diff --git a/tox.ini b/tox.ini
index b8ad690a..7215363a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -29,7 +29,7 @@ deps =
     oldestdeps: astropy==5.3.0
     oldestdeps: photutils==2.0.0
     oldestdeps: astroquery==0.4.10
-    oldestdeps: firefly_client==3.2.0
+    oldestdeps: firefly_client==3.4.0
     oldestdeps: sep==1.4.0
     oldestdeps: pyvo==1.5.0
     oldestdeps: pandas==1.5.2