diff --git a/requirements.txt b/requirements.txt
index 35b162ca..4b2a8693 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,5 +6,5 @@ photutils>=1.13.0,<2.1.0
 poppy>=1.0.0
 pysiaf>=0.22.0,<0.24.0
 scipy>=1.14.0,<1.15.0
-synphot>=1.4.0,<1.5.0
+synphot>=1.4.0,<1.6.0
 astroquery>=0.4.7,<0.5.0