diff --git a/pyproject.toml b/pyproject.toml
index 4bb3103..567447e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,7 +11,7 @@ package-mode = false
 python = "^3.12"
 setuptools = ">=80.9,<83.0"
 idna = "^3.0"
-certifi = "^2025.1.31"
+certifi = ">=2025.1.31,<2027.0.0"
 bump2version = "^1.0.0"
 
 [tool.poetry.group.dev.dependencies]