diff --git a/Pipfile b/Pipfile
index fd98a862..efdde6f4 100644
--- a/Pipfile
+++ b/Pipfile
@@ -4,16 +4,15 @@ verify_ssl = true
 name = "pypi"
 
 [packages]
-daphne = "~=4.0"
-dj-rest-auth = "~=5.0"
-django = "~=3.2"
-django-admin-list-filter-dropdown = "~=1.0"
-django-allauth = "~=0.58"
-django-filter = "~=2.4"
-djangorestframework = "~=3.12"
-drf-writable-nested = "~=0.6"
-pillow = "~=10.1"
-python-magic = "~=0.4"
+daphne = "~=4.0.0"
+dj-rest-auth = "~=5.0.1"
+django = "~=3.2.23"
+django-allauth = "~=0.58.2"
+django-filter = "~=23.5"
+djangorestframework = "~=3.14.0"
+drf-writable-nested = "~=0.7.0"
+pillow = "~=10.1.0"
+python-magic = "~=0.4.27"
 
 [dev-packages]
 autopep8 = "*"
diff --git a/Pipfile.lock b/Pipfile.lock
index e75337c2..39e54c6f 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "803c4e611b77467770322c7a93b52aa6b500e3120b7ea245c7d4cab0ba1c5eda"
+            "sha256": "3f2fe266ea548f12ced01f1df62094483d80c31c1781d213826d42274d097d3e"
         },
         "pipfile-spec": 6,
         "requires": {},
@@ -249,7 +249,6 @@
                 "sha256:cce9afc8f49a4f15d4270b8cfb0e0fe811b770a5cc795474e97e4da287497666"
             ],
             "index": "pypi",
-            "markers": "python_version >= '3.7'",
             "version": "==4.0.0"
         },
         "defusedxml": {
@@ -265,7 +264,6 @@
                 "sha256:aad7d912476169e9991547bf98645344d3939be2d7052098048d819524c115d9"
             ],
             "index": "pypi",
-            "markers": "python_version >= '3.6'",
             "version": "==5.0.2"
         },
         "django": {
@@ -274,33 +272,22 @@
                 "sha256:d48608d5f62f2c1e260986835db089fa3b79d6f58510881d316b8d88345ae6e1"
             ],
             "index": "pypi",
-            "markers": "python_version >= '3.6'",
             "version": "==3.2.23"
         },
-        "django-admin-list-filter-dropdown": {
-            "hashes": [
-                "sha256:07cd37b6a9be1b08f11d4a92957c69b67bc70b1f87a2a7d4ae886c93ea51eb53",
-                "sha256:bf1b48bab9772dad79db71efef17e78782d4f2421444d5e49bb10e0da71cd6bb"
-            ],
-            "index": "pypi",
-            "version": "==1.0.3"
-        },
         "django-allauth": {
             "hashes": [
                 "sha256:b2ad19223e561ef333a54d6c03d52144b0148ce79822eaf708424a0d829f24c8"
             ],
             "index": "pypi",
-            "markers": "python_version >= '3.7'",
             "version": "==0.58.2"
         },
         "django-filter": {
             "hashes": [
-                "sha256:84e9d5bb93f237e451db814ed422a3a625751cbc9968b484ecc74964a8696b06",
-                "sha256:e00d32cebdb3d54273c48f4f878f898dced8d5dfaad009438fe61ebdf535ace1"
+                "sha256:67583aa43b91fe8c49f74a832d95f4d8442be628fd4c6d65e9f811f5153a4e5c",
+                "sha256:99122a201d83860aef4fe77758b69dda913e874cc5e0eaa50a86b0b18d708400"
             ],
             "index": "pypi",
-            "markers": "python_version >= '3.5'",
-            "version": "==2.4.0"
+            "version": "==23.5"
         },
         "djangorestframework": {
             "hashes": [
@@ -308,7 +295,6 @@
                 "sha256:eb63f58c9f218e1a7d064d17a70751f528ed4e1d35547fdade9aaf4cd103fd08"
             ],
             "index": "pypi",
-            "markers": "python_version >= '3.6'",
