diff --git a/opaleye-trans.cabal b/opaleye-trans.cabal
--- a/opaleye-trans.cabal
+++ b/opaleye-trans.cabal
@@ -1,5 +1,5 @@
 name:                opaleye-trans
-version:             0.3.0
+version:             0.3.1
 synopsis:            A monad transformer for Opaleye
 description:         A monad transformer for Opaleye
 homepage:            https://github.com/tomjaguarpaw/haskell-opaleye
@@ -27,7 +27,7 @@
     transformers        >=0.3 && <0.5,
     transformers-base   >=0.4 && <0.5,
     opaleye             >=0.4 && <0.5,
-    postgresql-simple   >=0.4 && <0.5,
+    postgresql-simple   >=0.4 && <0.6,
     product-profunctors >=0.6 && <0.7
 
 executable opaleye-rosetree
@@ -37,7 +37,7 @@
   build-depends:
     base                >=4.8 && <4.9,
     opaleye             >=0.4 && <0.5,
-    postgresql-simple   >=0.4 && <0.5,
+    postgresql-simple   >=0.4 && <0.6,
     product-profunctors >=0.6 && <0.7,
     opaleye-trans
 
@@ -48,6 +48,6 @@
   build-depends:
     base                >=4.8 && <4.9,
     opaleye             >=0.4 && <0.5,
-    postgresql-simple   >=0.4 && <0.5,
+    postgresql-simple   >=0.4 && <0.6,
     product-profunctors >=0.6 && <0.7,
     opaleye-trans