diff --git a/requirements.txt b/requirements.txt
index 33754585..ee7275c9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,5 +6,5 @@ photutils==1.9.0
 poppy>=1.0.0
 pysiaf==0.21.0
 scipy==1.11.3
-synphot==1.2.1
+synphot==1.3.post0
 astroquery==0.4.6