             "version": "==3.14.0"
         },
         "drf-writable-nested": {
@@ -316,7 +302,6 @@
                 "sha256:154c0381e8a3a477e0fd539d5e1caf8ff4c1097a9c0c0fe741d4858b11b0455b"
             ],
             "index": "pypi",
-            "markers": "python_version >= '3.7'",
             "version": "==0.7.0"
         },
         "hyperlink": {
@@ -407,7 +392,6 @@
                 "sha256:fe1e26e1ffc38be097f0ba1d0d07fcade2bcfd1d023cda5b29935ae8052bd793"
             ],
             "index": "pypi",
-            "markers": "python_version >= '3.8'",
             "version": "==10.1.0"
         },
         "pyasn1": {
@@ -457,7 +441,6 @@
                 "sha256:c212960ad306f700aa0d01e5d7a325d20548ff97eb9920dcd29513174f0294d3"
             ],
             "index": "pypi",
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
             "version": "==0.4.27"
         },
         "python3-openid": {
@@ -600,6 +583,14 @@
         }
     },
     "develop": {
+        "annotated-types": {
+            "hashes": [
+                "sha256:0641064de18ba7a25dee8f96403ebc39113d0cb953a01429249d5c7564666a43",
+                "sha256:563339e807e53ffd9c267e99fc6d9ea23eb8443c08f112651963e24e22f84a5d"
+            ],
+            "markers": "python_version >= '3.8'",
+            "version": "==0.6.0"
+        },
         "asgiref": {
             "hashes": [
                 "sha256:89b2ef2247e3b562a16eef663bc0e2e703ec6468e2fa8a5cd61cd449786d4f6e",
@@ -622,9 +613,15 @@
                 "sha256:2913064abd97b3419d1cc83ea71f042cb821f87e45b9c88cad5ad3c4ea87fe0c"
             ],
             "index": "pypi",
-            "markers": "python_version >= '3.6'",
             "version": "==2.0.4"
         },
+        "cerberus": {
+            "hashes": [
+                "sha256:7649a5815024d18eb7c6aa5e7a95355c649a53aacfc9b050e9d0bf6bfa2af372",
+                "sha256:81011e10266ef71b6ec6d50e60171258a5b134d69f8fb387d16e4936d0d47642"
+            ],
+            "version": "==1.3.5"
+        },
         "certifi": {
             "hashes": [
                 "sha256:9b469f3a900bf28dc19b8cfbf8019bf47f7fdd1a65a1d4ffb98fc14166beb4d1",
@@ -751,13 +748,19 @@
             "markers": "python_version >= '3.11'",
             "version": "==0.3.7"
         },
+        "distlib": {
+            "hashes": [
+                "sha256:2e24928bc811348f0feb63014e97aaae3037f2cf48712d51ae61df7fd6075057",
+                "sha256:9dafe54b34a028eafd95039d5e5d4851a13734540f1331060d31c9916e7147a8"
+            ],
+            "version": "==0.3.7"
+        },
         "django": {
             "hashes": [
                 "sha256:82968f3640e29ef4a773af2c28448f5f7a08d001c6ac05b32d02aeee6509508b",
                 "sha256:d48608d5f62f2c1e260986835db089fa3b79d6f58510881d316b8d88345ae6e1"
             ],
             "index": "pypi",
-            "markers": "python_version >= '3.6'",
             "version": "==3.2.23"
         },
         "django-rest-swagger": {
@@ -782,9 +785,14 @@
                 "sha256:eb63f58c9f218e1a7d064d17a70751f528ed4e1d35547fdade9aaf4cd103fd08"
             ],
             "index": "pypi",
-            "markers": "python_version >= '3.6'",
             "version": "==3.14.0"
         },
+        "docopt": {
+            "hashes": [
