This dashboard answers these questions about projects that depend on mathlib4:
- How far behind is the dependency revision? A scheduled workflow builds each registered downstream against the most recent mathlib commit (the target). The age column shows how many commits your pinned revision lags behind it.
- Which commit introduced the incompatibility? When the downstream is incompatible with the target, we run hopscotch to scan the mathlib history between the pinned revision and the target, to identify the first known bad commit — the earliest Mathlib revision incompatible with the downstream — and the last known good commit just before it.
- How much can I safely advance the dependency? The last known good commit is a safe upgrade target. The bump column shows the distance between it and the currently pinned revision.
Glossary
| Downstream | Pinned to | Age | Target | Compatibility | Last known good | First known bad | Bump | Last good release | Links |
|---|---|---|---|---|---|---|---|---|---|
| 38b74e6 | 9d (+150) | 9c0c555 | compatible checked 2026-08-03 | 9c0c555 | — | +150 | v4.33.0-rc1 (-163) | ||
add-combi builds successfully against Mathlib 9c0c555. Its pin can be safely advanced by 150 commits to the last known good revision 9c0c555. Last checked2026-08-03 06:38 UTC ()Validation took1m 44sHow it was checkedDirect build of the target revision only (no commit-window search was needed or possible) | |||||||||
| v4.32.0 | 9d (+1) | v4.32.1 | compatible checked 2026-08-03 | v4.32.1 | — | +1 | v4.32.1 (+1) | ||
apap builds successfully against Mathlib v4.32.1. Its pin can be safely advanced by 1 commit to the last known good revision v4.32.1. Last checked2026-08-03 06:38 UTC ()Validation took19sHow it was checkedSkipped — this exact project revision was already validated as compatible with this Mathlib revision in a previous run | |||||||||
| v4.33.0-rc1 | 17d (+313) | 9c0c555 | compatible checked 2026-08-03 | 9c0c555 | — | +313 | v4.33.0-rc1 | ||
BrauerGroup builds successfully against Mathlib 9c0c555. Its pin can be safely advanced by 313 commits to the last known good revision 9c0c555. Mathlib commit window (older → newer) Last checked2026-08-03 06:38 UTC ()Validation took5m 27sHow it was checkedDirect build of the target revision only (no commit-window search was needed or possible) | |||||||||
| v4.33.0-rc1 | 17d (+313) | 9c0c555 | compatible checked 2026-08-03 | 9c0c555 | — | +313 | v4.33.0-rc1 | ||
cam-combi builds successfully against Mathlib 9c0c555. Its pin can be safely advanced by 313 commits to the last known good revision 9c0c555. Mathlib commit window (older → newer) Last checked2026-08-03 06:38 UTC ()Validation took1m 35sHow it was checkedDirect build of the target revision only (no commit-window search was needed or possible) | |||||||||
| master-2026-07-28 | 5d (+81) | 9c0c555 | incompatible checked 2026-08-03 | af9aa73 | 5b1613e | +5 | v4.33.0-rc1 (-232) | ||
carleson fails to build against Mathlib 9c0c555. The incompatibility was introduced by Mathlib commit 5b1613e (“chore: reduce the abuse of the defeq `Set α := α → Prop` (#42169)”). The commit immediately before it, af9aa73, still works and is a safe upgrade target. Mathlib commit window (older → newer) Last checked2026-08-03 06:38 UTC ()Validation took2m 25sHow it was checkedDirect build of the target revision; it matches a previously identified incompatibility, so the known good/bad boundary from the earlier bisect is shownFailed during lake build | |||||||||
| v4.32.0 | 9d (+1) | v4.32.1 | compatible checked 2026-08-03 | v4.32.1 | — | +1 | v4.32.1 (+1) | ||
chandra-furst-lipton builds successfully against Mathlib v4.32.1. Its pin can be safely advanced by 1 commit to the last known good revision v4.32.1. Last checked2026-08-03 06:38 UTC ()Validation took16sHow it was checkedSkipped — this exact project revision was already validated as compatible with this Mathlib revision in a previous run | |||||||||
| 26245e6 | 9d (+125) | 9c0c555 | compatible checked 2026-08-03 | 9c0c555 | — | +125 | v4.33.0-rc1 (-188) | ||
ClassFieldTheory builds successfully against Mathlib 9c0c555. Its pin can be safely advanced by 125 commits to the last known good revision 9c0c555. Last checked2026-08-03 06:38 UTC ()Validation took4m 26sHow it was checkedDirect build of the target revision only (no commit-window search was needed or possible) | |||||||||
