diff --git a/BattlePlace/WebApi/Types.hs b/BattlePlace/WebApi/Types.hs
--- a/BattlePlace/WebApi/Types.hs
+++ b/BattlePlace/WebApi/Types.hs
@@ -152,10 +152,10 @@
 type MatchTeamSize = Int
 
 -- | Match tag in match request.
-newtype MatchTag = MatchTag T.Text deriving (Eq, Hashable, Monoid, J.FromJSON, J.ToJSON)
+newtype MatchTag = MatchTag T.Text deriving (Eq, Hashable, Semigroup, Monoid, J.FromJSON, J.ToJSON)
 
 -- | Opaque player info.
-newtype MatchPlayerInfo = MatchPlayerInfo T.Text deriving (Monoid, J.FromJSON, J.ToJSON)
+newtype MatchPlayerInfo = MatchPlayerInfo T.Text deriving (Semigroup, Monoid, J.FromJSON, J.ToJSON)
 
 -- | Match token.
 data MatchToken = MatchToken
@@ -233,7 +233,7 @@
 base64ParseUrlPiece = either (Left . T.pack) (either (Left . T.pack) Right . S.decode) . BA.convertFromBase BA.Base64URLUnpadded . T.encodeUtf8
 
 -- | ByteString which serializes to JSON as base64 string.
-newtype Base64ByteString = Base64ByteString B.ByteString deriving (Eq, Ord, Monoid, Hashable, BA.ByteArray, BA.ByteArrayAccess)
+newtype Base64ByteString = Base64ByteString B.ByteString deriving (Eq, Ord, Semigroup, Monoid, Hashable, BA.ByteArray, BA.ByteArrayAccess)
 instance J.FromJSON Base64ByteString where
 	parseJSON = either fail return . BA.convertFromBase BA.Base64URLUnpadded . T.encodeUtf8 <=< J.parseJSON
 instance J.ToJSON Base64ByteString where
diff --git a/battleplace.cabal b/battleplace.cabal
--- a/battleplace.cabal
+++ b/battleplace.cabal
@@ -1,5 +1,5 @@
 name:                battleplace
-version:             0.1.0.2
+version:             0.1.0.3
 synopsis:            Core definitions for BattlePlace.io service
 description:         Core definitions for BattlePlace.io service
 license:             MIT
@@ -24,7 +24,7 @@
   other-modules:
   build-depends:
     aeson
-    , base >= 4.5 && < 5
+    , base >= 4.11 && < 5
     , bytestring
     , cereal
     , data-default