diff --git a/Pipfile b/Pipfile
index f694a04..5acc706 100644
--- a/Pipfile
+++ b/Pipfile
@@ -4,7 +4,7 @@ verify_ssl = true
 name = "pypi"
 
 [packages]
-switchbot-mqtt = {editable = true,path = "."}
+switchbot-mqtt = {editable = true, path = "."}
 
 [dev-packages]
 black = "*"
@@ -14,6 +14,9 @@ pylint-import-requirements = "*"
 pytest = "*"
 pytest-cov = "*"
 
+# python3.7 compatibility
+# https://github.com/PyCQA/isort/commit/47cedf3583f338e8ce9c906fc95c9fee6c57404d
+isort = "<5.12"
 # mypy on python<3.8
 typed-ast = {markers = "python_version < '3.8'"}
 # >    File "[...]/lib/python3.10/site-packages/_pytest/_code/code.py", line 60, in <module>
diff --git a/Pipfile.lock b/Pipfile.lock
index 36a0a9c..decf8d4 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "ae10b36f861f68e2e4e5472a89d8a0c47f478bb66722e372509d1a15116daec1"
+            "sha256": "facf143168868f82eaec1df6b20a7d0ba0b9131963db59d76bf288c77d2f9078"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -182,11 +182,11 @@
         },
         "isort": {
             "hashes": [
-                "sha256:6db30c5ded9815d813932c04c2f85a360bcdd35fed496f4d8f35495ef0a261b6",
-                "sha256:c033fd0edb91000a7f09527fe5c75321878f98322a77ddcc81adbd83724afb7b"
+                "sha256:6be1f76a507cb2ecf16c7cf14a37e41609ca082330be4e3436a18ef74add55db",
+                "sha256:ba1d72fb2595a01c7895a5128f9585a5cc4b6d395f1c8d514989b9a7eb2a8746"
             ],
-            "markers": "python_version >= '3.7'",
-            "version": "==5.11.4"
+            "index": "pypi",
+            "version": "==5.11.5"
         },
         "lazy-object-proxy": {
             "hashes": [