diff --git a/speedy-slice.cabal b/speedy-slice.cabal
--- a/speedy-slice.cabal
+++ b/speedy-slice.cabal
@@ -1,5 +1,5 @@
 name:                speedy-slice
-version:             0.1.4
+version:             0.1.5
 synopsis:            Speedy slice sampling.
 homepage:            http://github.com/jtobin/speedy-slice
 license:             MIT
@@ -45,11 +45,11 @@
   build-depends:
       base            >= 4 && < 6
     , lens            >= 4 && < 5
-    , primitive
+    , primitive       >= 0.6 && < 1.0
     , mcmc-types      >= 1.0.1
     , mwc-probability >= 1.0.1
     , pipes           >= 4 && < 5
-    , transformers
+    , transformers    >= 0.5 && < 1.0
 
 Test-suite rosenbrock
   type:                exitcode-stdio-1.0