diff --git a/requirements-cwl.txt b/requirements-cwl.txt
index 5d1c3202c7..ff3084b490 100644
--- a/requirements-cwl.txt
+++ b/requirements-cwl.txt
@@ -1,4 +1,4 @@
-cwltool==3.1.20240708091337
+cwltool==3.1.20240909164951
 schema-salad>=8.4.20230128170514,<9
 galaxy-tool-util<25
 galaxy-util<25
diff --git a/src/toil/batchSystems/abstractGridEngineBatchSystem.py b/src/toil/batchSystems/abstractGridEngineBatchSystem.py
index 5f7d570ccd..24bd4bb4fb 100644
--- a/src/toil/batchSystems/abstractGridEngineBatchSystem.py
+++ b/src/toil/batchSystems/abstractGridEngineBatchSystem.py
@@ -257,6 +257,8 @@ def _runStep(self):
                 newJob = self.newJobsQueue.get()
                 if newJob is None:
                     logger.debug('Received queue sentinel.')
+                    # Send out kill signals before stopping
+                    self.killJobs()
                     return False
             if self.killJobs():
                 activity = True
@@ -414,7 +416,7 @@ def issueBatchJob(self, command: str, jobDesc, job_environment: Optional[Dict[st
                         gpus = accelerator['count']
             else:
                 gpus = jobDesc.accelerators
-            
+
             self.newJobsQueue.put((jobID, jobDesc.cores, jobDesc.memory, command, get_job_kind(jobDesc.get_names()),
                                    job_environment, gpus))
             logger.debug("Issued the job command: %s with job id: %s and job name %s", command, str(jobID),
@@ -497,6 +499,11 @@ def shutdown(self) -> None:
         """
         Signals thread to shutdown (via sentinel) then cleanly joins the thread
         """
+
+        for jobID in self.getIssuedBatchJobIDs():
+            # Send kill signals to any jobs that might be running
+            self.killQueue.put(jobID)
+
         self.shutdownLocal()
         newJobsQueue = self.newJobsQueue
         self.newJobsQueue = None
diff --git a/src/toil/test/wdl/testfiles/wait.wdl b/src/toil/test/wdl/testfiles/wait.wdl
new file mode 100644
index 0000000000..08024fffc5
--- /dev/null
+++ b/src/toil/test/wdl/testfiles/wait.wdl
@@ -0,0 +1,34 @@
+version 1.0
+
+workflow wait {
+    input {
+    }
+
+    call waiter_task {
+    input:
+    }
+
+    output {
+        String result = read_lines(waiter_task.out)[0]
+    }
+}
+
+task waiter_task {
+    input {
+    }
+
+    command <<<
+        sleep 10 &
+        sleep 2 &
+        wait
+        echo "waited"
+    >>>
+
+    output {
+        File out = stdout()
+    }
+
+    runtime {
+        docker: "ubuntu:22.04"
+    }
+}
diff --git a/src/toil/test/wdl/wdltoil_test.py b/src/toil/test/wdl/wdltoil_test.py
index 4873f5a7bf..6de389b11c 100644
--- a/src/toil/test/wdl/wdltoil_test.py
+++ b/src/toil/test/wdl/wdltoil_test.py
@@ -17,6 +17,7 @@
 from toil.fileStores import FileID
 from toil.provisioners import cluster_factory
 from toil.test import (ToilTest,
+                       needs_docker,
                        needs_docker_cuda,
                        needs_google_storage,
                        needs_singularity_or_docker,
@@ -165,6 +166,21 @@ def test_url_to_file(self):
         assert 'url_to_file.first_line' in result
         assert isinstance(result['url_to_file.first_line'], str)
         self.assertEqual(result['url_to_file.first_line'], 'chr1\t248387328')
+    
+    @needs_docker
+    def test_wait(self):
+        """
+        Test if Bash "wait" works in WDL scripts.
+        """
+        wdl = os.path.abspath('src/toil/test/wdl/testfiles/wait.wdl')
+
+        result_json = subprocess.check_output(
+            self.base_command + [wdl, '-o', self.output_dir, '--logInfo', '--retryCount=0', '--wdlContainer=docker'])
+        result = json.loads(result_json)
+
+        assert 'wait.result' in result
+        assert isinstance(result['wait.result'], str)
+        self.assertEqual(result['wait.result'], 'waited')
 
     def test_url_to_optional_file(self):
         """
diff --git a/src/toil/wdl/wdltoil.py b/src/toil/wdl/wdltoil.py
index 12094a42d6..158398dd5f 100755
--- a/src/toil/wdl/wdltoil.py
+++ b/src/toil/wdl/wdltoil.py
@@ -2089,7 +2089,8 @@ def add_injections(self, command_string: str, task_container: TaskContainer) ->
                 }
                 """)
             parts.append(script)
-            parts.append(f"_toil_resource_monitor {self.INJECTED_MESSAGE_DIR} &")
+            # Launch in a subshell so that it doesn't interfere with Bash "wait" in the main shell
+            parts.append(f"(_toil_resource_monitor {self.INJECTED_MESSAGE_DIR} &)")
 
         if isinstance(task_container, SwarmContainer) and platform.system() == "Darwin":
             # With gRPC FUSE file sharing, files immediately downloaded before