diff --git a/requirements.txt b/requirements.txt
index d6a9388..37124ef 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,4 +3,5 @@ setuptools >= 41
 opencv-python-headless
 ocrd >= 2.18.0
 keras >= 2.3.1, < 2.4
+h5py < 3
 tensorflow >= 1.15, < 1.16