diff --git a/packages/mermaid/src/docs/ecosystem/tutorials.md b/packages/mermaid/src/docs/ecosystem/tutorials.md
index d5bf9330d..7258361bf 100644
--- a/packages/mermaid/src/docs/ecosystem/tutorials.md
+++ b/packages/mermaid/src/docs/ecosystem/tutorials.md
@@ -57,7 +57,7 @@ import matplotlib.pyplot as plt
 
 def mm(graph):
     graphbytes = graph.encode("utf8")
-    base64_bytes = base64.b64encode(graphbytes)
+    base64_bytes = base64.urlsafe_b64encode(graphbytes)
     base64_string = base64_bytes.decode("ascii")
     display(Image(url="https://mermaid.ink/img/" + base64_string))