diff --git a/ariba/versions.py b/ariba/versions.py
index 7baca6a6..d4a3eb6d 100644
--- a/ariba/versions.py
+++ b/ariba/versions.py
@@ -5,6 +5,7 @@
 
 
 package_min_versions = {
+    'dendropy': '4.1.0',
     'openpyxl': '1.6.2',
     'pyfastaq': '3.12.0',
     'pysam': '0.8.1',
@@ -31,7 +32,7 @@ def get_all_versions(raise_error=True):
 
     python_packages_ok = True
 
-    for package in ['ariba', 'openpyxl', 'pyfastaq', 'pymummer', 'pysam']:
+    for package in ['ariba', 'dendropy', 'openpyxl', 'pyfastaq', 'pymummer', 'pysam']:
         try:
             exec('import ' + package)
             version = eval(package + '.__version__')