diff --git a/buildman/component/buildcomponent.py b/buildman/component/buildcomponent.py
index a7bf21c54..d518d3453 100644
--- a/buildman/component/buildcomponent.py
+++ b/buildman/component/buildcomponent.py
@@ -20,6 +20,8 @@ HEARTBEAT_DELTA = datetime.timedelta(seconds=30)
 HEARTBEAT_TIMEOUT = 10
 INITIAL_TIMEOUT = 25
 
+SUPPORTED_WORKER_VERSIONS = ['0.1-beta']
+
 logger = logging.getLogger(__name__)
 
 class ComponentStatus(object):
@@ -281,14 +283,18 @@ class BuildComponent(BaseComponent):
     """ Ping pong. """
     return 'pong'
 
-  def _on_ready(self, token):
+  def _on_ready(self, token, version):
+    if not version in SUPPORTED_WORKER_VERSIONS:
+      logger.warning('Build component (token "%s") is running an out-of-date version: %s', version)
+      return False
+
     if self._component_status != 'waiting':
       logger.warning('Build component (token "%s") is already connected', self.expected_token)
-      return
+      return False
 
     if token != self.expected_token:
       logger.warning('Builder token mismatch. Expected: "%s". Found: "%s"', self.expected_token, token)
-      return
+      return False
 
     self._set_status(ComponentStatus.RUNNING)