diff --git a/buildrunner/config_model.py b/buildrunner/config_model.py
index 744f4a89..4d91897f 100644
--- a/buildrunner/config_model.py
+++ b/buildrunner/config_model.py
@@ -23,7 +23,7 @@ class StepBuild(BaseModel):
 class StepPushDict(BaseModel):
     """ Push model within a step """
     repository: str
-    tags: List[str]
+    tags: Optional[List[str]]
 
 
 class Step(BaseModel):