diff --git a/galaxy_mergers/requirements.txt b/galaxy_mergers/requirements.txt
index 5b1d3f2..aeaa009 100644
--- a/galaxy_mergers/requirements.txt
+++ b/galaxy_mergers/requirements.txt
@@ -1,5 +1,5 @@
 absl-py==0.11.0
-astropy==4.2
+astropy==5.3.3
 astunparse==1.6.3
 cachetools==4.2.1
 certifi==2020.12.5