diff --git a/pyproject.toml b/pyproject.toml
index 7bde62a848..1425b88236 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -62,6 +62,7 @@ jinxed = [
 ]
 python3-xlib = { version="*", markers = "sys_platform == 'linux'"}
 enlighten = "^1.9.0"
+slack-sdk = "^3.6.0"
 
 [tool.poetry.dev-dependencies]
 flake8 = "^3.7"