diff --git a/pyproject.toml b/pyproject.toml
index 0016a394..8a5ff150 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -41,7 +41,6 @@ jwtpeek = "cryptojwt.tools.jwtpeek:main"
 python = "^3.6.2"
 cryptography = ">=3.4.6"
 requests = "^2.25.1"
-readerwriterlock = "^1.0.9"
 
 [tool.poetry.dev-dependencies]
 alabaster = "^0.7.12"