diff --git a/langfuse/_client/client.py b/langfuse/_client/client.py
index 2837dcfef..8cbb604bc 100644
--- a/langfuse/_client/client.py
+++ b/langfuse/_client/client.py
@@ -2249,4 +2249,7 @@ def update_prompt(
         return updated_prompt
 
     def _url_encode(self, url: str) -> str:
-        return urllib.parse.quote(url)
+        # urllib.parse.quote does not escape slashes "/" by default; we need to add safe="" to force escaping
+        # we need add safe="" to force escaping of slashes
+        # This is necessary for prompts in prompt folders
+        return urllib.parse.quote(url, safe="")