Resolving dependencies... cabal: Could not resolve dependencies: [__0] trying: magicbane-0.5.1 (user goal) [__1] trying: wai-middleware-metrics-0.2.4 (dependency of magicbane) [__2] trying: time-1.9.3/installed-1.9.3 (dependency of wai-middleware-metrics) [__3] trying: servant-server-0.18.1 (dependency of magicbane) [__4] trying: wai-app-static-3.1.7.2 (dependency of servant-server) [__5] trying: template-haskell-2.16.0.0/installed-2.16.0.0 (dependency of wai-app-static) [__6] trying: pretty-1.1.3.6/installed-1.1.3.6 (dependency of template-haskell) [__7] next goal: ekg-wai (dependency of magicbane) [__7] rejecting: ekg-wai-0.1.0.3 (conflict: time==1.9.3/installed-1.9.3, ekg-wai => time<1.9) [__7] skipping: ekg-wai-0.1.0.2, ekg-wai-0.1.0.1, ekg-wai-0.1.0.0 (has the same characteristics that caused the previous version to fail: excludes 'time' version 1.9.3) [__7] fail (backjumping, conflict set: ekg-wai, magicbane, time) After searching the rest of the dependency tree exhaustively, these were the goals I've had most trouble fulfilling: template-haskell, wai-app-static, pretty, servant-server, time, base, magicbane, ekg-wai, wai-middleware-metrics Try running with --minimize-conflict-set to improve the error message.