diff --git a/requirements/test_adapter.txt b/requirements/test_adapter.txt
index 0757e7bce..44af631f4 100644
--- a/requirements/test_adapter.txt
+++ b/requirements/test_adapter.txt
@@ -2,7 +2,11 @@
 
 # moto
 # Note: for AWS tests
-moto>=3,<6
+# Note: moto drops old Pythons across the 5.x line — 5.0.0 requires >=3.8, 5.1.0 >=3.9, 5.2.0 >=3.10; older interpreters stay on the last compatible release.
+moto>=3,<5; python_version < "3.8"
+moto>=3,<5.1; python_version >= "3.8" and python_version < "3.9"
+moto>=3,<5.2; python_version >= "3.9" and python_version < "3.10"
+moto>=5.2.2,<6; python_version >= "3.10"
 
 # boddle
 # Note: for Bottle app tests