| v4.32.0 | 9d (+1) | v4.32.1 | compatible checked 2026-08-03 | v4.32.1 | — | +1 | v4.32.1 (+1) | ||
compfiles builds successfully against Mathlib v4.32.1. Its pin can be safely advanced by 1 commit to the last known good revision v4.32.1. Last checked2026-08-03 06:38 UTC ()Validation took4m 07sHow it was checkedDirect build of the target revision only (no commit-window search was needed or possible) | |||||||||
| 169c26b | 13d (+237) | 9c0c555 | incompatible checked 2026-08-03 | af3493f | 3069656 | +192 | v4.33.0-rc1 (-76) | ||
cslib fails to build against Mathlib 9c0c555. The incompatibility was introduced by Mathlib commit 3069656 (“feat: `haveI`/`letI` tactic linter (#41657)”). The commit immediately before it, af3493f, still works and is a safe upgrade target. Mathlib commit window (older → newer) Last checked2026-08-03 06:38 UTC ()Validation took7m 14sHow it was checkedDirect build of the target revision; it matches a previously identified incompatibility, so the known good/bad boundary from the earlier bisect is shownFailed during lake build | |||||||||
| b595917 | 5d (+67) | 9c0c555 | compatible checked 2026-08-03 | 9c0c555 | — | +67 | v4.33.0-rc1 (-246) | ||
DynamicalSystems builds successfully against Mathlib 9c0c555. Its pin can be safely advanced by 67 commits to the last known good revision 9c0c555. Last checked2026-08-03 06:38 UTC ()Validation took2m 04sHow it was checkedDirect build of the target revision only (no commit-window search was needed or possible) | |||||||||
| 0be66d7 | 0d (+4) | v4.31.0 | compatible checked 2026-08-03 | v4.31.0 | — | +4 | v4.31.0 (+4) | ||
ErdosUnitDistance builds successfully against Mathlib v4.31.0. Its pin can be safely advanced by 4 commits to the last known good revision v4.31.0. Last checked2026-08-03 06:38 UTC ()Validation took18sHow it was checkedSkipped — this exact project revision was already validated as compatible with this Mathlib revision in a previous run | |||||||||
| 169c26b | 13d (+237) | 9c0c555 | incompatible checked 2026-08-03 | 033397d | c026161 | +47 | v4.33.0-rc1 (-76) | ||
FLT fails to build against Mathlib 9c0c555. The incompatibility was introduced by Mathlib commit c026161 (“chore: fix diamond for unit powers (#41999)”). The commit immediately before it, 033397d, still works and is a safe upgrade target. Mathlib commit window (older → newer) Last checked2026-08-03 06:38 UTC ()Validation took45m 32sHow it was checkedFull bisect — the Mathlib commit window was searched in this run to pinpoint the exact breaking commitFailed during lake build | |||||||||
| 6ecc792 | 2d (+25) | 9c0c555 | compatible checked 2026-08-03 | 9c0c555 | — | +25 | v4.33.0-rc1 (-288) | ||
flt-regular builds successfully against Mathlib 9c0c555. Its pin can be safely advanced by 25 commits to the last known good revision 9c0c555. Last checked2026-08-03 06:38 UTC ()Validation took2m 03sHow it was checkedDirect build of the target revision only (no commit-window search was needed or possible) | |||||||||
| v4.33.0-rc1 | 17d (+313) | 9c0c555 | compatible checked 2026-08-03 | 9c0c555 | — | +313 | v4.33.0-rc1 | ||
forbidden-matrix builds successfully against Mathlib 9c0c555. Its pin can be safely advanced by 313 commits to the last known good revision 9c0c555. Mathlib commit window (older → newer) Last checked2026-08-03 06:38 UTC ()Validation took1m 46sHow it was checkedDirect build of the target revision only (no commit-window search was needed or possible) | |||||||||
| v4.33.0-rc1 | 17d (+313) | 9c0c555 | compatible checked 2026-08-03 | 9c0c555 | — | +313 | v4.33.0-rc1 | ||
gibbs-measure builds successfully against Mathlib 9c0c555. Its pin can be safely advanced by 313 commits to the last known good revision 9c0c555. Mathlib commit window (older → newer) Last checked2026-08-03 06:38 UTC ()Validation took1m 32sHow it was checkedDirect build of the target revision only (no commit-window search was needed or possible) | |||||||||
| v4.33.0-rc1 | 17d (+313) | 9c0c555 | incompatible checked 2026-08-03 | 4756cbb | 587ae26 | +168 | v4.33.0-rc1 | ||
