diff --git a/pyproject.toml b/pyproject.toml
index c1e0a7b..9e7a427 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -41,7 +41,7 @@ aiohttp = "^3.6.2"
 async_timeout = "^3.0.1"
 asyncio_dgram = "^1.0.1"
 python = "^3.6.1"
-voluptuous = "^0.11.7"
+voluptuous = ">=0.11.7,<0.13.0"
 
 [tool.poetry.dev-dependencies]
 Sphinx = "^3.0.0"
diff --git a/requirements_test.txt b/requirements_test.txt
index f06619b..d55d865 100644
--- a/requirements_test.txt
+++ b/requirements_test.txt
@@ -8,4 +8,4 @@ pytest-aiohttp==0.3.0
 pytest-asyncio==0.10.0
 pytest-cov==2.8.1
 pytest==5.3.5
-voluptuous==0.11.7
+voluptuous>=0.11.7,<0.13.0