diff --git a/Chapter04/Pipfile.lock b/Chapter04/Pipfile.lock
index 5e4a846..b259c4b 100644
--- a/Chapter04/Pipfile.lock
+++ b/Chapter04/Pipfile.lock
@@ -3,19 +3,6 @@
         "hash": {
             "sha256": "ad6b830d67e5a93bbea6986b16082815424a5f10549ab0fda87dea6f8939cdd0"
         },
-        "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"
@@ -31,74 +18,76 @@
     "default": {
         "certifi": {
             "hashes": [
-                "sha256:14131608ad2fd56836d33a71ee60fa1c82bc9d2c8d98b7bdbc631fe1b3cd1296",
-                "sha256:edbc3f203427eef571f79a7692bb160a2b0f7ccaa31953e99bd17e307cf63f7d"
+                "sha256:35824b4c3a97115964b408844d64aa14db1cc518f6562e8d7261699d1350a9e3",
+                "sha256:4ad3232f5e926d6718ec31cfc1fcadfde020920e278684144551c91769c7bc18"
             ],
-            "version": "==2018.1.18"
+            "index": "pypi",
+            "version": "==2022.12.7"
         },
         "chardet": {
             "hashes": [
-                "sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691",
-                "sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae"
+                "sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae",
+                "sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691"
             ],
             "version": "==3.0.4"
         },
         "idna": {
             "hashes": [
-                "sha256:8c7309c718f94b3a625cb648ace320157ad16ff131ae0af362c9f21b80ef6ec4",
-                "sha256:2c6a5de3089009e3da7c5dde64a141dbc8551d5b7f6cf4ed7c2568d0cc520a8f"
+                "sha256:2c6a5de3089009e3da7c5dde64a141dbc8551d5b7f6cf4ed7c2568d0cc520a8f",
+                "sha256:8c7309c718f94b3a625cb648ace320157ad16ff131ae0af362c9f21b80ef6ec4"
             ],
             "version": "==2.6"
         },
         "pymongo": {
             "hashes": [
+                "sha256:01dd4d25dc0fad15db3b384d04ac6cc1f75b56b48afd0a85a8d8207b44b741bb",
+                "sha256:02180988dc858739a856e9f77276298c6015e6fa9e87a6ad6362f679b2e5c2bb",
+                "sha256:18fa5c2ebb23c8f34f30a5c764ada19621a4523f83aeeb8df9fc19ecfe76f838",
+                "sha256:1ee151105631724db9616dd2e083d7c28141c3fedc3d71c12bace5466621f785",
+                "sha256:1f865cb1999dce298746c84608ba8f2401e186691f6560a3401d812b3fdba74f",
+                "sha256:20769fd9bc0837e7334ad2c6c06953024b415dbed09fd59d6a61feeb29a6fe30",
+                "sha256:2dd5b261b00adffce993dc5ffd0feb94368e1657eb16edeed62ae8fe142ac34e",
+                "sha256:3ab86827cfc1283300cd050bad185840b150877ad5b324053f7a9455ee6e596f",
+                "sha256:3b49f5979e1c4603b19b3805032a1a5abaecbc0f54dc765ba1b663e765711baf",
+                "sha256:3cd107632808d1b94da6591f3bf2579ba88333650a6537b7655882487a8caac4",
+                "sha256:4568c460343f724e8944078ab165fa54d9e33fdb1867f1e3d1e231f8ca4368a6",
+                "sha256:456b96c606147cea58f9316092b1ac8a239e891a1e8644a932e8a3c9cafec155",
+                "sha256:480addc4e9b87877d0508d64a5f2489448358537e94476f6341538981aef6e8f",
+                "sha256:4a69850e3d5d19e3b97918de5a19f1dacd1c08a0fe8df55221fe47a2ea767931",
                 "sha256:54e5a5e70ca8afe38f517746ace4d20f5d814de16d5734299a18a664feb47a3f",
-                "sha256:59cf6f39042acd8062cc5c685838fb1532bb6424992ac757ceec742452d5a1bc",