+                "sha256:49b3a825280bd66b3aa83585ef59c4a8c82f2c8a522dbe754a8bc8d08c85c491"
+            ],
+            "version": "==0.6.2"
+        },
         "idna": {
             "hashes": [
                 "sha256:9ecdbbd083b06798ae1e86adcbfe8ab1479cf864e4ee30fe4e46a003d12491ca",
@@ -795,11 +803,11 @@
         },
         "isort": {
             "hashes": [
-                "sha256:8bef7dde241278824a6d83f44a544709b065191b95b6e50894bdc722fcba0504",
-                "sha256:f84c2818376e66cf843d497486ea8fed8700b340f308f076c6fb1229dff318b6"
+                "sha256:15e0e937819b350bc256a7ae13bb25f4fe4f8871a0bc335b20c3627dba33f458",
+                "sha256:d67f78c6a1715f224cca46b29d740037bdb6eea15323a133e897cda15876147b"
             ],
             "markers": "python_full_version >= '3.8.0'",
-            "version": "==5.12.0"
+            "version": "==5.13.0"
         },
         "itypes": {
             "hashes": [
@@ -896,6 +904,38 @@
             ],
             "version": "==1.3.2"
         },
+        "pep517": {
+            "hashes": [
+                "sha256:1b2fa2ffd3938bb4beffe5d6146cbcb2bda996a5a4da9f31abffd8b24e07b317",
+                "sha256:31b206f67165b3536dd577c5c3f1518e8fbaf38cbc57efff8369a392feff1721"
+            ],
+            "markers": "python_version >= '3.6'",
+            "version": "==0.13.1"
+        },
+        "pip": {
+            "hashes": [
+                "sha256:1fcaa041308d01f14575f6d0d2ea4b75a3e2871fe4f9c694976f908768e14174",
+                "sha256:55eb67bb6171d37447e82213be585b75fe2b12b359e993773aca4de9247a052b"
+            ],
+            "markers": "python_version >= '3.7'",
+            "version": "==23.3.1"
+        },
+        "pip-api": {
+            "hashes": [
+                "sha256:2a0314bd31522eb9ffe8a99668b0d07fee34ebc537931e7b6483001dbedcbdc9",
+                "sha256:a05df2c7aa9b7157374bcf4273544201a0c7bae60a9c65bcf84f3959ef3896f3"
+            ],
+            "markers": "python_version >= '3.7'",
+            "version": "==0.0.30"
+        },
+        "pipreqs": {
+            "hashes": [
+                "sha256:a17f167880b6921be37533ce4c81ddc6e22b465c107aad557db43b1add56a99b",
+                "sha256:e522b9ed54aa3e8b7978ff251ab7a9af2f75d2cd8de4c102e881b666a79a308e"
+            ],
+            "markers": "python_version >= '3.7'",
+            "version": "==0.4.13"
+        },
         "platformdirs": {
             "hashes": [
                 "sha256:11c8f37bcca40db96d8144522d925583bdb7a31f7b0e37e3ed4318400a8e2380",
@@ -904,6 +944,17 @@
             "markers": "python_version >= '3.8'",
             "version": "==4.1.0"
         },
+        "plette": {
+            "extras": [
+                "validation"
+            ],
+            "hashes": [
+                "sha256:06b8c09eb90293ad0b8101cb5c95c4ea53e9b2b582901845d0904ff02d237454",
+                "sha256:42d68ce8c6b966874b68758d87d7f20fcff2eff0d861903eea1062126be4d98f"
+            ],
+            "markers": "python_version >= '3.7'",
+            "version": "==0.4.4"
+        },
         "pycodestyle": {
             "hashes": [
                 "sha256:41ba0e7afc9752dfb53ced5489e89f8186be00e599e712660695b7a75ff2663f",
@@ -912,13 +963,131 @@
             "markers": "python_version >= '3.8'",
             "version": "==2.11.1"
         },
+        "pydantic": {
