diff --git a/pyproject.toml b/pyproject.toml
index a5f2124..c3b83bb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,7 +28,7 @@ classifiers = [
 requires-python = ">=3.10"
 dependencies = [
     "anyio==4.13.0",
-    "certifi==2026.4.22",
+    "certifi==2026.5.20",
     "cffi==2.0.0",
     "cryptography==48.0.0",
     "exceptiongroup==1.3.1",
diff --git a/requirements.txt b/requirements.txt
index c53cfd7..d5cbcea 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 anyio==4.13.0
-certifi==2026.4.22
+certifi==2026.5.20
 cffi==2.0.0
 cryptography==48.0.0
 exceptiongroup==1.3.1