "index": "pypi",
             "version": "==0.11.1"
         },
         "mccabe": {
@@ -182,15 +163,15 @@
         },
         "parso": {
             "hashes": [
-                "sha256:a7bb86fe0844304869d1c08e8bd0e52be931228483025c422917411ab82d628a",
-                "sha256:5815f3fe254e5665f3c5d6f54f086c2502035cb631a91341591b5a564203cffb"
+                "sha256:5815f3fe254e5665f3c5d6f54f086c2502035cb631a91341591b5a564203cffb",
+                "sha256:a7bb86fe0844304869d1c08e8bd0e52be931228483025c422917411ab82d628a"
             ],
             "version": "==0.1.1"
         },
         "pycodestyle": {
             "hashes": [
-                "sha256:6c4245ade1edfad79c3446fadfc96b0de2759662dc29d07d80a6f27ad1ca6ba9",
-                "sha256:682256a5b318149ca0d2a9185d365d8864a768a28db66a84a2ea946bcc426766"
+                "sha256:682256a5b318149ca0d2a9185d365d8864a768a28db66a84a2ea946bcc426766",
+                "sha256:6c4245ade1edfad79c3446fadfc96b0de2759662dc29d07d80a6f27ad1ca6ba9"
             ],
             "version": "==2.3.1"
         },
@@ -205,6 +186,7 @@
             "hashes": [
                 "sha256:a09edfd2034fd50099a67822f9bd851fbd0f4e98d3b87519f6267b60e50d80d1"
             ],
+            "index": "pypi",
             "version": "==0.10.7"
         },
         "yapf": {
@@ -212,6 +194,7 @@
                 "sha256:a0bbc8ed274609f9c7575a5d69056fa393e26a778b3e070a72f4998b8e90c3cd",
                 "sha256:bd19f246be7193ad2acdc04702b92315f1ae28d49c82f6671afdeefe9d32f468"
             ],
+            "index": "pypi",
             "version": "==0.20.1"
         }
     }