diff --git a/plugins/snmp/poller.py b/plugins/snmp/poller.py
index 22599e9..0b24713 100644
--- a/plugins/snmp/poller.py
+++ b/plugins/snmp/poller.py
@@ -1,10 +1,11 @@
 # plugins/snmp/poller.py
 """Ask an SNMP device for its readings, and say in words why it didn't answer.
 
-pysnmp-lextudio 6.x (what the image installs) and canonical pysnmp 7.x put the
-asyncio API in different modules with different names; _api() finds whichever
-is installed, so a dependency bump can't silently break polling. Without
-pysnmp at all the poll reports that instead of raising.
+pysnmp 7.x (what the image installs, #5470) and the deprecated
+pysnmp-lextudio 6.x put the asyncio API in different modules with different
+names; _api() finds whichever is installed, so a dependency change can't
+silently break polling. Without pysnmp at all the poll reports that instead
+of raising.
 """
 from __future__ import annotations
 
diff --git a/pyproject.toml b/pyproject.toml
index de5781d..36b988b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,7 +28,10 @@ ldap = [
     "ldap3>=2.9",
 ]
 snmp = [
-    "pysnmp-lextudio>=6.2",
+    # The maintained pysnmp (lextudio's lineage, which took over the name).
+    # Floor 7.1: below 7 that name is the abandoned 4.x line, which has no
+    # asyncio API (#5470; the poller uses pysnmp.hlapi.v3arch.asyncio).
+    "pysnmp>=7.1",
 ]
 # Batteries-included Ansible (bundles the common community collections) for the
 # playbook runner. Installed into the image via Dockerfile `pip install .[ansible]`.