Resolving dependencies... Error: cabal: Could not resolve dependencies: [__0] trying: exploring-interpreters-1.5.0.1 (user goal) [__1] next goal: transformers (dependency of exploring-interpreters) [__1] rejecting: transformers-0.6.1.0/installed-0.6.1.0 (conflict: exploring-interpreters => transformers>=0.5.2 && <0.6) [__1] skipping: transformers-0.6.1.1, transformers-0.6.1.0, transformers-0.6.0.6, transformers-0.6.0.2 (has the same characteristics that caused the previous version to fail: excluded by constraint '>=0.5.2 && <0.6' from 'exploring-interpreters') [__1] trying: transformers-0.5.6.2 [__2] trying: base-4.18.1.0/installed-4.18.1.0 (dependency of exploring-interpreters) [__3] trying: aeson-2.2.1.0 (dependency of exploring-interpreters) [__4] trying: semialign-1.3 (dependency of aeson) [__5] trying: semialign:+semigroupoids [__6] next goal: semigroupoids (dependency of semialign +semigroupoids) [__6] rejecting: semigroupoids-6.0.0.1 (conflict: transformers==0.5.6.2, semigroupoids => transformers>=0.6.1.0 && <0.7) [__6] rejecting: semigroupoids-5.3.7 (conflict: base==4.18.1.0/installed-4.18.1.0, semigroupoids => base>=4.3 && <4.18) [__6] skipping: semigroupoids-5.3.6, semigroupoids-5.3.5, semigroupoids-5.3.4, semigroupoids-5.3.3, semigroupoids-5.3.2, semigroupoids-5.3.1, semigroupoids-5.2.2, semigroupoids-5.2.1, semigroupoids-5.2, semigroupoids-5.1, semigroupoids-5.0.1, semigroupoids-5.0.0.4, semigroupoids-5.0.0.3, semigroupoids-5.0.0.2, semigroupoids-5.0.0.1, semigroupoids-5 (has the same characteristics that caused the previous version to fail: excludes 'base' version 4.18.1.0) [__6] rejecting: semigroupoids-4.3, semigroupoids-4.2, semigroupoids-4.0.4, semigroupoids-4.0.3, semigroupoids-4.0.2.1, semigroupoids-4.0.2, semigroupoids-4.0.1, semigroupoids-4.0, semigroupoids-3.1, semigroupoids-3.0.3, semigroupoids-3.0.2, semigroupoids-3.0.1, semigroupoids-3.0.0.2, semigroupoids-3.0.0.1, semigroupoids-3.0, semigroupoids-1.3.4, semigroupoids-1.3.3, semigroupoids-1.3.2.1, semigroupoids-1.3.2, semigroupoids-1.3.1.2, semigroupoids-1.3.1.1, semigroupoids-1.3.1, semigroupoids-1.3, semigroupoids-1.2.6.2, semigroupoids-1.2.6.1, semigroupoids-1.2.6, semigroupoids-1.2.5, semigroupoids-1.2.4, semigroupoids-1.2.2.4, semigroupoids-1.2.2.3, semigroupoids-1.2.2.2, semigroupoids-1.2.2.1, semigroupoids-1.2.2, semigroupoids-1.2.1, semigroupoids-1.2.0, semigroupoids-1.1.3, semigroupoids-1.1.2, semigroupoids-1.1.1, semigroupoids-1.1.0, semigroupoids-1.0.0 (conflict: semialign +semigroupoids => semigroupoids>=5.3.2 && <6.1) [__6] rejecting: semigroupoids-6 (conflict: base==4.18.1.0/installed-4.18.1.0, semigroupoids => base>=4.9 && <4.18) [__6] skipping: semigroupoids-5.3, semigroupoids-4.5 (has the same characteristics that caused the previous version to fail: excludes 'base' version 4.18.1.0) [__6] fail (backjumping, conflict set: base, semialign, semigroupoids, transformers, semialign:semigroupoids) After searching the rest of the dependency tree exhaustively, these were the goals I've had most trouble fulfilling: exploring-interpreters, base, aeson, semigroupoids, semialign, semialign:semigroupoids, transformers Try running with --minimize-conflict-set to improve the error message.