diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@
 ## Other packages
 
 An alternative package is already available, namely
-  [partial-order](https://hackage.haskell.org/package/partial-order-0.2.0.0/docs/Data-PartialOrd.html).
+  [partial-order](https://hackage.haskell.org/package/partial-order).
 Differences include:
 * PartialOrd has a comparison valued in Maybe Ordering; we use a fresh
   type.
diff --git a/partialord.cabal b/partialord.cabal
--- a/partialord.cabal
+++ b/partialord.cabal
@@ -5,7 +5,7 @@
 -- see: https://github.com/sol/hpack
 
 name:           partialord
-version:        0.0.0
+version:        0.0.1
 synopsis:       Data structure supporting partial orders
 description:    Please see README.md
 category:       Data structures
@@ -37,7 +37,7 @@
   ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints
   build-depends:
       base >=4.7 && <5
-    , containers ==0.6.*
+    , containers >=0.6 && <0.8
   default-language: Haskell2010
 
 test-suite partialord-test
@@ -53,7 +53,7 @@
   ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints -threaded -rtsopts -with-rtsopts=-N
   build-depends:
       base >=4.7 && <5
-    , containers ==0.6.*
+    , containers >=0.6 && <0.8
     , hspec >=2.7 && <2.12
     , partialord
   default-language: Haskell2010