+            "hashes": [
+                "sha256:80c50fb8e3dcecfddae1adbcc00ec5822918490c99ab31f6cf6140ca1c1429f0",
+                "sha256:ff177ba64c6faf73d7afa2e8cad38fd456c0dbe01c9954e71038001cd15a6edd"
+            ],
+            "markers": "python_version >= '3.7'",
+            "version": "==2.5.2"
+        },
+        "pydantic-core": {
+            "hashes": [
+                "sha256:038c9f763e650712b899f983076ce783175397c848da04985658e7628cbe873b",
+                "sha256:074f3d86f081ce61414d2dc44901f4f83617329c6f3ab49d2bc6c96948b2c26b",
+                "sha256:079206491c435b60778cf2b0ee5fd645e61ffd6e70c47806c9ed51fc75af078d",
+                "sha256:09b0e985fbaf13e6b06a56d21694d12ebca6ce5414b9211edf6f17738d82b0f8",
+                "sha256:0f6116a558fd06d1b7c2902d1c4cf64a5bd49d67c3540e61eccca93f41418124",
+                "sha256:103ef8d5b58596a731b690112819501ba1db7a36f4ee99f7892c40da02c3e189",
+                "sha256:16e29bad40bcf97aac682a58861249ca9dcc57c3f6be22f506501833ddb8939c",
+                "sha256:206ed23aecd67c71daf5c02c3cd19c0501b01ef3cbf7782db9e4e051426b3d0d",
+                "sha256:2248485b0322c75aee7565d95ad0e16f1c67403a470d02f94da7344184be770f",
+                "sha256:27548e16c79702f1e03f5628589c6057c9ae17c95b4c449de3c66b589ead0520",
+                "sha256:2d0ae0d8670164e10accbeb31d5ad45adb71292032d0fdb9079912907f0085f4",
+                "sha256:3128e0bbc8c091ec4375a1828d6118bc20404883169ac95ffa8d983b293611e6",
+                "sha256:3387277f1bf659caf1724e1afe8ee7dbc9952a82d90f858ebb931880216ea955",
+                "sha256:34708cc82c330e303f4ce87758828ef6e457681b58ce0e921b6e97937dd1e2a3",
+                "sha256:35613015f0ba7e14c29ac6c2483a657ec740e5ac5758d993fdd5870b07a61d8b",
+                "sha256:3ad873900297bb36e4b6b3f7029d88ff9829ecdc15d5cf20161775ce12306f8a",
+                "sha256:40180930807ce806aa71eda5a5a5447abb6b6a3c0b4b3b1b1962651906484d68",
+                "sha256:439c9afe34638ace43a49bf72d201e0ffc1a800295bed8420c2a9ca8d5e3dbb3",
+                "sha256:45e95333b8418ded64745f14574aa9bfc212cb4fbeed7a687b0c6e53b5e188cd",
+                "sha256:4641e8ad4efb697f38a9b64ca0523b557c7931c5f84e0fd377a9a3b05121f0de",
+                "sha256:49b08aae5013640a3bfa25a8eebbd95638ec3f4b2eaf6ed82cf0c7047133f03b",
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+                "sha256:4ce601907e99ea5b4adb807ded3570ea62186b17f88e271569144e8cca4409c7",
+                "sha256:4e40f2bd0d57dac3feb3a3aed50f17d83436c9e6b09b16af271b6230a2915459",
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+                "sha256:57d52fa717ff445cb0a5ab5237db502e6be50809b43a596fb569630c665abddf",
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+                "sha256:652c1988019752138b974c28f43751528116bcceadad85f33a258869e641d753",
+                "sha256:6637560562134b0e17de333d18e69e312e0458ee4455bdad12c37100b7cad706",
+                "sha256:678265f7b14e138d9a541ddabbe033012a2953315739f8cfa6d754cc8063e8ca",
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+                "sha256:774de879d212db5ce02dfbf5b0da9a0ea386aeba12b0b95674a4ce0593df3d07",
+                "sha256:77fa384d8e118b3077cccfcaf91bf83c31fe4dc850b5e6ee3dc14dc3d61bdba1",
