diff --git a/Pipfile b/Pipfile
index 43b9afd3f..504b267c4 100644
--- a/Pipfile
+++ b/Pipfile
@@ -21,6 +21,8 @@ fuzzywuzzy = {extras = ["speedup"], version = "*"}
 gunicorn = "*"
 imap-tools = "*"
 langdetect = "*"
+# numpy 1.20.0 drops python 3.6 support
+numpy = "~=1.19.5"
 pdftotext = "*"
 pathvalidate = "*"
 # pinned to 8.1.0, since aarch64 wheels might not be available beyond that https://github.com/python-pillow/Pillow/issues/5202
diff --git a/Pipfile.lock b/Pipfile.lock
index 4da3d625d..fafec4310 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "70117fd0d9bc10ab46b05ec2c58b59ca0e52b32a3c3e4e130c83bcfb70b51d5f"
+            "sha256": "aec5aa96fc4cad6d06f00d0ada0f8bd193f42874f476d39e76fc69d05c78f9f6"
         },
         "pipfile-spec": 6,
         "requires": {},
@@ -550,34 +550,44 @@
         },
         "numpy": {
             "hashes": [
-                "sha256:0d28a54afcf46f1f9ebd163e49ad6b49087f22986fefd01a23ca0c1cdda25ca6",
-                "sha256:1264c66129f5ef63187649dd43f1ca59532e8c098723643336a85131c0dcce3f",
-                "sha256:1abc02e30e3efd81a4571e00f8e62bf42e343c76698e0a3e11d9c2b3ee0d77a7",
-                "sha256:2445a96fbae23a4109c61be0f0af0f3bc273905dc5687a710850c1dfde0fc994",
-                "sha256:2bf0e68c92ef077fe766e53f8937d8ac341bdbca68ec128ae049b7d5c34e3206",
-                "sha256:33edfc0eb229f86f539493917b34035054313a11afbed48404aaf9f86bf4b0f6",
-                "sha256:3d8233c03f116d068d5365fed4477f2947c7229582dad81e5953088989294cec",
-                "sha256:4d592264d2a4f368afbb4288b5ceb646d4cbaf559c0249c096fbb0a149806b90",
-                "sha256:5ae765dd29c71a555f8102281f6fb15a3f4dbd35f6e7daf36af9df6d9dd716a5",
-                "sha256:894aaee60043a98b03f0ad992c810f62e3a15f98a701e1c0f58a4f4a0df13429",
-                "sha256:89bd70c9ad540febe6c28451ba225eb4e49d27f64728357f512c808002325dfa",
-                "sha256:93c2abea7bb69f47029b84ceac30ab46dfcfdb99b671ad850a333ff794a765e4",
-                "sha256:abdfa075e293d73638ece434708aa60b510dc6e70d805f57f481a0f550b25a9e",
-                "sha256:afeee581b50df20ef07b736e62ca612858f1fcdba96651d26ab44e3d567a4e6e",
-                "sha256:b51b9ef0624f4b01b846c981034c10d2e30db33f9f8be71e992f3900741f6f77",
-                "sha256:b66a6c15d793eda7cdad986e737775aa31b9306d588c14dd0277d2dda5546150",
-                "sha256:bd08254aac78b363b14acac456038ce6438bad848e02b275837930115e41ea21",
-                "sha256:cb257bb0c0a3176c32782a63cfab2eace7eabfa2a3b2dfd85a13700617ccaf28",
-                "sha256:cf5d9dcbdbe523fa665c5309cce5f144648d94a7fddbf5a40f8e0d5c9f5b596d",
-                "sha256:d1bc331e1706fd1809a1bc8a31205329e5b30cf5ba50461c624da267e99f6ae6",
-                "sha256:db5e69d08756a2fa75a42b4e433880b6187768fe1bc73d21819def893e5128c6",
-                "sha256:e3db646af9f6a145f0c57202f4b55d4a33f975e395e78fb7b394644c17c1a3a6",
-                "sha256:e9c5fd330d2fedf06051bafb996252de9b032fcb2ec03eefc9a543e56efa66d4",
-                "sha256:eee454d3aa3955d0c0069a0f265fea47f1e1384c35a110a95efed358eb6e1562",
-                "sha256:f1e9424e9aa3834ea27cc12f9c6ea8ace5da18ee60a720bb3a85b2f733f41782"
+                "sha256:012426a41bc9ab63bb158635aecccc7610e3eff5d31d1eb43bc099debc979d94",
+                "sha256:06fab248a088e439402141ea04f0fffb203723148f6ee791e9c75b3e9e82f080",
