diff --git a/installation/caddyfile-pleroma.example b/installation/caddyfile-pleroma.example
index 29496d1d7..2c1efde2d 100644
--- a/installation/caddyfile-pleroma.example
+++ b/installation/caddyfile-pleroma.example
@@ -22,7 +22,7 @@ social.domain.tld  {
     Referrer-Policy "same-origin"
     Strict-Transport-Security "max-age=31536000; includeSubDomains;"
     Expect-CT "enforce, max-age=2592000"
-    Content-Security-Policy "default-src 'none'; base-uri 'self'; form-action 'self'; img-src 'self' data: https:; media-src 'self' https:; style-src 'self' 'unsafe-inline'; font-src 'self'; script-src 'self'; connect-src 'self' wss://social.domain.tld; upgrade-insecure-requests;"
+    Content-Security-Policy "default-src 'none'; base-uri 'self'; form-action 'self'; frame-ancestors 'none'; img-src 'self' data: https:; media-src 'self' https:; style-src 'self' 'unsafe-inline'; font-src 'self'; script-src 'self'; connect-src 'self' wss://social.domain.tld; upgrade-insecure-requests;"
   }
 
   # If you do not want remote frontends to be able to access your Pleroma backend server, remove these lines.
diff --git a/installation/pleroma-apache.conf b/installation/pleroma-apache.conf
index bf8db63ad..c70d52138 100644
--- a/installation/pleroma-apache.conf
+++ b/installation/pleroma-apache.conf
@@ -37,7 +37,7 @@ CustomLog ${APACHE_LOG_DIR}/access.log combined
     Header always set X-Frame-Options "DENY"
     Header always set X-Content-Type-Options "nosniff"
     Header always set Referrer-Policy same-origin
-    Header always set Content-Security-Policy "default-src 'none'; base-uri 'self'; form-action 'self'; img-src 'self' data: https:; media-src 'self' https:; style-src 'self' 'unsafe-inline'; font-src 'self'; script-src 'self'; connect-src 'self' wss://pleroma.example.tld; upgrade-insecure-requests;"
+    Header always set Content-Security-Policy "default-src 'none'; base-uri 'self'; form-action 'self'; frame-ancestors 'none'; img-src 'self' data: https:; media-src 'self' https:; style-src 'self' 'unsafe-inline'; font-src 'self'; script-src 'self'; connect-src 'self' wss://pleroma.example.tld; upgrade-insecure-requests;"
 
     # Uncomment this only after you get HTTPS working.
     # Header always set Strict-Transport-Security "max-age=31536000; includeSubDomains"
diff --git a/installation/pleroma.nginx b/installation/pleroma.nginx
index aaf620de2..37871ea5b 100644
--- a/installation/pleroma.nginx
+++ b/installation/pleroma.nginx
@@ -77,7 +77,7 @@ server {
         add_header X-Content-Type-Options "nosniff" always;
         add_header Referrer-Policy "same-origin" always;
         add_header X-Download-Options "noopen" always;
-        add_header Content-Security-Policy "default-src 'none'; base-uri 'self'; form-action 'self'; img-src 'self' data: https:; media-src 'self' https:; style-src 'self' 'unsafe-inline'; font-src 'self'; script-src 'self'; connect-src 'self' wss://example.tld; upgrade-insecure-requests;" always;
+        add_header Content-Security-Policy "default-src 'none'; base-uri 'self'; form-action 'self'; frame-ancestors 'none'; img-src 'self' data: https:; media-src 'self' https:; style-src 'self' 'unsafe-inline'; font-src 'self'; script-src 'self'; connect-src 'self' wss://example.tld; upgrade-insecure-requests;" always;
         
         # Uncomment this only after you get HTTPS working.
         # add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
diff --git a/installation/pleroma.vcl b/installation/pleroma.vcl
index ad5bb3c6c..74490be2a 100644
--- a/installation/pleroma.vcl
+++ b/installation/pleroma.vcl
@@ -125,7 +125,7 @@ sub vcl_deliver {
   set resp.http.X-XSS-Protection = "1; mode=block";
   set resp.http.X-Content-Type-Options = "nosniff";
   set resp.http.Referrer-Policy = "same-origin";
-  set resp.http.Content-Security-Policy = "default-src 'none'; base-uri 'self'; form-action 'self'; img-src 'self' data: https:; media-src 'self' https:; style-src 'self' 'unsafe-inline'; font-src 'self'; script-src 'self'; connect-src 'self' wss://" + req.http.host + "; upgrade-insecure-requests;";
+  set resp.http.Content-Security-Policy = "default-src 'none'; base-uri 'self'; form-action 'self'; frame-ancestors 'none'; img-src 'self' data: https:; media-src 'self' https:; style-src 'self' 'unsafe-inline'; font-src 'self'; script-src 'self'; connect-src 'self' wss://" + req.http.host + "; upgrade-insecure-requests;";
   # Uncomment this only after you get HTTPS working.
   # set resp.http.Strict-Transport-Security= "max-age=31536000; includeSubDomains";
-}
\ No newline at end of file
+}