diff --git a/src/lib/__snapshots__/create-config.test.ts.snap b/src/lib/__snapshots__/create-config.test.ts.snap
index 59a28fd6e8..0e40bd6a30 100644
--- a/src/lib/__snapshots__/create-config.test.ts.snap
+++ b/src/lib/__snapshots__/create-config.test.ts.snap
@@ -103,7 +103,6 @@ exports[`should create default config 1`] = `
       "privateProjects": false,
       "proPlanAutoCharge": false,
       "responseTimeWithAppNameKillSwitch": false,
-      "slackAppAddon": false,
       "strictSchemaValidation": false,
       "variantTypeNumber": false,
     },
@@ -142,7 +141,6 @@ exports[`should create default config 1`] = `
       "privateProjects": false,
       "proPlanAutoCharge": false,
       "responseTimeWithAppNameKillSwitch": false,
-      "slackAppAddon": false,
       "strictSchemaValidation": false,
       "variantTypeNumber": false,
     },
diff --git a/src/lib/addons/addon-schema.ts b/src/lib/addons/addon-schema.ts
index dd7b4dcbe6..1e3e0b212e 100644
--- a/src/lib/addons/addon-schema.ts
+++ b/src/lib/addons/addon-schema.ts
@@ -9,7 +9,7 @@ export const addonDefinitionSchema = joi.object().keys({
     documentationUrl: joi.string().uri({ scheme: [/https?/] }),
     description: joi.string().allow(''),
     howTo: joi.string().optional().allow(''),
-    deprecated: joi.boolean().optional().default(false),
+    deprecated: joi.string().optional().allow(''),
     parameters: joi
         .array()
         .optional()
diff --git a/src/lib/addons/index.ts b/src/lib/addons/index.ts
index c6376dcd8a..39b6d137ac 100644
--- a/src/lib/addons/index.ts
+++ b/src/lib/addons/index.ts
@@ -5,7 +5,6 @@ import DatadogAddon from './datadog';
 import Addon from './addon';
 import { LogProvider } from '../logger';
 import SlackAppAddon from './slack-app';
-import { IFlagResolver } from '../types';
 
 export interface IAddonProviders {
     [key: string]: Addon;
@@ -14,28 +13,15 @@ export interface IAddonProviders {
 export const getAddons: (args: {
     getLogger: LogProvider;
     unleashUrl: string;
-    flagResolver: IFlagResolver;
-}) => IAddonProviders = ({ getLogger, unleashUrl, flagResolver }) => {
-    const slackAppAddonEnabled = flagResolver.isEnabled('slackAppAddon');
-
-    const slackAddon = new SlackAddon({ getLogger, unleashUrl });
-
-    if (slackAppAddonEnabled) {
-        slackAddon.definition.deprecated =
-            'This integration is deprecated. Please try the new Slack App integration instead.';
-    }
-
+}) => IAddonProviders = ({ getLogger, unleashUrl }) => {
     const addons: Addon[] = [
         new Webhook({ getLogger }),
-        slackAddon,
+        new SlackAddon({ getLogger, unleashUrl }),
+        new SlackAppAddon({ getLogger, unleashUrl }),
         new TeamsAddon({ getLogger, unleashUrl }),
         new DatadogAddon({ getLogger, unleashUrl, flagResolver }),
     ];
 
-    if (slackAppAddonEnabled) {
-        addons.push(new SlackAppAddon({ getLogger, unleashUrl }));
-    }
-
     return addons.reduce((map, addon) => {
         // eslint-disable-next-line no-param-reassign
         map[addon.name] = addon;
diff --git a/src/lib/addons/slack-definition.ts b/src/lib/addons/slack-definition.ts
index ebbec92969..e2407b7550 100644
--- a/src/lib/addons/slack-definition.ts
+++ b/src/lib/addons/slack-definition.ts
@@ -22,6 +22,8 @@ const slackDefinition: IAddonDefinition = {
     displayName: 'Slack',
     description: 'Allows Unleash to post updates to Slack.',
     documentationUrl: 'https://docs.getunleash.io/docs/addons/slack',
+    deprecated:
+        'This integration is deprecated. Please try the new Slack App integration instead.',
     alerts: [
         {
             type: 'warning',
diff --git a/src/lib/services/addon-service.ts b/src/lib/services/addon-service.ts
index 3105d321a9..3b4599c0c7 100644
--- a/src/lib/services/addon-service.ts
+++ b/src/lib/services/addon-service.ts
@@ -49,11 +49,7 @@ export default class AddonService {
             IUnleashStores,
             'addonStore' | 'eventStore' | 'featureToggleStore'
         >,
-        {
-            getLogger,
-            server,
-            flagResolver,
-        }: Pick<IUnleashConfig, 'getLogger' | 'server' | 'flagResolver'>,
+        { getLogger, server }: Pick<IUnleashConfig, 'getLogger' | 'server'>,
         tagTypeService: TagTypeService,
         addons?: IAddonProviders,
     ) {
@@ -68,7 +64,6 @@ export default class AddonService {
             getAddons({
                 getLogger,
                 unleashUrl: server.unleashUrl,
-                flagResolver,
             });
         this.sensitiveParams = this.loadSensitiveParams(this.addonProviders);
         if (addonStore) {
diff --git a/src/lib/types/experimental.ts b/src/lib/types/experimental.ts
index d7dd19770f..907989dd49 100644
--- a/src/lib/types/experimental.ts
+++ b/src/lib/types/experimental.ts
@@ -20,7 +20,6 @@ export type IFlagKey =
     | 'disableBulkToggle'
     | 'disableNotifications'
     | 'advancedPlayground'
-    | 'slackAppAddon'
     | 'filterInvalidClientMetrics'
     | 'lastSeenByEnvironment'
     | 'customRootRolesKillSwitch'
@@ -99,10 +98,6 @@ const flags: IFlags = {
         process.env.DISABLE_NOTIFICATIONS,
         false,
     ),
-    slackAppAddon: parseEnvVarBoolean(
-        process.env.UNLEASH_SLACK_APP_ADDON,
-        false,
-    ),
     filterInvalidClientMetrics: parseEnvVarBoolean(
         process.env.FILTER_INVALID_CLIENT_METRICS,
         false,
diff --git a/src/server-dev.ts b/src/server-dev.ts
index 41e7ed2177..730e3ac25b 100644
--- a/src/server-dev.ts
+++ b/src/server-dev.ts
@@ -37,7 +37,6 @@ process.nextTick(async () => {
                         embedProxyFrontend: true,
                         anonymiseEventLog: false,
                         responseTimeWithAppNameKillSwitch: false,
-                        slackAppAddon: true,
                         lastSeenByEnvironment: true,
                         featureNamingPattern: true,
                         doraMetrics: true,
diff --git a/src/test/e2e/api/admin/addon.e2e.test.ts b/src/test/e2e/api/admin/addon.e2e.test.ts
index 5ead1b23dd..595de3cf21 100644
--- a/src/test/e2e/api/admin/addon.e2e.test.ts
+++ b/src/test/e2e/api/admin/addon.e2e.test.ts
@@ -13,7 +13,6 @@ beforeAll(async () => {
         experimental: {
             flags: {
                 strictSchemaValidation: true,
-                slackAppAddon: true,
             },
         },
     });