+                "sha256:0eef32ca3132a48e43f6a0f5a82cb508f22ce5a3d6f67a8329c81c8e226d3f6e",
+                "sha256:1ded4fce9cfaaf24e7a0ab51b7a87be9038ea1ace7f34b841fe3b6894c721d1c",
+                "sha256:2e55195bc1c6b705bfd8ad6f288b38b11b1af32f3c8289d6c50d47f950c12e76",
+                "sha256:2ea52bd92ab9f768cc64a4c3ef8f4b2580a17af0a5436f6126b08efbd1838371",
+                "sha256:36674959eed6957e61f11c912f71e78857a8d0604171dfd9ce9ad5cbf41c511c",
+                "sha256:384ec0463d1c2671170901994aeb6dce126de0a95ccc3976c43b0038a37329c2",
+                "sha256:39b70c19ec771805081578cc936bbe95336798b7edf4732ed102e7a43ec5c07a",
+                "sha256:400580cbd3cff6ffa6293df2278c75aef2d58d8d93d3c5614cd67981dae68ceb",
+                "sha256:43d4c81d5ffdff6bae58d66a3cd7f54a7acd9a0e7b18d97abb255defc09e3140",
+                "sha256:50a4a0ad0111cc1b71fa32dedd05fa239f7fb5a43a40663269bb5dc7877cfd28",
+                "sha256:603aa0706be710eea8884af807b1b3bc9fb2e49b9f4da439e76000f3b3c6ff0f",
+                "sha256:6149a185cece5ee78d1d196938b2a8f9d09f5a5ebfbba66969302a778d5ddd1d",
+                "sha256:6373751c4b6fd325606d29dd98dc2bf7092485ad20aafbfc6a177acd3b89059e",
+                "sha256:759e4095edc3c1b3ac031f34d9459fa781777a93ccc633a472a5468587a190ff",
+                "sha256:7fb43004bce0ca31d8f13a6eb5e943fa73371381e53f7074ed21a4cb786c32f8",
+                "sha256:811daee36a58dc79cf3d8bdd4a490e4277d0e4b7d103a001a4e73ddb48e7e6aa",
+                "sha256:8b5e972b43c8fc27d56550b4120fe6257fdc15f9301914380b27f74856299fea",
+                "sha256:99abf4f353c3d1a0c7a5f27699482c987cf663b1eac20db59b8c7b061eabd7fc",
+                "sha256:a0d53e51a6cb6f0d9082decb7a4cb6dfb33055308c4c44f53103c073f649af73",
+                "sha256:a12ff4c8ddfee61f90a1633a4c4afd3f7bcb32b11c52026c92a12e1325922d0d",
+                "sha256:a4646724fba402aa7504cd48b4b50e783296b5e10a524c7a6da62e4a8ac9698d",
+                "sha256:a76f502430dd98d7546e1ea2250a7360c065a5fdea52b2dffe8ae7180909b6f4",
+                "sha256:a9d17f2be3b427fbb2bce61e596cf555d6f8a56c222bd2ca148baeeb5e5c783c",
+                "sha256:ab83f24d5c52d60dbc8cd0528759532736b56db58adaa7b5f1f76ad551416a1e",
+                "sha256:aeb9ed923be74e659984e321f609b9ba54a48354bfd168d21a2b072ed1e833ea",
+                "sha256:c843b3f50d1ab7361ca4f0b3639bf691569493a56808a0b0c54a051d260b7dbd",
+                "sha256:cae865b1cae1ec2663d8ea56ef6ff185bad091a5e33ebbadd98de2cfa3fa668f",
+                "sha256:cc6bd4fd593cb261332568485e20a0712883cf631f6f5e8e86a52caa8b2b50ff",
+                "sha256:cf2402002d3d9f91c8b01e66fbb436a4ed01c6498fffed0e4c7566da1d40ee1e",
+                "sha256:d051ec1c64b85ecc69531e1137bb9751c6830772ee5c1c426dbcfe98ef5788d7",
+                "sha256:d6631f2e867676b13026e2846180e2c13c1e11289d67da08d71cacb2cd93d4aa",
+                "sha256:dbd18bcf4889b720ba13a27ec2f2aac1981bd41203b3a3b27ba7a33f88ae4827",
+                "sha256:df609c82f18c5b9f6cb97271f03315ff0dbe481a2a02e56aeb1b1a985ce38e60"
             ],
-            "markers": "python_version >= '3.7'",
-            "version": "==1.20.0"
+            "index": "pypi",
+            "version": "==1.19.5"
         },
         "ocrmypdf": {
             "hashes": [