diff --git a/wrap/python/tests/ipnbdoctest.py b/wrap/python/tests/ipnbdoctest.py
index 4f399b10d..d4e828d90 100755
--- a/wrap/python/tests/ipnbdoctest.py
+++ b/wrap/python/tests/ipnbdoctest.py
@@ -67,6 +67,9 @@ def sanitize(s):
     # normalize UUIDs:
     s = re.sub(r'[a-f0-9]{8}(\-[a-f0-9]{4}){3}\-[a-f0-9]{12}', 'U-U-I-D', s)
 
+    # normalize graphviz version
+    s = re.sub(r'Generated by graphviz version.*', 'VERSION', s)
+
     # SVG generated by graphviz may put note at different positions
     # depending on the graphviz build.  Let's just strip anything that
     # look like a position.