Resolving dependencies... cabal: Could not resolve dependencies: [__0] trying: bizzlelude-1.7.0 (user goal) [__1] next goal: text (dependency of bizzlelude) [__1] rejecting: text-1.2.3.1/installed-1.2.3.1 (conflict: bizzlelude => text>=1.2.4 && <1.3.0) [__1] trying: text-1.2.4.0 [__2] trying: base-4.12.0.0/installed-4.12.0.0 (dependency of text) [__3] next goal: base-noprelude (dependency of bizzlelude) [__3] rejecting: base-noprelude-4.13.0.0 (conflict: base==4.12.0.0/installed-4.12.0.0, base-noprelude => base==4.13.0.0) [__3] rejecting: base-noprelude-4.12.0.0 (conflict: bizzlelude => base-noprelude>=4.13 && <5) [__3] skipping: base-noprelude-4.11.1.0, base-noprelude-4.11.0.0, base-noprelude-4.10.1.0, base-noprelude-4.10.0.0, base-noprelude-4.9.1.0, base-noprelude-4.9.0.0, base-noprelude-4.8.2.0, base-noprelude-4.8.1.0, base-noprelude-4.8.0.0, base-noprelude-4.7.0.2, base-noprelude-4.7.0.1, base-noprelude-4.7.0.0, base-noprelude-4.6.0.1, base-noprelude-4.6.0.0, base-noprelude-4.5.1.0, base-noprelude-4.5.0.0, base-noprelude-4.3.1.0, base-noprelude-4.3.0.0 (has the same characteristics that caused the previous version to fail: excluded by constraint '>=4.13 && <5' from 'bizzlelude') [__3] fail (backjumping, conflict set: base, base-noprelude, bizzlelude) After searching the rest of the dependency tree exhaustively, these were the goals I've had most trouble fulfilling: bizzlelude, base, base-noprelude, text Try running with --minimize-conflict-set to improve the error message.