diff --git a/cblrepo.cabal b/cblrepo.cabal
--- a/cblrepo.cabal
+++ b/cblrepo.cabal
@@ -1,5 +1,5 @@
 name: cblrepo
-version: 0.22.0
+version: 0.23.0
 cabal-version: >= 1.23
 license: OtherLicense
 license-file: LICENSE-2.0
@@ -64,7 +64,7 @@
                    ansi-wl-pprint ==0.6.*,
                    aeson ==0.11.*,
                    stringsearch ==0.3.*,
-                   optparse-applicative ==0.12.*,
+                   optparse-applicative ==0.13.*,
                    safe ==0.3.*,
                    containers ==0.5.*,
                    utf8-string ==1.0.*,
diff --git a/src/Main.hs b/src/Main.hs
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -34,6 +34,7 @@
 
 import Paths_cblrepo
 
+import Data.Monoid
 import Distribution.Text
 import Options.Applicative as OA
 import System.Directory