diff --git a/Pipfile b/Pipfile
index 5c1c136b5..15da2503a 100644
--- a/Pipfile
+++ b/Pipfile
@@ -23,9 +23,9 @@ imap-tools = "*"
 langdetect = "*"
 pdftotext = "*"
 pathvalidate = "*"
-# pinned to 8.1.0, since aarch64 wheels might not be available beyond that
+# pinned to 8.1.0, since aarch64 wheels might not be available beyond that https://github.com/python-pillow/Pillow/issues/5202
 pillow = "==8.1.0"
-pikepdf = "*"
+pikepdf = "~=2.2.5"
 python-gnupg = "*"
 python-dotenv = "*"
 python-dateutil = "*"
@@ -33,7 +33,7 @@ python-Levenshtein = "*"
 python-magic = "*"
 psycopg2-binary = "*"
 redis = "*"
-scikit-learn="~=0.23.2"
+scikit-learn="~=0.24.0"
 whitenoise = "~=5.2.0"
 watchdog = "*"
 whoosh="~=2.7.4"
@@ -52,6 +52,6 @@ pytest-django = "*"
 pytest-env = "*"
 pytest-sugar = "*"
 pytest-xdist = "*"
-sphinx = "~=3.3"
+sphinx = "~=3.4.2"
 sphinx_rtd_theme = "*"
 tox = "*"
diff --git a/Pipfile.lock b/Pipfile.lock
index c3aa4a4f5..dab52dbbd 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "27c8973d55150371bd18406cc90e61ad4a7ec4b9353007045d611a87120a2703"
+            "sha256": "3c85a487240f18b3feb44f8899395696cb79630f320f0df9ef5ee37b914c89f2"
         },
         "pipfile-spec": 6,
         "requires": {},
@@ -251,11 +251,11 @@
         },
         "importlib-metadata": {
             "hashes": [
-                "sha256:5c5a2720817414a6c41f0a49993908068243ae02c1635a228126519b509c8aed",
-                "sha256:bf792d480abbd5eda85794e4afb09dd538393f7d6e6ffef6e9f03d2014cf9450"
+                "sha256:ace61d5fc652dc280e7b6b4ff732a9c2d40db2c0f92bc6cb74e07b73d53a1771",
+                "sha256:fa5daa4477a7414ae34e95942e4dd07f62adf589143c875c133c1e53c4eff38d"
             ],
             "markers": "python_version < '3.8'",
-            "version": "==3.3.0"
+            "version": "==3.4.0"
         },
         "inotify-simple": {
             "hashes": [
@@ -695,26 +695,35 @@
         },
         "scikit-learn": {
             "hashes": [
-                "sha256:090bbf144fd5823c1f2efa3e1a9bf180295b24294ca8f478e75b40ed54f8036e",
-                "sha256:0a127cc70990d4c15b1019680bfedc7fec6c23d14d3719fdf9b64b22d37cdeca",
-                "sha256:0d39748e7c9669ba648acf40fb3ce96b8a07b240db6888563a7cb76e05e0d9cc",
-                "sha256:1b8a391de95f6285a2f9adffb7db0892718950954b7149a70c783dc848f104ea",
-                "sha256:20766f515e6cd6f954554387dfae705d93c7b544ec0e6c6a5d8e006f6f7ef480",
-                "sha256:2aa95c2f17d2f80534156215c87bee72b6aa314a7f8b8fe92a2d71f47280570d",
-                "sha256:5ce7a8021c9defc2b75620571b350acc4a7d9763c25b7593621ef50f3bd019a2",
-                "sha256:6c28a1d00aae7c3c9568f61aafeaad813f0f01c729bee4fd9479e2132b215c1d",
-                "sha256:7671bbeddd7f4f9a6968f3b5442dac5f22bf1ba06709ef888cc9132ad354a9ab",
-                "sha256:914ac2b45a058d3f1338d7736200f7f3b094857758895f8667be8a81ff443b5b",
-                "sha256:98508723f44c61896a4e15894b2016762a55555fbf09365a0bb1870ecbd442de",
-                "sha256:a64817b050efd50f9abcfd311870073e500ae11b299683a519fbb52d85e08d25",
-                "sha256:cb3e76380312e1f86abd20340ab1d5b3cc46a26f6593d3c33c9ea3e4c7134028",
-                "sha256:d0dcaa54263307075cb93d0bee3ceb02821093b1b3d25f66021987d305d01dce",