hex-dev fails to build against Mathlib 9c0c555. The incompatibility was introduced by Mathlib commit 587ae26 (“feat(Data/Complex/Basic): add simproc to reduce powers of I (#39506)”). The commit immediately before it, 4756cbb, still works and is a safe upgrade target. Mathlib commit window (older → newer) Last checked2026-08-03 06:38 UTC ()Validation took1h 10mHow it was checkedFull bisect — the Mathlib commit window was searched in this run to pinpoint the exact breaking commitFailed during lake build | |||||||||
| 5eec30b | 5d (+59) | 9c0c555 | compatible checked 2026-08-03 | 9c0c555 | — | +59 | v4.33.0-rc1 (-254) | ||
HighlyAbundant builds successfully against Mathlib 9c0c555. Its pin can be safely advanced by 59 commits to the last known good revision 9c0c555. Last checked2026-08-03 06:38 UTC ()Validation took6m 13sHow it was checkedDirect build of the target revision only (no commit-window search was needed or possible) | |||||||||
| v4.32.0 | 9d (+1) | v4.32.1 | compatible checked 2026-08-03 | v4.32.1 | — | +1 | v4.32.1 (+1) | ||
infinity-cosmos builds successfully against Mathlib v4.32.1. Its pin can be safely advanced by 1 commit to the last known good revision v4.32.1. Last checked2026-08-03 06:38 UTC ()Validation took5m 55sHow it was checkedDirect build of the target revision only (no commit-window search was needed or possible) | |||||||||
| v4.30.0-rc1 | 13d (+420) | v4.30.0-rc2 | incompatible checked 2026-08-03 | cb39573 | ff51775 | +412 | v4.30.0-rc1 | ||
LeanDownstreamPlayground fails to build against Mathlib v4.30.0-rc2. The incompatibility was introduced by Mathlib commit ff51775 (“chore(AlgebraicTopology): rename `SingularHomology.HomotopyInvarianceTopCat` (#37658)”). The commit immediately before it, cb39573, still works and is a safe upgrade target. Mathlib commit window (older → newer) Last checked2026-08-03 06:38 UTC ()Validation took2m 03sHow it was checkedDirect build of the target revision; it matches a previously identified incompatibility, so the known good/bad boundary from the earlier bisect is shownFailed during lake build | |||||||||
| 18f56be | 0d (+5) | 9c0c555 | compatible checked 2026-08-03 | 9c0c555 | — | +5 | v4.33.0-rc1 (-308) | ||
LeanMachineLearning builds successfully against Mathlib 9c0c555. Its pin can be safely advanced by 5 commits to the last known good revision 9c0c555. Last checked2026-08-03 06:38 UTC ()Validation took2m 20sHow it was checkedDirect build of the target revision only (no commit-window search was needed or possible) | |||||||||
| eb6a272 | 11d (+188) | 9c0c555 | compatible checked 2026-08-03 | 9c0c555 | — | +188 | v4.33.0-rc1 (-125) | ||
mean-fourier builds successfully against Mathlib 9c0c555. Its pin can be safely advanced by 188 commits to the last known good revision 9c0c555. Last checked2026-08-03 06:38 UTC ()Validation took1m 49sHow it was checkedDirect build of the target revision only (no commit-window search was needed or possible) | |||||||||
| v4.32.0 | 9d (+1) | v4.32.1 | compatible checked 2026-08-03 | v4.32.1 | — | +1 | v4.32.1 (+1) | ||
misc-yd builds successfully against Mathlib v4.32.1. Its pin can be safely advanced by 1 commit to the last known good revision v4.32.1. Last checked2026-08-03 06:38 UTC ()Validation took17sHow it was checkedSkipped — this exact project revision was already validated as compatible with this Mathlib revision in a previous run | |||||||||
| v4.32.0 | 9d (+1) | v4.32.1 | compatible checked 2026-08-03 | v4.32.1 | — | +1 | v4.32.1 (+1) | ||
PersistentDecomp builds successfully against Mathlib v4.32.1. Its pin can be safely advanced by 1 commit to the last known good revision v4.32.1. Last checked2026-08-03 06:38 UTC ()Validation took17sHow it was checkedSkipped — this exact project revision was already validated as compatible with this Mathlib revision in a previous run | |||||||||
| 38b74e6 | 9d (+150) | 9c0c555 | compatible checked 2026-08-03 | 9c0c555 | — | +150 | v4.33.0-rc1 (-163) | ||
| v4.32.0 | 9d (+1) | v4.32.1 | compatible checked 2026-08-03 | v4.32.1 | — | +1 | v4.32.1 (+1) | ||
| b8dad03 | 5d (+198) | v4.28.0 | compatible checked 2026-08-03 | v4.28.0 | — | +198 | v4.28.0 (+198) | ||
