diff --git a/changelog.d/623.feature b/changelog.d/623.feature
new file mode 100644
index 00000000..f6a5846f
--- /dev/null
+++ b/changelog.d/623.feature
@@ -0,0 +1 @@
+Make UserActivityTracker configurable
diff --git a/config/slack-config-schema.yaml b/config/slack-config-schema.yaml
index 234130bc..5c73957b 100644
--- a/config/slack-config-schema.yaml
+++ b/config/slack-config-schema.yaml
@@ -27,6 +27,13 @@ properties:
         type: string
       crt_file:
         type: string
+  user_activity:
+    type: object
+    properties:
+      min_user_active_days:
+        type: number
+      inactive_after_days:
+        type: number
   rtm:
     type: object
     required: ["enable"]
@@ -182,4 +189,4 @@ properties:
         type: boolean
       pantalaimon_url:
         type: string
-    required: ["enabled"]
\ No newline at end of file
+    required: ["enabled"]
diff --git a/src/IConfig.ts b/src/IConfig.ts
index e9c60500..107e2dbb 100644
--- a/src/IConfig.ts
+++ b/src/IConfig.ts
@@ -33,6 +33,10 @@ export interface IConfig {
     matrix_admin_room?: string;
 
     rmau_limit?: number;
+    user_activity?: {
+        min_user_active_days?: number;
+        inactive_after_days?: number;
+    };
 
     homeserver: {
         url: string;
diff --git a/src/Main.ts b/src/Main.ts
index fe68ca26..b73506b4 100644
--- a/src/Main.ts
+++ b/src/Main.ts
@@ -1153,8 +1153,17 @@ export class Main {
         await teamSyncPromise;
 
         if (!(this.datastore instanceof NedbDatastore)) {
+            const uatConfig = {
+                ...UserActivityTrackerConfig.DEFAULT,
+            };
+            if (this.config.user_activity?.min_user_active_days !== undefined) {
+                uatConfig.minUserActiveDays = this.config.user_activity.min_user_active_days;
+            }
+            if (this.config.user_activity?.inactive_after_days !== undefined) {
+                uatConfig.inactiveAfterDays = this.config.user_activity.inactive_after_days;
+            }
             this.bridge.opts.controller.userActivityTracker = new UserActivityTracker(
-                UserActivityTrackerConfig.DEFAULT,
+                uatConfig,
                 await this.datastore.getUserActivity(),
                 async (changes) => this.onUserActivityChanged(changes),
             );