-                "sha256:f21caa2aae45ebfc420bc2631acf2c8de0e8384b14565c415c2fae9dc7aacdf9",
-                "sha256:8c235432ddc354382ef9cce1e852d3c55ade84f661bcb617f2d095476d2927c4",
-                "sha256:82498737ef6c1ed6982b819eeac7fc241a581e7ac0eb73bea21bd4888e6e0530",
-                "sha256:914ae20e5f3574135ae270d69bd7e8cfdaacbfc561c47e587dee0dcbada3a3a2",
                 "sha256:595b2b780e5b17e95eac1c5a8935a673742186849cd73bde6706b76b7de8d1ef",
-                "sha256:db739c3323e4b5abd4778a2b3c73b7582c5ceadb40612e0dcc20fbc1abb538a3",
+                "sha256:59cf6f39042acd8062cc5c685838fb1532bb6424992ac757ceec742452d5a1bc",
+                "sha256:634dc6e204f2dedfae18a095790e3baba6b071dbe0660b2b3af0f21ea0215cd4",
+                "sha256:63d64859599b3ddc85ae7a211051e12ed956ce1deeaddc2c620fa323b6dfa97f",
+                "sha256:66afa84a953e0e59d1f60bb05f25202759b9a606c748ee410b96763152cfd11a",
                 "sha256:6de8a60ce357b36bfee923abcea29ede2906fa88cdc426d078e8fbb9b00efaa8",
-                "sha256:480addc4e9b87877d0508d64a5f2489448358537e94476f6341538981aef6e8f",
-                "sha256:d8a81a7d611936931145fa759cfacf99ff755d16e2d336677af439e128613da1",
+                "sha256:6e53318801aed1abf4a41d94c4cea2b89749b706ed9a79599d69df5b70ffc175",
+                "sha256:6fae8c918c9f66ccfa15a7bc3b92fb9e095302f8bb7789ee59eb05b7d8c618fa",
+                "sha256:7a5fc9aead0fd4946607279ef34f379e312716abfae53e6fa6603ae3eec4308a",
+                "sha256:82498737ef6c1ed6982b819eeac7fc241a581e7ac0eb73bea21bd4888e6e0530",
+                "sha256:8c235432ddc354382ef9cce1e852d3c55ade84f661bcb617f2d095476d2927c4",
                 "sha256:8c360dba39dce961d1e3b5af048612d17575f62abf889b9ddd74ab52d9026ed9",
-                "sha256:dd93e47651d7a7a63c32d0c8f5d6e6c50d99b7a0f2ef08a4237727d89dac8f4e",
-                "sha256:1ee151105631724db9616dd2e083d7c28141c3fedc3d71c12bace5466621f785",
-                "sha256:66afa84a953e0e59d1f60bb05f25202759b9a606c748ee410b96763152cfd11a",
-                "sha256:2dd5b261b00adffce993dc5ffd0feb94368e1657eb16edeed62ae8fe142ac34e",
-                "sha256:b20de0b3b796f2ff2dddf14aba911bc429911583b8bbbaee2976e7fce7a56d56",
-                "sha256:63d64859599b3ddc85ae7a211051e12ed956ce1deeaddc2c620fa323b6dfa97f",
+                "sha256:914ae20e5f3574135ae270d69bd7e8cfdaacbfc561c47e587dee0dcbada3a3a2",
                 "sha256:9162ebfca987ddf1dead8406e9b5bab3a68444b13fdd5aed9eca8bdec01a58f4",
-                "sha256:20769fd9bc0837e7334ad2c6c06953024b415dbed09fd59d6a61feeb29a6fe30",
-                "sha256:ef1fb8ebbc0a0d1c92f6a2da4602e7ea10863fd546854d168c6638a0976e79fd",
+                "sha256:99416866f7a8f6eb7bfb696eedb1153ef204a67a8ce18d8cddf0c93e16010d43",
                 "sha256:99c794e427ff9cb50d7bd9ec52c4f1b89a8318f37b4ccbefdce446a7f4ec5f7c",
-                "sha256:f90b14d3c833c3d588066fec3334d5c1648a7cfee4e279dc1e553ec13082559b",
-                "sha256:456b96c606147cea58f9316092b1ac8a239e891a1e8644a932e8a3c9cafec155",
+                "sha256:a1b2926be8aff7e641ab622991f77bb9c546268d416277b1fb5efd6305206e46",
                 "sha256:adb7b6cf1bb6908cbe5b2e131e2cc22c707fbf0f9f0f27878494834683b997a2",
-                "sha256:fa1449e2a6cd96dfadf66530ba203fadfbcf54a4724628dac4104fc292b06477",