-                "sha256:d9a1ce5f099f29c7c33181cc4386660e0ba891b21a60dc036bf369e3a3ee3aec",
-                "sha256:da8e7c302003dd765d92a5616678e591f347460ac7b53e53d667be7dfe6d1b10",
-                "sha256:daf276c465c38ef736a79bd79fc80a249f746bcbcae50c40945428f7ece074f8"
+                "sha256:076369634ee72b5a5941440661e2f306ff4ac30903802dc52031c7e9199ac640",
+                "sha256:18f7131e62265bf2691ed1d0303c640313894ccfe4278427478c6b2f45094b53",
+                "sha256:26f66b3726b54dfb76ea51c5d9c2431ed17ebc066cb4527662b9e851a3e7ba61",
+                "sha256:2951f87d35e72f007701c6e028aa230f6df6212a3194677c0c950486066a454d",
+                "sha256:2a5348585aa793bc8cc5a72f8e9067c9380834b0aadbd55f924843b071f13282",
+                "sha256:3eeff086f7329521d27249a082ea3c48c085cedb110db5f65968ab55c3ba2e09",
+                "sha256:4395e91b3548005f4a645018435b5a94f8cce232b5b70753020e606c6a750656",
+                "sha256:44e452ea8491225c5783d49577aad0f36202dfd52aec7f82c0fdfe5fbd5f7400",
+                "sha256:490436b44b3a1957cb625e871764b0aa330b34cc416aea4abc6c38ca63d0d682",
+                "sha256:5e6e3c042cea83f2e20a45e563b8eabc1f8f72446251fe23ebefdf111a173a33",
+                "sha256:66f27bf21202a850bcd7b6303916e4907f6e22ec59a14974ede4955aed5c7ed0",
+                "sha256:743b6edd98c98991be46c08e6b21df3861d5ae915f91d59f988384d93f7263e7",
+                "sha256:758619e49cd7c17282e6cc60d5cc73c02c072b47c9a10010bb3bb47e0d976e50",
+                "sha256:7f654befc5ad413690cc58f3f34a3e906caf825195ce0fda00a8e9565e1403e6",
+                "sha256:800aaf63f8838c00e85db2267dd226f89858594843fd03932a9eda95746d2c40",
+                "sha256:80ca024154b84b6ac4cfc86930ba13fdc348a209753bf2c16129db6f9eb8a80b",
+                "sha256:890d7d588f65acb0c4f6c083347c9076916bda5e6bd8400f06244b1afc1009af",
+                "sha256:905d8934d1e27a686698864a5863ff2c0e13a2ae1adb78a8a848aacc8a49927d",
+                "sha256:a83fcd9d59c42a2f66b307e3b0b0f08aa8e6e45be33da055697ea499f0e4f7c2",
+                "sha256:afeb06dc69847927634e58579b9cdc72e1390b79497336b2324b1b173f33bd47",
+                "sha256:b0d13fd56d26cf3de0314a4fd48037108c638fe126d813f5c1222bb0f08b6a76",
+                "sha256:c08b27cb78ee8d2dc781a7affed09859441f5b624f9f92da59ac0791c8774dfc",
+                "sha256:c912247e42114f389858ae05d63f4359d4e667ea72aaabee191aee9ad3f9774a",
+                "sha256:d7fe05fcb44eadd6d6c874c768f085f5de1239db3a3b7be4d3d23d12e4120589",
+                "sha256:d819d625832fb2969911a243e009cfa135cb8ef1e150866e417d6e9d75290087",
+                "sha256:e534f5f3796db6781c87e9835dcd51b7854c8c5a379c9210b93605965c1941fd"
             ],
             "index": "pypi",
-            "version": "==0.23.2"
+            "version": "==0.24.0"
         },
         "scipy": {
             "hashes": [
@@ -789,11 +798,11 @@
         },
         "tqdm": {
             "hashes": [
-                "sha256:556c55b081bd9aa746d34125d024b73f0e2a0e62d5927ff0e400e20ee0a03b9a",
-                "sha256:b8b46036fd00176d0870307123ef06bb851096964fa7fc578d789f90ce82c3e4"
+                "sha256:4621f6823bab46a9cc33d48105753ccbea671b68bab2c50a9f0be23d4065cb5a",
