diff --git a/peregrin.cabal b/peregrin.cabal
--- a/peregrin.cabal
+++ b/peregrin.cabal
@@ -1,6 +1,6 @@
 Cabal-version:       2.2
 Name:                peregrin
-Version:             0.3.1
+Version:             0.3.2
 Synopsis:            Database migration support for use in other libraries.
 Description:         Database migration support for use in other libraries.
                      Currently only supports PostgreSQL.
@@ -17,7 +17,7 @@
 
 Library
   build-depends:      base >= 4.9 && < 5
-                    , bytestring >= 0.10 && < 0.11
+                    , bytestring >= 0.10 && < 0.12
                     , postgresql-simple >= 0.5.2.1 && < 0.7
                     , text >= 1.1.0 && < 2
   default-language:   Haskell2010
diff --git a/src-test/Main.hs b/src-test/Main.hs
--- a/src-test/Main.hs
+++ b/src-test/Main.hs
@@ -3,16 +3,19 @@
 
 import           Control.Applicative ((<$>))
 import           Database.PeregrinSpec ( mkMigrateSpec )
+import           Data.Maybe (fromMaybe)
 import           Data.Pool (createPool)
 import qualified Database.PostgreSQL.Harness.Client as H
 import           Database.PostgreSQL.Simple (connectPostgreSQL, close)
+import           System.Environment (lookupEnv)
 import           Test.Hspec
 
 main :: IO ()
 main = do
-  -- HSpec has no easy way to get "other" command line parameters, so
-  -- we'll just settle for a hardcoded value here.
-  let url = "http://localhost:8900"
+  -- We require an environment variable to point to a tempgres server instance.
+  url <- fmap
+    (fromMaybe (error "Missing TEMPGRES_URL environment variable"))
+    (lookupEnv "TEMPGRES_URL")
   -- Connection pool creation function. We use a fresh temporary
   -- database for every connection pool.
   let mkConnectionPool = do
diff --git a/src/Database/Peregrin.hs b/src/Database/Peregrin.hs
--- a/src/Database/Peregrin.hs
+++ b/src/Database/Peregrin.hs
@@ -7,7 +7,6 @@
     , QP(..)
     ) where
 
-import           Control.Applicative ((<$>))
 import           Control.Exception (Exception, throwIO)
 import           Control.Monad (forM_, when, void)
 import           Data.ByteString (ByteString)