diff --git a/CHANGELOG.markdown b/CHANGELOG.markdown
--- a/CHANGELOG.markdown
+++ b/CHANGELOG.markdown
@@ -1,3 +1,8 @@
+/1.5.0.3/
+
+ * Support GHC 8
+ * Support `transformers` 0.5
+
 /1.5.0.2/
 
  * Build warning-free on GHC 7.10+
diff --git a/speculation.cabal b/speculation.cabal
--- a/speculation.cabal
+++ b/speculation.cabal
@@ -1,5 +1,5 @@
 name:           speculation
-version:        1.5.0.2
+version:        1.5.0.3
 license:        BSD3
 license-file:   LICENSE
 author:         Edward A. Kmett
@@ -86,8 +86,8 @@
 
   build-depends:
     ghc-prim,
-    transformers >= 0.2.2.0 && < 0.5,
-    stm          >= 2.1 && < 2.5
+    stm >= 2.1 && < 2.5,
+    transformers >= 0.2.2.0 && < 0.6
 
   exposed-modules:
     Control.Concurrent.Speculation
@@ -97,4 +97,3 @@
     Control.Concurrent.Speculation.List
   other-modules:
     Control.Concurrent.Speculation.Internal
-