diff --git a/pyproject.toml b/pyproject.toml
index 1e7b676..d1780ee 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,7 +34,7 @@ python-dateutil = "^2.8"
 black = ">23.1,<25.0"
 parameterized = "^0.9.0"
 coverage = "^6.1.2"
-coveralls = "^3.3.1"
+coveralls = ">=3.3.1,<5.0.0"
 
 [build-system]
 requires = ["poetry-core>=1.0.0"]