diff --git a/CHANGELOG.md b/CHANGELOG.md
index 71bcf1d..0b7ea84 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -26,6 +26,7 @@ and this project adheres to
 ### Fixed
 
 - 💚(docker) vendor mime.types file instead of fetching from Apache SVN
+- 🚑️(back) fix mime type for pptx
 - 🐛(front) fix math formulas and carousel translations
 - 🐛(helm) reverse liveness and readiness for backend deployment
 - 🐛(front) fix dark mode styling on chat messages
diff --git a/src/backend/conversations/settings.py b/src/backend/conversations/settings.py
index df87739..d1ccb43 100755
--- a/src/backend/conversations/settings.py
+++ b/src/backend/conversations/settings.py
@@ -702,7 +702,7 @@ class Base(BraveSettings, Configuration):
             # docx files
             "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
             # pptx files
-            "application/vnd.openxmlformats-officedocument.presentationml",
+            "application/vnd.openxmlformats-officedocument.presentationml.presentation",
             # xlsx and xls files
             "application/vnd.ms-excel",
             "application/excel",
diff --git a/src/frontend/apps/e2e/__tests__/app-conversations/common.ts b/src/frontend/apps/e2e/__tests__/app-conversations/common.ts
index 13f206f..69dc0ab 100644
--- a/src/frontend/apps/e2e/__tests__/app-conversations/common.ts
+++ b/src/frontend/apps/e2e/__tests__/app-conversations/common.ts
@@ -26,7 +26,7 @@ export const CONFIG = {
   theme_customization: {},
   chat_upload_accept:
     'application/vnd.openxmlformats-officedocument.wordprocessingml.document,' +
-    'application/vnd.openxmlformats-officedocument.presentationml,' +
+    'application/vnd.openxmlformats-officedocument.presentationml.presentation,' +
     'application/vnd.ms-excel,' +
     'application/excel,' +
     'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet,' +