diff --git a/pyproject.toml b/pyproject.toml
index 4d1477c0..cf79a74e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -47,7 +47,7 @@ sphinx = "=1.4.9"
 sphinx_rtd_theme = "^0.4.3"
 livereload = "^2.6"
 mock = "^3.0"
-pytest = "^5.2"
+pytest = "~5.3.5"
 pytest-cov = "^2.8"
 pytest-pythonpath = "^0.7.3"
 pytest-sugar = "^0.9.2"