diff --git a/public/static/onlyOffice/editor.html b/public/static/onlyOffice/editor.html
index d721b4178..ac96ca23f 100644
--- a/public/static/onlyOffice/editor.html
+++ b/public/static/onlyOffice/editor.html
@@ -1,6 +1,8 @@
 <!DOCTYPE html>
 <html style="height: 100%">
 <head id="vue">
+    <meta charset="utf-8" http-equiv="Content-Security-Policy" content="upgrade-insecure-requests">
+
     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
     <meta name="viewport"
           content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no, minimal-ui"/>
diff --git a/public/static/onlyOffice/onlinePreview.html b/public/static/onlyOffice/onlinePreview.html
index 5d1a30663..cc21a7e4a 100644
--- a/public/static/onlyOffice/onlinePreview.html
+++ b/public/static/onlyOffice/onlinePreview.html
@@ -1,6 +1,7 @@
 <!DOCTYPE html>
 <html style="height: 100%">
 <head id="vue">
+    <meta charset="utf-8" http-equiv="Content-Security-Policy" content="upgrade-insecure-requests">
     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
     <meta name="viewport"
           content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no, minimal-ui"/>
