diff --git a/requirements-test.txt b/requirements-test.txt
index 8648b707..a8c34e77 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -2,3 +2,4 @@ biopython==1.81
 pytest==7.2.2
 requests==2.31.0
 pandas==2.2.3
+dendropy==5.0.1