diff --git a/awx/main/models/jobs.py b/awx/main/models/jobs.py
index fa9e16c1da..067ea2e759 100644
--- a/awx/main/models/jobs.py
+++ b/awx/main/models/jobs.py
@@ -312,11 +312,13 @@ class Job(UnifiedJob, JobOptions):
                 if obj.inventory_source in inventory_sources:
                     inventory_sources_found.append(obj.inventory_source)
         if not project_found and self.project.scm_update_on_launch:
-            dependencies.append(self.project.create_project_update(launch_type='dependency'))
+            if not self.project.last_job_run + datetime.timedelta(seconds=self.project.scm_update_cache_timeout) > now():
+                dependencies.append(self.project.create_project_update(launch_type='dependency'))
         if inventory_sources.count(): # and not has_setup_failures?  Probably handled as an error scenario in the task runner
             for source in inventory_sources:
                 if not source in inventory_sources_found:
-                    dependencies.append(source.create_inventory_update(launch_type='dependency'))
+                    if not source.last_job_run + datetime.timedelta(seconds=source.update_cache_timeout) > now():
+                        dependencies.append(source.create_inventory_update(launch_type='dependency'))
         return dependencies
 
     def signal_start(self, **kwargs):