diff --git a/requirements.txt b/requirements.txt
index 697b6b3..5f90436 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,20 @@
+# moto[server] 5.0.0
+#
+# breaks with
+# Traceback (most recent call last):
+#   File "/usr/local/bin/sbx-mocks3-serve", line 5, in <module>
+#     from shoobx.mocks3.run import serve
+#   File "/usr/local/lib/python3.11/site-packages/shoobx/mocks3/__init__.py", line 17, in <module>
+#     from moto.backends import BACKENDS
+# ImportError: cannot import name 'BACKENDS' from 'moto.backends' (/usr/local/lib/python3.11/site-packages/moto/backends.py)
+#
+# Moto v5 is incompatible with current mocks3 implementation
+
+moto[server]==4.2.10
+
+boto3==1.34.29
+flask_cors==4.0.0
+pytz==2023.4
+
 # shoobx.mocks3
 -e .[test]