diff --git a/tox.ini b/tox.ini
index a4d197d..d69edbf 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,7 +1,7 @@
 [tox]
 requires =
     tox>=4
-envlist = lint, py3{8,9,10,11,12}
+envlist = lint, type, py3{8,9,10,11,12}
 
 [testenv]
 usedevelop=true
@@ -19,10 +19,20 @@ skip_install = true
 deps = flake8
 commands = flake8
 
+[testenv:type]
+description = run type checks
+skip_install = true
+deps =
+    mypy >= 1.0
+    types-python-dateutil
+    types-vobject
+commands =
+    mypy {posargs:gcalcli}
+
 [gh]
 python =
-    3.12 = py312, lint
+    3.12 = py312, lint, type
     3.11 = py311
     3.10 = py310
     3.9 = py39
-    3.8 = py38
+    3.8 = py38, type