diff --git a/.gitignore b/.gitignore
index 8dceefe2..9abb2f85 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,3 +12,4 @@ htmlcov/
 test.py
 *.egg-info
 docs/_build/
+.mypy_cache/
diff --git a/Makefile b/Makefile
index 3db3c5e2..6bdd31ad 100644
--- a/Makefile
+++ b/Makefile
@@ -14,7 +14,7 @@ lint:
 	python setup.py check -rms
 	flake8 arq/ tests/
 	pytest arq -p no:sugar -q --cache-clear
-	mypy --fast-parser --ignore-missing-imports --follow-imports=skip arq/
+	mypy --ignore-missing-imports --follow-imports=skip arq/
 
 .PHONY: test
 test:
diff --git a/arq/worker.py b/arq/worker.py
index 3eb7d306..43cbb922 100644
--- a/arq/worker.py
+++ b/arq/worker.py
@@ -13,7 +13,8 @@
 from datetime import datetime
 from importlib import import_module, reload
 from multiprocessing import Process
-from signal import Signals  # type: ignore
+from signal import Signals
+from typing import Dict, Set  # noqa
 
 from .jobs import Job
 from .logs import default_log_config
diff --git a/tests/requirements.txt b/tests/requirements.txt
index 0f886dbc..63273c04 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -1,7 +1,7 @@
 coverage==4.3.4
 docutils==0.13.1
 flake8==3.3.0
-mypy==0.471
+mypy==0.510
 pycodestyle==2.3.1
 pyflakes==1.5.0
 pytest==3.0.7