diff --git a/setup.cfg b/setup.cfg
index a82ad57..1ba45f9 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -32,7 +32,7 @@ setup_requires =
   tqdm ~=4.41
 install_requires =
   better-exceptions ~=0.2.2
-  biopython ~=1.73
+  biopython ~=1.73, <1.78
   coloredlogs ~=14.0
   dataclasses ~=0.7             ; python_version < '3.7'
   docopt ~=0.6.2