diff --git a/src/c3nav/api/__init__.py b/src/c3nav/api/__init__.py
index 5d3f3ed1..ed1be8ff 100644
--- a/src/c3nav/api/__init__.py
+++ b/src/c3nav/api/__init__.py
@@ -1,6 +1,6 @@
 from functools import wraps
-from rest_framework.generics import GenericAPIView
 
+from rest_framework.generics import GenericAPIView
 from rest_framework.renderers import JSONRenderer
 
 from c3nav.mapdata.utils.json import json_encoder_reindent
diff --git a/src/c3nav/mapdata/api.py b/src/c3nav/mapdata/api.py
index c04fd8ad..def6b983 100644
--- a/src/c3nav/mapdata/api.py
+++ b/src/c3nav/mapdata/api.py
@@ -87,7 +87,7 @@ def api_etag(permissions=True, etag_func=AccessPermission.etag_func, cache_param
                 if cache_parameters is not None:
                     for param, type_ in cache_parameters.items():
                         value = int(param in request.GET) if type_ == bool else type_(request.GET.get(param))
-                        cache_key += ':'+urlsafe_base64_encode(str(value).encode()).decode()
+                        cache_key += ':'+urlsafe_base64_encode(str(value).encode())
                 data = request_cache.get(cache_key)
                 if data is not None:
                     response = Response(data)
diff --git a/src/c3nav/mapdata/fields.py b/src/c3nav/mapdata/fields.py
index 948a8f44..7edf1169 100644
--- a/src/c3nav/mapdata/fields.py
+++ b/src/c3nav/mapdata/fields.py
@@ -78,7 +78,7 @@ class GeometryField(models.TextField):
             'point': (Point, )
         }[self.geomtype]
 
-    def _validate_geomtype(self, value, exception: typing.Type[Exception]=ValidationError):
+    def _validate_geomtype(self, value, exception: typing.Type[Exception] = ValidationError):
         if not isinstance(value, self.classes):
             raise exception('Expected %s instance, got %s instead.' % (' or '.join(c.__name__ for c in self.classes),
                                                                        repr(value)))
diff --git a/src/c3nav/mapdata/models/__init__.py b/src/c3nav/mapdata/models/__init__.py
index 20ae3182..f7572fa6 100644
--- a/src/c3nav/mapdata/models/__init__.py
+++ b/src/c3nav/mapdata/models/__init__.py
@@ -1,8 +1,8 @@
-from c3nav.mapdata.models.update import MapUpdate  # noqa
 from c3nav.mapdata.models.access import AccessRestriction  # noqa
+from c3nav.mapdata.models.geometry.level import AltitudeArea, Building, Door, Space  # noqa
+from c3nav.mapdata.models.geometry.space import AltitudeMarker, Area, Hole, LineObstacle, Obstacle, Stair  # noqa
+from c3nav.mapdata.models.graph import GraphEdge, GraphNode, WayType  # noqa
 from c3nav.mapdata.models.level import Level  # noqa
-from c3nav.mapdata.models.geometry.level import Building, Space, Door, AltitudeArea  # noqa
-from c3nav.mapdata.models.geometry.space import Area, Stair, Obstacle, LineObstacle, Hole, AltitudeMarker  # noqa
-from c3nav.mapdata.models.locations import Location, LocationSlug, LocationGroup, LocationGroupCategory  # noqa
+from c3nav.mapdata.models.locations import Location, LocationGroup, LocationGroupCategory, LocationSlug  # noqa
 from c3nav.mapdata.models.source import Source  # noqa
-from c3nav.mapdata.models.graph import GraphNode, WayType, GraphEdge  # noqa
+from c3nav.mapdata.models.update import MapUpdate  # noqa
diff --git a/src/c3nav/mapdata/render/engines/__init__.py b/src/c3nav/mapdata/render/engines/__init__.py
index 13070edf..db74d088 100644
--- a/src/c3nav/mapdata/render/engines/__init__.py
+++ b/src/c3nav/mapdata/render/engines/__init__.py
@@ -1,13 +1,13 @@
 from django.conf import settings
 from django.core import checks
 
-from c3nav.mapdata.render.engines.base import register_engine, get_engine, get_engine_filetypes  # noqa
+from c3nav.mapdata.render.engines.base import get_engine, get_engine_filetypes, register_engine  # noqa
 from c3nav.mapdata.render.engines.blender import BlenderEngine  # noqa
-from c3nav.mapdata.render.engines.openscadold import OldOpenSCADEngine  # noqa
 from c3nav.mapdata.render.engines.openscad import OpenSCADEngine  # noqa
-from c3nav.mapdata.render.engines.wavefront import WavefrontEngine  # noqa
+from c3nav.mapdata.render.engines.openscadold import OldOpenSCADEngine  # noqa
 from c3nav.mapdata.render.engines.stl import STLEngine  # noqa
 from c3nav.mapdata.render.engines.svg import SVGEngine  # noqa
+from c3nav.mapdata.render.engines.wavefront import WavefrontEngine  # noqa
 
