diff --git a/hasql-pool.cabal b/hasql-pool.cabal
--- a/hasql-pool.cabal
+++ b/hasql-pool.cabal
@@ -1,7 +1,7 @@
 name:
   hasql-pool
 version:
-  0.5.0.2
+  0.5.1
 category:
   Hasql, Database, PostgreSQL
 synopsis:
@@ -50,7 +50,7 @@
     -- resources:
     resource-pool >= 0.2 && < 0.3,
     -- database:
-    hasql >= 1.3 && < 1.4,
+    hasql >= 1.3 && < 1.5,
     -- data:
     time >= 1.5 && < 2,
     -- general:
diff --git a/library/Hasql/Pool.hs b/library/Hasql/Pool.hs
--- a/library/Hasql/Pool.hs
+++ b/library/Hasql/Pool.hs
@@ -20,6 +20,7 @@
 -- A pool of connections to DB.
 newtype Pool =
   Pool (ResourcePool.Pool (Either Hasql.Connection.ConnectionError Hasql.Connection.Connection))
+  deriving (Show)
 
 -- |
 -- Settings of the connection pool. Consist of: