Do not pin astropy bugfix version
@@ -34,7 +34,7 @@ deps =
# minimum numpy to 1.15. mpl while not a dependency, it's required for the
# tests, and would pull up a newer numpy version if not pinned.
- oldestdeps: astropy==4.0.6
+ oldestdeps: astropy==4.0
oldestdeps: numpy==1.16
oldestdeps: matplotlib==3.3.*
cov: codecov
