diff --git a/src/function/sync/apply-actions/dispatch-parent-action/index.ts b/src/function/sync/apply-actions/dispatch-parent-action/index.ts
index ce8da95..a22d39a 100644
--- a/src/function/sync/apply-actions/dispatch-parent-action/index.ts
+++ b/src/function/sync/apply-actions/dispatch-parent-action/index.ts
@@ -150,6 +150,8 @@ export const dispatchParentAction = async ({
     return dispatchUpdateCategoryBlockedTimes({ action, cache, fromChildSelfLimitAddChildUserId })
   } else if (action instanceof UpdateCategoryDisableLimitsAction) {
     return dispatchUpdateCategoryDisableLimits({ action, cache, fromChildSelfLimitAddChildUserId })
+  } else if (action instanceof UpdateTimelimitRuleAction) {
+    return dispatchUpdateTimelimitRule({ action, cache, fromChildSelfLimitAddChildUserId })
   }
 
   if (fromChildSelfLimitAddChildUserId !== null) {
@@ -211,8 +213,6 @@ export const dispatchParentAction = async ({
       return dispatchUpdateNetworkTimeVerification({ action, cache })
     } else if (action instanceof UpdateParentNotificationFlagsAction) {
       return dispatchUpdateParentNotificationFlags({ action, cache })
-    } else if (action instanceof UpdateTimelimitRuleAction) {
-      return dispatchUpdateTimelimitRule({ action, cache })
     } else if (action instanceof RemoveUserAction) {
       return dispatchRemoveUser({ action, cache, parentUserId })
     } else if (action instanceof ReportU2fLoginAction) {
diff --git a/src/function/sync/apply-actions/dispatch-parent-action/updatetimelimitrule.ts b/src/function/sync/apply-actions/dispatch-parent-action/updatetimelimitrule.ts
index dfe26e9..a39a026 100644
--- a/src/function/sync/apply-actions/dispatch-parent-action/updatetimelimitrule.ts
+++ b/src/function/sync/apply-actions/dispatch-parent-action/updatetimelimitrule.ts
@@ -17,11 +17,17 @@
 
 import { UpdateTimelimitRuleAction } from '../../../../action'
 import { Cache } from '../cache'
-import { MissingRuleException } from '../exception/missing-item'
+import { MissingRuleException, MissingCategoryException } from '../exception/missing-item'
+import {
+  CanNotModifyOtherUsersBySelfLimitationException, CanNotRelaxRestrictionsSelfLimitException
+} from '../exception/self-limit'
 
-export async function dispatchUpdateTimelimitRule ({ action, cache }: {
+export async function dispatchUpdateTimelimitRule ({
+  action, cache, fromChildSelfLimitAddChildUserId
+}: {
   action: UpdateTimelimitRuleAction
   cache: Cache
+  fromChildSelfLimitAddChildUserId: string | null
 }) {
   const ruleEntry = await cache.database.timelimitRule.findOne({
     where: {
@@ -35,6 +41,53 @@ export async function dispatchUpdateTimelimitRule ({ action, cache }: {
     throw new MissingRuleException()
   }
 
+  if (fromChildSelfLimitAddChildUserId != null) {
+    const categoryEntryUnsafe = await cache.database.category.findOne({
+      where: {
+        familyId: cache.familyId,
+        categoryId: ruleEntry.categoryId
+      },
+      transaction: cache.transaction,
+      attributes: ['childId']
+    })
+
+    if (!categoryEntryUnsafe) {
+      throw new MissingCategoryException()
+    }
+
+    const categoryEntry = {
+      childId: categoryEntryUnsafe.childId
+    }
+
+
+    if (fromChildSelfLimitAddChildUserId !== categoryEntry.childId) {
+      throw new CanNotModifyOtherUsersBySelfLimitationException()
+    }
+
+    const wasSessionDurationLimitationEnabled =
+      ruleEntry.sessionPauseMilliseconds > 0 && ruleEntry.sessionDurationMilliseconds > 0
+
+    const countOldAffectedDays = Array(7)
+      .fill(0)
+      .reduce((sum, _, index) => sum + ((ruleEntry.dayMaskAsBitmask >> index) & 1), 0)
+
+    const isAtLeastAsStrictAsPreviously =
+      action.maximumTimeInMillis <= ruleEntry.maximumTimeInMillis &&
+      (action.dayMask & ruleEntry.dayMaskAsBitmask) === ruleEntry.dayMaskAsBitmask &&
+      (action.applyToExtraTimeUsage || !ruleEntry.applyToExtraTimeUsage) &&
+      action.start <= ruleEntry.startMinuteOfDay &&
+      action.end >= ruleEntry.endMinuteOfDay &&
+      (!wasSessionDurationLimitationEnabled || (
+          action.sessionDurationMilliseconds <= ruleEntry.sessionDurationMilliseconds &&
+          action.sessionPauseMilliseconds >= ruleEntry.sessionPauseMilliseconds
+      )) &&
+      (!action.perDay || ruleEntry.perDay || countOldAffectedDays <= 1)
+
+    if (!isAtLeastAsStrictAsPreviously) {
+      throw new CanNotRelaxRestrictionsSelfLimitException()
+    }
+  }
+
   ruleEntry.applyToExtraTimeUsage = action.applyToExtraTimeUsage
   ruleEntry.dayMaskAsBitmask = action.dayMask
   ruleEntry.maximumTimeInMillis = action.maximumTimeInMillis
diff --git a/src/function/sync/apply-actions/exception/self-limit.ts b/src/function/sync/apply-actions/exception/self-limit.ts
index f3b9241..809c527 100644
--- a/src/function/sync/apply-actions/exception/self-limit.ts
+++ b/src/function/sync/apply-actions/exception/self-limit.ts
@@ -1,6 +1,6 @@
 /*
  * server component for the TimeLimit App
- * Copyright (C) 2019 - 2020 Jonas Lochmann
+ * Copyright (C) 2019 - 2022 Jonas Lochmann
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as
@@ -32,3 +32,9 @@ export class ActionNotSupportedBySelfLimitationException extends SelfLimitationE
 }
 
 export class SelfLimitNotPossibleException extends SelfLimitationException {}
+
+export class CanNotRelaxRestrictionsSelfLimitException extends SelfLimitationException {
+  constructor () {
+    super({ staticMessage: 'can not relax restrictions with the self limitation' })
+  }
+}
diff --git a/src/function/sync/get-server-data-status/index.ts b/src/function/sync/get-server-data-status/index.ts
index 5d44e32..39182b8 100644
--- a/src/function/sync/get-server-data-status/index.ts
+++ b/src/function/sync/get-server-data-status/index.ts
@@ -59,7 +59,7 @@ export const generateServerDataStatus = async ({
       familyEntry.hasFullVersion ? parseInt(familyEntry.fullVersionUntil, 10) : 0
     ),
     message: await getStatusMessage({ database, transaction }) || undefined,
-    apiLevel: 6
+    apiLevel: 7
   }
 
   if (familyEntry.deviceListVersion !== clientStatus.devices) {