diff --git a/docs/requirements.txt b/docs/requirements.txt
index ae1a5ad..5a91db0 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -2,6 +2,6 @@
 
 sphinx==3.5.3
 matplotlib==3.3.4
-astropy==4.2
+astropy==5.3.3
 specutils==1.2
 furo==2021.4.11b34