+                "sha256:fe3d08dd00a526850568d542ff9de9bbc2a09a791da3c334f3213d8d0bbbca65"
             ],
             "index": "pypi",
-            "version": "==4.55.1"
+            "version": "==4.56.0"
         },
         "typing-extensions": {
             "hashes": [
@@ -988,11 +997,11 @@
         },
         "coveralls": {
             "hashes": [
-                "sha256:2301a19500b06649d2ec4f2858f9c69638d7699a4c63027c5d53daba666147cc",
-                "sha256:b990ba1f7bc4288e63340be0433698c1efe8217f78c689d254c2540af3d38617"
+                "sha256:5399c0565ab822a70a477f7031f6c88a9dd196b3de2877b3facb43b51bd13434",
+                "sha256:f8384968c57dee4b7133ae701ecdad88e85e30597d496dcba0d7fbb470dca41f"
             ],
             "index": "pypi",
-            "version": "==2.2.0"
+            "version": "==3.0.0"
         },
         "distlib": {
             "hashes": [
@@ -1034,11 +1043,11 @@
         },
         "faker": {
             "hashes": [
-                "sha256:7b0c4bb678be21a68640007f254259c73d18f7996a3448267716423360519732",
-                "sha256:7e98483fc273ec5cfe1c9efa9b99adaa2de4c6b610fbc62d3767088e4974b0ce"
+                "sha256:47ac7d62d5bad8c16422a91f121430ab7656d40ca8fea9c84bcdbdf92e739b03",
+                "sha256:6bc44606d44f711e1d89ad9a5b42394cc6f7eedaffc765ddb5b2d22084c15733"
             ],
             "markers": "python_version >= '3.6'",
-            "version": "==5.3.0"
+            "version": "==5.5.0"
         },
         "filelock": {
             "hashes": [
@@ -1067,19 +1076,19 @@
         },
         "importlib-metadata": {
             "hashes": [
-                "sha256:5c5a2720817414a6c41f0a49993908068243ae02c1635a228126519b509c8aed",
-                "sha256:bf792d480abbd5eda85794e4afb09dd538393f7d6e6ffef6e9f03d2014cf9450"
+                "sha256:ace61d5fc652dc280e7b6b4ff732a9c2d40db2c0f92bc6cb74e07b73d53a1771",
+                "sha256:fa5daa4477a7414ae34e95942e4dd07f62adf589143c875c133c1e53c4eff38d"
             ],
             "markers": "python_version < '3.8'",
-            "version": "==3.3.0"
+            "version": "==3.4.0"
         },
         "importlib-resources": {
             "hashes": [
-                "sha256:0a948d0c8c3f9344de62997e3f73444dbba233b1eaf24352933c2d264b9e4182",
-                "sha256:6b45007a479c4ec21165ae3ffbe37faf35404e2041fac6ae1da684f38530ca73"
+                "sha256:4743f090ed8946e713745ec0e660249ef9fb0b9843eacc5b5ff931d2fd5aa67f",
+                "sha256:ea17df80a0ff04b5dbd3d96dbeab1842acfd1c6c902eaeb8c8858abf2720161e"
             ],
             "markers": "python_version < '3.7'",
-            "version": "==4.1.1"
+            "version": "==5.0.0"
         },
         "iniconfig": {
             "hashes": [
@@ -1174,11 +1183,11 @@
         },
         "pygments": {
             "hashes": [
-                "sha256:ccf3acacf3782cbed4a989426012f1c535c9a90d3a7fc3f16d231b9372d2b716",
-                "sha256:f275b6c0909e5dafd2d6269a656aa90fa58ebf4a74f8fcf9053195d226b24a08"
+                "sha256:bc9591213a8f0e0ca1a5e68a479b4887fdc3e75d0774e5c71c31920c427de435",
+                "sha256:df49d09b498e83c1a73128295860250b0b7edd4c723a32e9bc0d295c7c2ec337"
             ],
             "markers": "python_version >= '3.5'",