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+                "sha256:853a2295c00f1d4429db4c0fb9475958543ee80cfd310814b5c0ef502de24dda",
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+                "sha256:a71891847f0a73b1b9eb86d089baee301477abef45f7eaf303495cd1473613e4",
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+                "sha256:af36f36538418f3806048f3b242a1777e2540ff9efaa667c27da63d2749dbce0",
+                "sha256:b53e9ad053cd064f7e473a5f29b37fc4cc9dc6d35f341e6afc0155ea257fc911",
+                "sha256:b7851992faf25eac90bfcb7bfd19e1f5ffa00afd57daec8a0042e63c74a4551b",
+                "sha256:b9b759b77f5337b4ea024f03abc6464c9f35d9718de01cfe6bae9f2e139c397e",
+                "sha256:ba39688799094c75ea8a16a6b544eb57b5b0f3328697084f3f2790892510d144",
+                "sha256:ba6b6b3846cfc10fdb4c971980a954e49d447cd215ed5a77ec8190bc93dd7bc5",
+                "sha256:bb4c2eda937a5e74c38a41b33d8c77220380a388d689bcdb9b187cf6224c9720",
+                "sha256:c0b97ec434041827935044bbbe52b03d6018c2897349670ff8fe11ed24d1d4ab",
+                "sha256:c1452a1acdf914d194159439eb21e56b89aa903f2e1c65c60b9d874f9b950e5d",
+                "sha256:c2027d05c8aebe61d898d4cffd774840a9cb82ed356ba47a90d99ad768f39789",
+                "sha256:c2adbe22ab4babbca99c75c5d07aaf74f43c3195384ec07ccbd2f9e3bddaecec",
+                "sha256:c2d97e906b4ff36eb464d52a3bc7d720bd6261f64bc4bcdbcd2c557c02081ed2",
+                "sha256:c339dabd8ee15f8259ee0f202679b6324926e5bc9e9a40bf981ce77c038553db",
+                "sha256:c6eae413494a1c3f89055da7a5515f32e05ebc1a234c27674a6956755fb2236f",
+                "sha256:c949f04ecad823f81b1ba94e7d189d9dfb81edbb94ed3f8acfce41e682e48cef",
+                "sha256:c97bee68898f3f4344eb02fec316db93d9700fb1e6a5b760ffa20d71d9a46ce3",
+                "sha256:ca61d858e4107ce5e1330a74724fe757fc7135190eb5ce5c9d0191729f033209",
+                "sha256:cb4679d4c2b089e5ef89756bc73e1926745e995d76e11925e3e96a76d5fa51fc",
+                "sha256:cb774298da62aea5c80a89bd58c40205ab4c2abf4834453b5de207d59d2e1651",
+                "sha256:ccd4d5702bb90b84df13bd491be8d900b92016c5a455b7e14630ad7449eb03f8",
+                "sha256:cf9d3fe53b1ee360e2421be95e62ca9b3296bf3f2fb2d3b83ca49ad3f925835e",
+                "sha256:d2ae91f50ccc5810b2f1b6b858257c9ad2e08da70bf890dee02de1775a387c66",
+                "sha256:d37f8ec982ead9ba0a22a996129594938138a1503237b87318392a48882d50b7",
+                "sha256:d81e6987b27bc7d101c8597e1cd2bcaa2fee5e8e0f356735c7ed34368c471550",
+                "sha256:dcf4e6d85614f7a4956c2de5a56531f44efb973d2fe4a444d7251df5d5c4dcfd",
+                "sha256:de790a3b5aa2124b8b78ae5faa033937a72da8efe74b9231698b5a1dd9be3405",
+                "sha256:e47e9a08bcc04d20975b6434cc50bf82665fbc751bcce739d04a3120428f3e27",
+                "sha256:e60f112ac88db9261ad3a52032ea46388378034f3279c643499edb982536a093",
+                "sha256:e87fc540c6cac7f29ede02e0f989d4233f88ad439c5cdee56f693cc9c1c78077",
+                "sha256:eac5c82fc632c599f4639a5886f96867ffced74458c7db61bc9a66ccb8ee3113",
+                "sha256:ebb4e035e28f49b6f1a7032920bb9a0c064aedbbabe52c543343d39341a5b2a3",
+                "sha256:ec1e72d6412f7126eb7b2e3bfca42b15e6e389e1bc88ea0069d0cc1742f477c6",
+                "sha256:ef98ca7d5995a82f43ec0ab39c4caf6a9b994cb0b53648ff61716370eadc43cf",
