diff --git a/Setup.hs b/Setup.hs
--- a/Setup.hs
+++ b/Setup.hs
@@ -1,4 +1,4 @@
-module Main(main)
+module Main ( main ) where
 
 import Distribution.Simple
 
diff --git a/opentheory-prime.cabal b/opentheory-prime.cabal
--- a/opentheory-prime.cabal
+++ b/opentheory-prime.cabal
@@ -1,5 +1,5 @@
 name: opentheory-prime
-version: 1.80
+version: 1.81
 category: Number Theory
 synopsis: Prime natural numbers
 license: MIT
@@ -10,16 +10,16 @@
 maintainer: Joe Leslie-Hurd <joe@gilith.com>
 description:
   Prime natural numbers - this package was automatically generated from the
-  OpenTheory package natural-prime-1.80
+  OpenTheory package natural-prime-1.81
 
 library
   build-depends:
     base >= 4.0 && < 5.0,
     QuickCheck >= 2.4.0.1 && < 3.0,
-    opentheory-primitive >= 1.4 && < 2.0,
-    opentheory >= 1.193 && < 1.197,
-    opentheory-divides >= 1.53 && < 1.57,
-    opentheory-stream >= 1.42 && < 1.44
+    opentheory-primitive >= 1.5 && < 2.0,
+    opentheory >= 1.193 && < 1.198,
+    opentheory-divides >= 1.53 && < 1.58,
+    opentheory-stream >= 1.42 && < 1.45
   hs-source-dirs: src
   ghc-options: -Wall
   exposed-modules:
@@ -31,10 +31,10 @@
   build-depends:
     base >= 4.0 && < 5.0,
     QuickCheck >= 2.4.0.1 && < 3.0,
-    opentheory-primitive >= 1.4 && < 2.0,
-    opentheory >= 1.193 && < 1.197,
-    opentheory-divides >= 1.53 && < 1.57,
-    opentheory-stream >= 1.42 && < 1.44
+    opentheory-primitive >= 1.5 && < 2.0,
+    opentheory >= 1.193 && < 1.198,
+    opentheory-divides >= 1.53 && < 1.58,
+    opentheory-stream >= 1.42 && < 1.45
   hs-source-dirs: src
   ghc-options: -Wall
   main-is: Test.hs