diff --git a/action.yml b/action.yml
index 68ba3d2..7dc7e27 100644
--- a/action.yml
+++ b/action.yml
@@ -4,10 +4,10 @@ description: Install the given nim version
 inputs:
   nimVersion:
     description: a nim version string like 2.2.2 or 2.0.8
-    required: true
+    required: false
   os:
     description: a os string like "linux" "windows"
-    required: true
+    required: false
 
 #runs:
 #  using: docker