diff --git a/app/jobs/concerns/has_active_job_lock.rb b/app/jobs/concerns/has_active_job_lock.rb
index 0c09bf92f..57d784957 100644
--- a/app/jobs/concerns/has_active_job_lock.rb
+++ b/app/jobs/concerns/has_active_job_lock.rb
@@ -89,6 +89,12 @@ module HasActiveJobLock
     ActiveJobLock.transaction(isolation: :serializable) do
       yield
     end
+  # PostgeSQL prevents locking on records that are already locked
+  # for UPDATE in Serializable Isolation Level transactions,
+  # but it's safe to retry as described in the docs:
+  # https://www.postgresql.org/docs/10/transaction-iso.html
+  rescue PG::TRSerializationFailure
+    retry
   rescue ActiveRecord::RecordNotUnique
     existing_active_job_lock!
   end
diff --git a/spec/jobs/concerns/has_active_job_lock_spec.rb b/spec/jobs/concerns/has_active_job_lock_spec.rb
index e312e0274..d7354eeae 100644
--- a/spec/jobs/concerns/has_active_job_lock_spec.rb
+++ b/spec/jobs/concerns/has_active_job_lock_spec.rb
@@ -100,6 +100,29 @@ RSpec.describe HasActiveJobLock, type: :job do
         end.to have_enqueued_job(job_class).exactly(:twice)
       end
     end
+
+    if ActiveRecord::Base.connection.adapter_name == 'PostgreSQL'
+      context "when PG::TRSerializationFailure 'Could not serialize access due to concurrent update' is raised" do
+
+        it 'retries execution until succeed' do
+          allow(ActiveRecord::Base.connection).to receive(:open_transactions).and_return(0)
+          allow(ActiveJobLock).to receive(:transaction).and_call_original
+          exception_raised = false
+          allow(ActiveJobLock).to receive(:transaction).with(isolation: :serializable) do |&block|
+
+            if !exception_raised
+              exception_raised = true
+              raise PG::TRSerializationFailure, 'Could not serialize access due to concurrent update'
+            end
+
+            block.call
+          end
+
+          expect { job_class.perform_later }.to have_enqueued_job(job_class).exactly(:once)
+          expect(exception_raised).to be true
+        end
+      end
+    end
   end
 
   include_examples 'handle locking of jobs'