diff --git a/setup.cfg b/setup.cfg
index ab357ffe..bd2112a1 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -2,6 +2,7 @@
 name = nionswift
 version = 16.11.0
 # nionui 7.2.0, timestamp_ns
+# TODO: RESTORE nionswift-io REQUIRED DEPENDENCY. removed to to unstick numpy/imageio/nionswift-io build dependency.
 author = Nion Software
 author_email = swift@nion.com
 description = Nion Swift: Scientific Image Processing.
@@ -30,7 +31,7 @@ install_requires =
     nionutils>=4.11.0,<5.0
     niondata>=15.6.2,<16.0
     nionui>=7.1.0,<8.0
-    nionswift-io>=15.2,<16.0
+#    nionswift-io>=15.2,<16.0
 
 [options.package_data]
 nion.swift =