+                "sha256:f0cbc7fff06a90bbd875cc201f94ef0ee3929dfbd5c55a06674b60857b8b85ed",
+                "sha256:f4791cf0f8c3104ac668797d8c514afb3431bc3305f5638add0ba1a5a37e0d88",
+                "sha256:f5e412d717366e0677ef767eac93566582518fe8be923361a5c204c1a62eaafe",
+                "sha256:fb2ed8b3fe4bf4506d6dab3b93b83bbc22237e230cba03866d561c3577517d18",
+                "sha256:fe0a5a1025eb797752136ac8b4fa21aa891e3d74fd340f864ff982d649691867"
+            ],
+            "markers": "python_version >= '3.7'",
+            "version": "==2.14.5"
+        },
         "pylint": {
             "hashes": [
                 "sha256:0d4c286ef6d2f66c8bfb527a7f8a629009e42c99707dec821a03e1b51a4c1496",
                 "sha256:60ed5f3a9ff8b61839ff0348b3624ceeb9e6c2a92c514d81c9cc273da3b6bcda"
             ],
             "index": "pypi",
-            "markers": "python_full_version >= '3.8.0'",
             "version": "==3.0.2"
         },
         "pylint-django": {
@@ -927,7 +1096,6 @@
                 "sha256:5abd5c2228e0e5e2a4cb6d0b4fc1d1cef1e773d0be911412f4dd4fc1a1a440b7"
             ],
             "index": "pypi",
-            "markers": "python_version >= '3.7' and python_version < '4.0'",
             "version": "==2.5.5"
         },
         "pylint-plugin-utils": {
@@ -953,6 +1121,22 @@
             "markers": "python_version >= '3.7'",
             "version": "==2.31.0"
         },
+        "requirementslib": {
+            "hashes": [
+                "sha256:28f8e0b1c38b34ae06de68ef115b03bbcdcdb99f9e9393333ff06ded443e3f24",
+                "sha256:67b42903d7c32f89c7047d1020c619d37cb515c475a4ae6f4e5683e1c56d7bf7"
+            ],
+            "markers": "python_version >= '3.7'",
+            "version": "==3.0.0"
+        },
+        "setuptools": {
+            "hashes": [
+                "sha256:1e8fdff6797d3865f37397be788a4e3cba233608e9b509382a2777d25ebde7f2",
+                "sha256:735896e78a4742605974de002ac60562d286fa8051a7e2299445e8e8fbb01aa6"
+            ],
+            "markers": "python_version >= '3.8'",
+            "version": "==69.0.2"
+        },
         "simplejson": {
             "hashes": [
                 "sha256:0405984f3ec1d3f8777c4adc33eac7ab7a3e629f3b1c05fdded63acc7cf01137",
@@ -1073,13 +1257,20 @@
             "markers": "python_version >= '3.7'",
             "version": "==0.12.3"
         },
+        "typing-extensions": {
+            "hashes": [
+                "sha256:8f92fc8806f9a6b641eaa5318da32b44d401efaac0f6678c9bc448ba3605faa0",
+                "sha256:df8e4339e9cb77357558cbdbceca33c303714cf861d1eef15e1070055ae8b7ef"
+            ],
+            "markers": "python_version >= '3.8'",
+            "version": "==4.8.0"
+        },
         "unidecode": {
             "hashes": [
                 "sha256:3c90b4662aa0de0cb591884b934ead8d2225f1800d8da675a7750cbc3bd94610",
                 "sha256:663a537f506834ed836af26a81b210d90cbde044c47bfbdc0fbbc9f94c86a6e4"
             ],
             "index": "pypi",
-            "markers": "python_version >= '3.5'",
             "version": "==1.3.7"
         },
         "uritemplate": {
@@ -1097,6 +1288,13 @@
             ],
             "markers": "python_version >= '3.8'",
             "version": "==2.1.0"
+        },
+        "yarg": {
+            "hashes": [
