diff --git a/action.yml b/action.yml
index 311659a..0d1626e 100644
--- a/action.yml
+++ b/action.yml
@@ -9,7 +9,7 @@ inputs:
     required: true
   key:
     description: SSH private key used to connect to the host
-    required: false
+    required: true
   options:
     description: Extra options that should be passed to ansible-playbook command
     required: false