diff --git a/requirements_dev.txt b/requirements_dev.txt
index 1d18132..7db2850 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -9,7 +9,7 @@ pytest==6.0.1
 pytest-cov==2.10.0
 pytest-sugar==0.9.4
 coveralls==2.1.1
-ase==3.19.2
+ase==3.20.0
 git+https://github.com/atomistic-machine-learning/schnetpack.git
 sphinx==3.1.2
 sphinx-rtd-theme==0.5.0