diff --git a/hasql.cabal b/hasql.cabal
index 902c4f9..2d6eaf8 100644
--- a/hasql.cabal
+++ b/hasql.cabal
@@ -1,7 +1,7 @@
 name:
   hasql
 version:
-  0.19
+  0.19.1
 category:
   Hasql, Database, PostgreSQL
 synopsis:
diff --git a/library/Hasql/Private/Session.hs b/library/Hasql/Private/Session.hs
index 09d0ac8..a87a17f 100644
--- a/library/Hasql/Private/Session.hs
+++ b/library/Hasql/Private/Session.hs
@@ -14,7 +14,7 @@ import qualified Hasql.Private.Connection as Connection
 -- A batch of actions to be executed in the context of a database connection.
 newtype Session a =
   Session (ReaderT Connection.Connection (EitherT Error IO) a)
-  deriving (Functor, Applicative, Monad, MonadError Error)
+  deriving (Functor, Applicative, Monad, MonadError Error, MonadIO)
 
 -- |
 -- Executes a bunch of commands on the provided connection.