-                "sha256:18fa5c2ebb23c8f34f30a5c764ada19621a4523f83aeeb8df9fc19ecfe76f838",
-                "sha256:ea876d43fdeefebf8afa18cd647efa7b930eb8a4719ebdb1a8106cc51c446437",
-                "sha256:634dc6e204f2dedfae18a095790e3baba6b071dbe0660b2b3af0f21ea0215cd4",
-                "sha256:01dd4d25dc0fad15db3b384d04ac6cc1f75b56b48afd0a85a8d8207b44b741bb",
-                "sha256:3b49f5979e1c4603b19b3805032a1a5abaecbc0f54dc765ba1b663e765711baf",
-                "sha256:4a69850e3d5d19e3b97918de5a19f1dacd1c08a0fe8df55221fe47a2ea767931",
-                "sha256:1f865cb1999dce298746c84608ba8f2401e186691f6560a3401d812b3fdba74f",
-                "sha256:7a5fc9aead0fd4946607279ef34f379e312716abfae53e6fa6603ae3eec4308a",
-                "sha256:4568c460343f724e8944078ab165fa54d9e33fdb1867f1e3d1e231f8ca4368a6",
+                "sha256:b20de0b3b796f2ff2dddf14aba911bc429911583b8bbbaee2976e7fce7a56d56",
                 "sha256:c438452261daac308c0a19c7dfa46aeee1a93896611b483879865a0aa1615cc5",
-                "sha256:3ab86827cfc1283300cd050bad185840b150877ad5b324053f7a9455ee6e596f",
-                "sha256:6fae8c918c9f66ccfa15a7bc3b92fb9e095302f8bb7789ee59eb05b7d8c618fa",
-                "sha256:3cd107632808d1b94da6591f3bf2579ba88333650a6537b7655882487a8caac4",
-                "sha256:6e53318801aed1abf4a41d94c4cea2b89749b706ed9a79599d69df5b70ffc175",
-                "sha256:99416866f7a8f6eb7bfb696eedb1153ef204a67a8ce18d8cddf0c93e16010d43",
-                "sha256:a1b2926be8aff7e641ab622991f77bb9c546268d416277b1fb5efd6305206e46",
-                "sha256:02180988dc858739a856e9f77276298c6015e6fa9e87a6ad6362f679b2e5c2bb",
-                "sha256:ff14210232acff8a236244551834e643484ff621638c74590aa0583d3c36cc31",
+                "sha256:c6de26d1e171cdc449745b82f1addbc873d105b8e7335097da991c0fc664a4a8",
+                "sha256:d8a81a7d611936931145fa759cfacf99ff755d16e2d336677af439e128613da1",
+                "sha256:db739c3323e4b5abd4778a2b3c73b7582c5ceadb40612e0dcc20fbc1abb538a3",
+                "sha256:dd93e47651d7a7a63c32d0c8f5d6e6c50d99b7a0f2ef08a4237727d89dac8f4e",
+                "sha256:ea876d43fdeefebf8afa18cd647efa7b930eb8a4719ebdb1a8106cc51c446437",
                 "sha256:eeaf83db38425913283cf2db6caeb4c85911d3923615ea7d5b752e5ad49914ec",
-                "sha256:c6de26d1e171cdc449745b82f1addbc873d105b8e7335097da991c0fc664a4a8"
+                "sha256:ef1fb8ebbc0a0d1c92f6a2da4602e7ea10863fd546854d168c6638a0976e79fd",
+                "sha256:f21caa2aae45ebfc420bc2631acf2c8de0e8384b14565c415c2fae9dc7aacdf9",
+                "sha256:f90b14d3c833c3d588066fec3334d5c1648a7cfee4e279dc1e553ec13082559b",
+                "sha256:fa1449e2a6cd96dfadf66530ba203fadfbcf54a4724628dac4104fc292b06477",
+                "sha256:ff14210232acff8a236244551834e643484ff621638c74590aa0583d3c36cc31"
             ],
+            "index": "pypi",
             "version": "==3.6.0"
         },
         "requests": {
@@ -106,6 +95,7 @@
                 "sha256:6a1b267aa90cac58ac3a765d067950e7dbbf75b1da07e895d1f594193a40a38b",
                 "sha256:9c443e7324ba5b85070c4a818ade28bfabedf16ea10206da1132edaa6dda237e"
             ],
+            "index": "pypi",
             "version": "==2.18.4"
         },
         "urllib3": {