diff --git a/pyproject.toml b/pyproject.toml
index 094d6f27..499edd57 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,7 +25,7 @@ packages = [
 
 [tool.poetry.dependencies]
 python = "^3.8"
-urllib3 = "^1.26.9"
+urllib3 = "^1.26.9,<2.0"
 websockets = ">=10.3,<12.0"
 certifi = ">=2022.5.18,<2024.0.0"