 
 @checks.register()
diff --git a/src/c3nav/mapdata/render/geometry/__init__.py b/src/c3nav/mapdata/render/geometry/__init__.py
index 6bc17b9e..1c2c39c2 100644
--- a/src/c3nav/mapdata/render/geometry/__init__.py
+++ b/src/c3nav/mapdata/render/geometry/__init__.py
@@ -1,3 +1,3 @@
-from c3nav.mapdata.render.geometry.hybrid import hybrid_union, HybridGeometry  # noqa
-from c3nav.mapdata.render.geometry.level import LevelGeometries  # noqa
 from c3nav.mapdata.render.geometry.altitudearea import AltitudeAreaGeometries  # noqa
+from c3nav.mapdata.render.geometry.hybrid import HybridGeometry, hybrid_union  # noqa
+from c3nav.mapdata.render.geometry.level import LevelGeometries  # noqa
diff --git a/src/requirements-tileserver.txt b/src/requirements-tileserver.txt
index 32227c6c..6c7f1602 100644
--- a/src/requirements-tileserver.txt
+++ b/src/requirements-tileserver.txt
@@ -1,3 +1,3 @@
-requests>=2.19,<2.20
-numpy>=1.15,<1.16
-pylibmc>=1.5,<1.6
+requests==2.22.0
+numpy==1.17.4
+pylibmc==1.6.1
diff --git a/src/requirements/dev.txt b/src/requirements/dev.txt
index 9128ca2f..c67a3651 100644
--- a/src/requirements/dev.txt
+++ b/src/requirements/dev.txt
@@ -1,4 +1,4 @@
-flake8>=3.5,<3.6
-pycodestyle>=2.3,<2.4
+flake8==3.7.9
+pycodestyle==2.5.0
 isort
 django-debug-toolbar
diff --git a/src/requirements/htmlmin.txt b/src/requirements/htmlmin.txt
index 6c909096..25b7131a 100644
--- a/src/requirements/htmlmin.txt
+++ b/src/requirements/htmlmin.txt
@@ -1 +1 @@
-django-htmlmin>=0.10,<0.11
+django-htmlmin==0.11.0
diff --git a/src/requirements/opengl.txt b/src/requirements/opengl.txt
index 09a4976d..6ec6c7bf 100644
--- a/src/requirements/opengl.txt
+++ b/src/requirements/opengl.txt
@@ -1 +1 @@
-ModernGL>=5.4,<5.5
+ModernGL==5.5.4
diff --git a/src/requirements/production.txt b/src/requirements/production.txt
index 4d708d77..1925f84f 100644
--- a/src/requirements/production.txt
+++ b/src/requirements/production.txt
@@ -1,17 +1,17 @@
-Django>=2.1,<2.2
-django-bootstrap3>=11.0,<11.1
-django-compressor==2.2
-csscompressor
-djangorestframework>=3.9,<3.10
-django-filter>=2.0,<2.1
-shapely>=1.6,<1.7
-pybind11>=2.2,<2.3
-MeshPy>=2018.2,<2018.3
-rtree>=0.8,<0.9
-celery>=4.2,<4.3
-requests>=2.19,<2.20
-Pillow>=6.2,<6.3
-qrcode>=6.0,<6.1
-matplotlib>=2.2,<2.3
-scipy>=1.1,<1.2
-django_libsass>=0.7,<0.8
+Django==2.2.8
+django-bootstrap3==12.0.0
+django-compressor==2.3
+csscompressor==0.9.5
+djangorestframework==3.10.3
+django-filter==2.2.0
+shapely==1.6.4.post2
+pybind11==2.4.3
+MeshPy==2018.2.1
+# rtree==0.9.1
+celery==4.3.0
+requests==2.22.0
+Pillow==6.2.1
+qrcode==6.1
+matplotlib==3.1.2
+scipy==1.3.3
+django_libsass==0.7
diff --git a/src/requirements/redis.txt b/src/requirements/redis.txt
index 0db31905..f9b781eb 100644
--- a/src/requirements/redis.txt
+++ b/src/requirements/redis.txt
@@ -1,2 +1,2 @@
-django-redis>=4.9,<4.10
-redis>=2.10,<2.11
+django-redis==4.10.0
+redis==3.3.11
diff --git a/src/requirements/rsvg.txt b/src/requirements/rsvg.txt
index d93b0758..1fa13d3a 100644
--- a/src/requirements/rsvg.txt
+++ b/src/requirements/rsvg.txt
@@ -1,2 +1,2 @@
 pgi==0.0.11.2
-cairocffi>=0.9,<0.10
+cairocffi==1.1.0
diff --git a/src/requirements/sentry.txt b/src/requirements/sentry.txt
index ea66cca1..fb470dba 100644
--- a/src/requirements/sentry.txt
+++ b/src/requirements/sentry.txt
@@ -1 +1 @@
-sentry-sdk>=0.6.2,<0.7
\ No newline at end of file
+sentry-sdk==0.13.5