-            "version": "==2.7.3"
+            "version": "==2.7.4"
         },
         "pyparsing": {
             "hashes": [
@@ -1285,11 +1294,11 @@
         },
         "sphinx": {
             "hashes": [
-                "sha256:77dec5ac77ca46eee54f59cf477780f4fb23327b3339ef39c8471abb829c1285",
-                "sha256:b8aa4eb5502c53d3b5ca13a07abeedacd887f7770c198952fd5b9530d973e767"
+                "sha256:41cad293f954f7d37f803d97eb184158cfd90f51195131e94875bc07cd08b93c",
+                "sha256:c314c857e7cd47c856d2c5adff514ac2e6495f8b8e0f886a8a37e9305dfea0d8"
             ],
             "index": "pypi",
-            "version": "==3.4.2"
+            "version": "==3.4.3"
         },
         "sphinx-rtd-theme": {
             "hashes": [
@@ -1371,11 +1380,11 @@
         },
         "tox": {
             "hashes": [
-                "sha256:42ce19ce5dc2f6d6b1fdc5666c476e1f1e2897359b47e0aa3a5b774f335d57c2",
-                "sha256:4321052bfe28f9d85082341ca8e233e3ea901fdd14dab8a5d3fbd810269fbaf6"
+                "sha256:5efda30ad73e662c3844ac51ce1381bf28f61063773e06996aa8b6277133a7c0",
+                "sha256:8cccede64802e78aa6c69f81051b25f0706639d1cbbb34d9366ce00c70ee054f"
             ],
             "index": "pypi",
-            "version": "==3.20.1"
+            "version": "==3.21.0"
         },
         "typing-extensions": {
             "hashes": [
@@ -1396,11 +1405,11 @@
         },
         "virtualenv": {
             "hashes": [
-                "sha256:54b05fc737ea9c9ee9f8340f579e5da5b09fb64fd010ab5757eb90268616907c",
-                "sha256:b7a8ec323ee02fb2312f098b6b4c9de99559b462775bc8fe3627a73706603c1b"
+                "sha256:205a7577275dd0d9223c730dd498e21a8910600085c3dee97412b041fc4b853b",
+                "sha256:7992b8de87e544a4ab55afc2240bf8388c4e3b5765d03784dad384bfdf9097ee"
             ],
             "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
-            "version": "==20.2.2"
+            "version": "==20.3.0"
         },
         "zipp": {
             "hashes": [
diff --git a/requirements.txt b/requirements.txt
index 9932d146b..3b7a158c1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -30,7 +30,7 @@ humanfriendly==9.1; python_version >= '2.7' and python_version not in '3.0, 3.1,
 idna==2.10; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
 imap-tools==0.34.0
 img2pdf==0.4.0
-importlib-metadata==3.3.0; python_version < '3.8'
+importlib-metadata==3.4.0; python_version < '3.8'
 inotify-simple==1.3.5; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
 inotifyrecursive==0.3.5
 joblib==1.0.0; python_version >= '3.6'
@@ -56,14 +56,14 @@ redis==3.5.3
 regex==2020.11.13
 reportlab==3.5.59
 requests==2.25.1; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'
-scikit-learn==0.23.2
+scikit-learn==0.24.0
 scipy==1.5.4; python_version >= '3.6'
 six==1.15.0; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
 sortedcontainers==2.3.0
 sqlparse==0.4.1; python_version >= '3.5'
 threadpoolctl==2.1.0; python_version >= '3.5'
 tika==1.24
-tqdm==4.55.1
+tqdm==4.56.0
 typing-extensions==3.7.4.3; python_version < '3.8'
 tzlocal==2.1
 urllib3==1.26.2; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4' and python_version < '4'