Poly builds successfully against Mathlib v4.28.0. Its pin can be safely advanced by 198 commits to the last known good revision v4.28.0. Last checked2026-08-03 06:38 UTC ()Validation took18sHow it was checkedSkipped — this exact project revision was already validated as compatible with this Mathlib revision in a previous run | |||||||||
| 5b3f719 | 6d (+85) | 9c0c555 | compatible checked 2026-08-03 | 9c0c555 | — | +85 | v4.33.0-rc1 (-228) | ||
PrimeCert builds successfully against Mathlib 9c0c555. Its pin can be safely advanced by 85 commits to the last known good revision 9c0c555. Last checked2026-08-03 06:38 UTC ()Validation took1m 41sHow it was checkedDirect build of the target revision only (no commit-window search was needed or possible) | |||||||||
detached | 5d (+366) | 9c0c555 | incompatible checked 2026-08-03 | — | 1f8806b | — | — | ||
PrimeNumberTheoremAnd fails to build against Mathlib 9c0c555. The earliest known incompatible Mathlib commit is 1f8806b (“fix: adaptations for batteries #1927 (#42229)”). Last checked2026-08-03 06:38 UTC ()Validation took3m 28sHow it was checkedDirect build of the target revision; it matches a previously identified incompatibility, so the known good/bad boundary from the earlier bisect is shownFailed during lake build⚠ The pinned revision is not an ancestor of the target, so no commit window could be searched — only the target itself was validated. | |||||||||
| v4.31.0 | 3d (+113) | v4.32.0-rc1 | compatible checked 2026-08-03 | v4.32.0-rc1 | — | +113 | v4.32.0-rc1 (+113) | ||
Robo builds successfully against Mathlib v4.32.0-rc1. Its pin can be safely advanced by 113 commits to the last known good revision v4.32.0-rc1. Mathlib commit window (older → newer) Last checked2026-08-03 06:38 UTC ()Validation took17sHow it was checkedSkipped — this exact project revision was already validated as compatible with this Mathlib revision in a previous run | |||||||||
| v4.32.0 | 9d (+1) | v4.32.1 | compatible checked 2026-08-03 | v4.32.1 | — | +1 | v4.32.1 (+1) | ||
Sphere-Packing-Lean builds successfully against Mathlib v4.32.1. Its pin can be safely advanced by 1 commit to the last known good revision v4.32.1. Last checked2026-08-03 06:38 UTC ()Validation took17sHow it was checkedSkipped — this exact project revision was already validated as compatible with this Mathlib revision in a previous run | |||||||||
| edc39bf | 4d (+48) | 9c0c555 | compatible checked 2026-08-03 | 9c0c555 | — | +48 | v4.33.0-rc1 (-265) | ||
Statlib builds successfully against Mathlib 9c0c555. Its pin can be safely advanced by 48 commits to the last known good revision 9c0c555. Last checked2026-08-03 06:38 UTC ()Validation took1m 43sHow it was checkedDirect build of the target revision only (no commit-window search was needed or possible) | |||||||||
| v4.31.0-rc1 | 10d (+329) | v4.31.0-rc2 | incompatible checked 2026-08-03 | 01cc327 | 89ce8bf | +259 | v4.31.0-rc1 | ||
sum_product fails to build against Mathlib v4.31.0-rc2. The incompatibility was introduced by Mathlib commit 89ce8bf (“feat(Tactic): `convert` discharges side goals reducibly (#39928)”). The commit immediately before it, 01cc327, still works and is a safe upgrade target. Mathlib commit window (older → newer) Last checked2026-08-03 06:38 UTC ()Validation took11m 32sHow it was checkedDirect build of the target revision; it matches a previously identified incompatibility, so the known good/bad boundary from the earlier bisect is shownFailed during lake build | |||||||||
| 3069656 | 4d (+44) | 9c0c555 | incompatible checked 2026-08-03 | f60ac0e | 0f0a217 | +14 | v4.33.0-rc1 (-269) | ||
TauCeti fails to build against Mathlib 9c0c555. The incompatibility was introduced by Mathlib commit 0f0a217 (“chore(CategoryTheory): remove `backward` options using `implicit_reducible` (#42161)”). The commit immediately before it, f60ac0e, still works and is a safe upgrade target. Mathlib commit window (older → newer) Last checked2026-08-03 06:38 UTC ()Validation took39m 42sHow it was checkedFull bisect — the Mathlib commit window was searched in this run to pinpoint the exact breaking commitFailed during lake build | |||||||||
| 0ce898f | 5d (+60) | 9c0c555 | compatible checked 2026-08-03 | 9c0c555 | — | +60 | v4.33.0-rc1 (-253) | ||
| No downstream matches the current filters. | |||||||||