diff --git a/.travis.yml b/.travis.yml
index f7b1e2b0c..6e6bc35bf 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,7 +11,7 @@ jobs:
     - python: 3.6
       script: make -j 4 pytest pylint pytype
     - python: 3.7
-      script: make -j 4 check
+      script: make -j 4 check pytype
 
 notifications:
   email:
diff --git a/Makefile b/Makefile
index 6224fe189..93bda0f1b 100644
--- a/Makefile
+++ b/Makefile
@@ -54,15 +54,31 @@ uninstall:
 # Prerequisites
 ######################
 
-REQS := .build/pyrunreqs .build/pydevreqs .build/jsreqs
+REQS := .build/pyrunreqs .build/jsreqs
 
 .build/pyrunreqs: requirements.txt
 	pip install -r $<
 	./tools/typecheck-setup.sh
 	touch $@
 
-.build/pydevreqs: requirements.dev
-	pip install -r $<
+.build/pytest-deps:
+	pip install nose mock
+	touch $@
+
+.build/mypy-deps:
+	pip install mypy==0.750
+	touch $@
+
+.build/pylint-deps:
+	pip install pylint
+	touch $@
+
+.build/pyimport-deps:
+	pip install isort
+	touch $@
+
+.build/pytype-deps:
+	pip install pytype
 	touch $@
 
 .build/jsreqs: ts/package.json
@@ -108,30 +124,30 @@ run: build
 ######################
 
 .PHONY: check
-check: mypy pyimports pytest pylint pytype checkpretty
+check: mypy pyimports pytest pylint checkpretty
 
 # Checking python
 ######################
 
 PYCHECKDEPS := $(BUILDDEPS) $(shell find anki aqt -name '*.py' | grep -v buildhash.py)
 
-.build/mypy: $(PYCHECKDEPS)
+.build/mypy: .build/mypy-deps $(PYCHECKDEPS)
 	mypy anki aqt
 	touch $@
 
-.build/pytest: $(PYCHECKDEPS)
+.build/pytest: .build/pytest-deps $(PYCHECKDEPS)
 	./tools/tests.sh
 	touch $@
 
-.build/pylint: $(PYCHECKDEPS)
+.build/pylint: .build/pylint-deps $(PYCHECKDEPS)
 	pylint -j 0 --rcfile=.pylintrc -f colorized --extension-pkg-whitelist=PyQt5 anki aqt
 	touch $@
 
-.build/pytype: $(PYCHECKDEPS)
+.build/pytype: .build/pytype-deps $(PYCHECKDEPS)
 	pytype --config pytype.conf
 	touch $@
 
-.build/pyimports: $(PYCHECKDEPS)
+.build/pyimports: .build/pyimport-deps $(PYCHECKDEPS)
 	isort -rc anki aqt --check # if this fails, run 'make fixpyimports'
 	touch $@
 
diff --git a/README.contributing b/README.contributing
index 957fed0f1..bf966b2a7 100644
--- a/README.contributing
+++ b/README.contributing
@@ -49,14 +49,17 @@ avoid 'Any' when a proper type is impractical.
 When adding type signatures, please avoid refactoring the code, as this is
 liable to break add-ons or introduce regressions.
 
-Anki's Makefile invokes two type checkers - mypy and pytype. Mypy is fast, but
-not very good at type inference, so it is mostly useful for checking code
+When running 'make check', Anki uses mypy to typecheck the code. Mypy is fast,
+but not very good at type inference, so it is mostly useful for checking code
 that has type signatures. It is able to read the bundled Qt stubs, and works
 across the whole Anki codebase.
 
-pytype is much slower, but is better able to infer types when typing hints
-are unavailable. It is not able to check the aqt/* code, as it can't read
-the Qt stubs, and it is not currently compatible with Python 3.8.
+When you use 'make pytype', Anki will typecheck the code with pytype. Pytype
+is much slower, but it can catch errors in untyped code that mypy misses. It
+is not able to check the aqt/* code, as it can't read the Qt stubs, and it is
+not currently compatible with Python 3.8. It can also be difficult to build,
+so it is not included in the default 'make check', but it will be run when a
+pull request is submitted.
 
 The Qt stubs are not perfect, so you'll find when doing things like connecting
 signals, you may have to add the following to the end of a line to silence
diff --git a/requirements.dev b/requirements.dev
deleted file mode 100644
index 40d55e331..000000000
--- a/requirements.dev
+++ /dev/null
@@ -1,6 +0,0 @@
-nose
-mypy==0.750
-pylint
-mock
-pytype
-isort