Resolving dependencies... cabal: Could not resolve dependencies: [__0] trying: logging-effect-extra-2.0.0 (user goal) [__1] next goal: logging-effect-extra-handler (dependency of logging-effect-extra) [__1] rejecting: logging-effect-extra-handler-1.1.4, logging-effect-extra-handler-1.1.3, logging-effect-extra-handler-1.1.2, logging-effect-extra-handler-1.1.1, logging-effect-extra-handler-1.1.0, logging-effect-extra-handler-1.0.0 (conflict: logging-effect-extra => logging-effect-extra-handler>=2.0.0 && <2.1.0) After searching the rest of the dependency tree exhaustively, these were the goals I've had most trouble fulfilling: logging-effect-extra, logging-effect-extra-handler