diff --git a/pyproject.toml b/pyproject.toml
index 8fb6ab8..fb42f98 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -54,7 +54,6 @@ sphinx = ">=6,<8"
 sphinx-autodoc-typehints = "^1.3.0"
 sphinx-rtd-theme = ">=1.3,<4.0"
 backoff = ">=1.4.3"
-certifi = ">=2018.4.16"
 expiringdict = ">=1.1.4"
 pyrfc3339 = ">=1.0"
 jsonpickle = ">1.4.1"