diff --git a/opm/requirements.txt b/opm/requirements.txt
index 3b5b176..3950828 100644
--- a/opm/requirements.txt
+++ b/opm/requirements.txt
@@ -1,7 +1,7 @@
 2to3==1.0
 #3to2==1.1.1
 argcomplete==1.10.0
-astropy==4.0
+astropy==5.3.3
 attrs==19.3.0
 aylien-apiclient==0.7.0
 backcall==0.1.0