+                "sha256:4f9cebdc00fac946c9bf2783d634e538a71c7d280a4d806d45fd4dc0ef441492",
+                "sha256:55695bf4d1e3e7f756496c36a69ba32c40d18f821e38f61d028f6049e5e15911"
+            ],
+            "version": "==0.1.9"
         }
     }
 }
diff --git a/competition/admin.py b/competition/admin.py
index 8a2e9ce1..dc3c938f 100644
--- a/competition/admin.py
+++ b/competition/admin.py
@@ -1,6 +1,5 @@
 from django.contrib import admin, messages
 from django.http import HttpResponseRedirect
-from django_admin_listfilter_dropdown.filters import RelatedDropdownFilter
 
 from competition.models import (Comment, Event, EventRegistration, LateTag,
                                 Problem, ProblemCorrection, Publication,
@@ -151,8 +150,8 @@ class CommentAdmin(admin.ModelAdmin):
     )
 
     list_filter = (
-        ('posted_by', RelatedDropdownFilter),
-        ('problem', RelatedDropdownFilter),
+        'posted_by',
+        'problem',
         'state',
     )
 
@@ -168,10 +167,10 @@ class EventRegistrationAdmin(admin.ModelAdmin):
     )
 
     list_filter = (
-        ('profile', RelatedDropdownFilter),
-        ('school', RelatedDropdownFilter),
-        ('grade', RelatedDropdownFilter),
-        ('event', RelatedDropdownFilter),
+        'profile',
+        'school',
+        'grade',
+        'event',
     )
 
     ordering = (
@@ -186,7 +185,7 @@ class ProblemCorrectionAdmin(admin.ModelAdmin):
     )
 
     list_filter = (
-        ('problem', RelatedDropdownFilter),
+        'problem',
     )
 
 
diff --git a/requirements.txt b/requirements.txt
index a34f821b..d40d6144 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,9 +1,11 @@
+annotated-types==0.6.0
 asgiref==3.7.2
 astroid==3.0.1
 attrs==23.1.0
 autobahn==23.6.2
 Automat==22.10.0
 autopep8==2.0.4
+Cerberus==1.3.5
 certifi==2023.11.17
 cffi==1.16.0
 charset-normalizer==3.3.2
@@ -14,31 +16,38 @@ cryptography==41.0.7
 daphne==4.0.0
 defusedxml==0.7.1
 dill==0.3.7
+distlib==0.3.7
 dj-rest-auth==5.0.2
 Django==3.2.23
-django-admin-list-filter-dropdown==1.0.3
 django-allauth==0.58.2
-django-filter==2.4.0
+django-filter==23.5
 django-rest-swagger==2.2.0
 django-typomatic==2.4.2
 djangorestframework==3.14.0
+docopt==0.6.2
 drf-writable-nested==0.7.0
 hyperlink==21.0.0
 idna==3.6
 incremental==22.10.0
-isort==5.12.0
+isort==5.13.0
 itypes==1.2.0
 Jinja2==3.1.2
 MarkupSafe==2.1.3
 mccabe==0.7.0
 oauthlib==3.2.2
 openapi-codec==1.3.2
+pep517==0.13.1
 Pillow==10.1.0
+pip-api==0.0.30
+pipreqs==0.4.13
 platformdirs==4.1.0
+plette==0.4.4
 pyasn1==0.5.1
 pyasn1-modules==0.3.0
 pycodestyle==2.11.1
 pycparser==2.21
+pydantic==2.5.2
+pydantic_core==2.14.5
 PyJWT==2.8.0
 pylint==3.0.2
 pylint-django==2.5.5
@@ -49,6 +58,7 @@ python3-openid==3.2.0
 pytz==2023.3.post1
 requests==2.31.0
 requests-oauthlib==1.3.1
+requirementslib==3.0.0
 service-identity==23.1.0
 simplejson==3.19.2
 six==1.16.0
@@ -60,4 +70,5 @@ typing_extensions==4.8.0
 Unidecode==1.3.7
 uritemplate==4.1.1
 urllib3==2.1.0
+yarg==0.1.9
 zope.interface==6.1
diff --git a/webstrom/settings.py b/webstrom/settings.py
index fa48fe09..d1f66d66 100644
--- a/webstrom/settings.py
+++ b/webstrom/settings.py
@@ -27,7 +27,6 @@
     'django.contrib.staticfiles',
     'django.contrib.sites',
     'django.contrib.flatpages',
-    'django_admin_listfilter_dropdown',
 ]
 
 THIRD_PARTY_APPS = [