diff --git a/plugin_compatibility.json b/plugin_compatibility.json
index 269ea5c..5feec3a 100644
--- a/plugin_compatibility.json
+++ b/plugin_compatibility.json
@@ -2,6 +2,7 @@
   {
     "moodle": "MOODLE_404_STABLE",
     "PHP": [
+      "8.1",
       "8.2",
       "8.3"
     ]
@@ -9,6 +10,7 @@
   {
     "moodle": "MOODLE_405_STABLE",
     "PHP": [
+      "8.1",
       "8.2",
       "8.3"
     ]