diff --git a/scripts/install.sh b/scripts/install.sh
index 32a3204e8..570d7d1fc 100755
--- a/scripts/install.sh
+++ b/scripts/install.sh
@@ -2,13 +2,11 @@
 # ./scripts/install.sh
 # Installs all project dependencies (testing, optional, and tools)
 
-set -e
-
 script_dir=$(dirname $0)
 cd ${script_dir}/..
 
 pip install -U pip
 
-pip install -U -r requirements/testing.txt \
-  -U -r requirements/optional.txt \
-  -U -r requirements/tools.txt
+pip install -U -r requirements/testing.txt
+pip install -U -r requirements/optional.txt
+pip install -U -r requirements/tools.txt
diff --git a/scripts/run_validation.sh b/scripts/run_validation.sh
index db6eef6f9..e8742d468 100755
--- a/scripts/run_validation.sh
+++ b/scripts/run_validation.sh
@@ -2,8 +2,6 @@
 # all: ./scripts/run_validation.sh
 # single: ./scripts/run_validation.sh tests/slack_sdk_async/web/test_web_client_coverage.py
 
-set -e
-
 script_dir=`dirname $0`
 cd ${script_dir}/..
 
diff --git a/scripts/uninstall_all.sh b/scripts/uninstall_all.sh
index 71a1e51f6..a78ed0328 100755
--- a/scripts/uninstall_all.sh
+++ b/scripts/uninstall_all.sh
@@ -6,5 +6,6 @@ pip uninstall -y slack-sdk
 PACKAGES=$(pip freeze | grep -v "^-e" | sed 's/@.*//' | sed 's/\=\=.*//')
 # uninstall packages without exiting on a failure 
 for package in $PACKAGES; do
-  pip uninstall -y $package
+  pip uninstall -y $package &
 done
+wait
diff --git a/tests/rtm/test_rtm_client_functional.py b/tests/rtm/test_rtm_client_functional.py
index a7323342b..97d1f2eed 100644
--- a/tests/rtm/test_rtm_client_functional.py
+++ b/tests/rtm/test_rtm_client_functional.py
@@ -12,6 +12,8 @@
     cleanup_mock_web_api_server,
 )
 
+websockets_key = web.AppKey("websockets", list) if hasattr(web, "AppKey") else "websockets"
+
 
 class TestRTMClientFunctional(unittest.TestCase):
     def setUp(self):
@@ -53,7 +55,7 @@ def tearDown(self):
 
     async def mock_server(self):
         app = web.Application()
-        app["websockets"] = []
+        app[websockets_key] = []
         app.router.add_get("/", self.websocket_handler)
         app.on_shutdown.append(self.on_shutdown)
         runner = web.AppRunner(app)
@@ -65,16 +67,16 @@ async def websocket_handler(self, request):
         ws = web.WebSocketResponse()
         await ws.prepare(request)
 
-        request.app["websockets"].append(ws)
+        request.app[websockets_key].append(ws)
         try:
             async for msg in ws:
                 await ws.send_json({"type": "message", "message_sent": msg.json()})
         finally:
-            request.app["websockets"].remove(ws)
+            request.app[websockets_key].remove(ws)
         return ws
 
     async def on_shutdown(self, app):
-        for ws in set(app["websockets"]):
+        for ws in set(app[websockets_key]):
             await ws.close(code=WSCloseCode.GOING_AWAY, message="Server shutdown")
 
     # -------------------------------------------
diff --git a/tests/slack_sdk/socket_mode/mock_socket_mode_server.py b/tests/slack_sdk/socket_mode/mock_socket_mode_server.py
index b08bb3252..bc8c00546 100644
--- a/tests/slack_sdk/socket_mode/mock_socket_mode_server.py
+++ b/tests/slack_sdk/socket_mode/mock_socket_mode_server.py
@@ -46,17 +46,11 @@ def reset_server_state():
     self.reset_server_state = reset_server_state
 
     async def health(request: web.Request):
-        wr = web.Response()
-        await wr.prepare(request)
-        wr.set_status(200)
-        return wr
+        return web.Response(status=200)
 
     async def disconnect(request: web.Request):
         state["disconnect"] = True
-        wr = web.Response()
-        await wr.prepare(request)
-        wr.set_status(200)
-        return wr
+        return web.Response(status=200)
 
     async def link(request):
         connected = True