diff --git a/pyproject.toml b/pyproject.toml
index 526cbee..393b51d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,6 +19,7 @@ classifiers = [
 
 [tool.poetry.dependencies]
 python = "^3.5"
+cryptography = "2.7"
 pyOpenSSL = "~19"
 requests = "~2"