diff --git a/malariagen_data/anopheles.py b/malariagen_data/anopheles.py
index 26d7975a1..2c9ff9972 100644
--- a/malariagen_data/anopheles.py
+++ b/malariagen_data/anopheles.py
@@ -1857,6 +1857,8 @@ def plot_haplotype_network(
             boxSelectionEnabled=True,
             # prevent accidentally zooming out to oblivion
             minZoom=0.1,
+            # lower scroll wheel zoom sensitivity to prevent accidental zooming when trying to navigate large graphs
+            wheelSensitivity=0.1,
         )
 
         debug("create dash app")