diff --git a/pyproject.toml b/pyproject.toml
index 2bddaf0..79449f2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,6 +21,7 @@ classifiers = [
 dependencies = [
     "argparse",
     "asyncio",
+    "cryptography",
     "secp256k1",
     "websockets"
 ]