diff --git a/frontend/editor.css b/frontend/editor.css
index 858246812..550e52a2d 100644
--- a/frontend/editor.css
+++ b/frontend/editor.css
@@ -3767,9 +3767,9 @@ pluto-cell.hooked_up pluto-output {
 }
 
 .markdown-code-block-button::before {
-    background-image: url("https://unpkg.com/ionicons@7.1.0/dist/svg/copy-outline.svg");
+    background-image: url("https://cdn.jsdelivr.net/gh/ionic-team/ionicons@5.5.1/src/svg/copy-outline.svg");
 }
 
 .markdown-code-block-copied-code-button::before {
-    background-image: url("https://unpkg.com/ionicons@7.1.0/dist/svg/checkmark-outline.svg");
+    background-image: url("https://cdn.jsdelivr.net/gh/ionic-team/ionicons@5.5.1/src/svg/checkmark-outline.svg");
 }