# \`DifferentialEquations.jl\` and \`KrylovKit.jl\` not playing nice together

**URL:** <https://discourse.julialang.org/t/differentialequations-jl-and-krylovkit-jl-not-playing-nice-together/129811>\
**Category:** Package Management\
**Tags:** package, linearalgebra, differentialequation\
**Created:** [June 11, 2025, 3:05pm UTC](https://discourse.julialang.org/t/differentialequations-jl-and-krylovkit-jl-not-playing-nice-together/129811 "2025-06-11T15:05:49Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![NitinGupta](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/nitingupta/32/53176_2.png) [@NitinGupta](https://discourse.julialang.org/u/NitinGupta)\
**Post date:** [June 11, 2025, 3:05pm UTC](https://discourse.julialang.org/t/differentialequations-jl-and-krylovkit-jl-not-playing-nice-together/129811/1 "2025-06-11T15:05:49Z")

</div>

I cannot get the above-mentioned two packages to work together. If I have one of them installed, the other one does not install (apparently an issue with `LinearSolve` and `DiffEqArrayOperator`.

I tested this to be the case because either of them install fine (after removing both) and also if I create a temporary environment, either of them install just fine on their own!

Can someone help me out please? Thanks.

Edit:

1. `versioninfo()`

```julia
Julia Version 1.11.4
Commit 8561cc3d68d (2025-03-10 11:36 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: 56 × Intel(R) Xeon(R) Gold 6258R CPU @ 2.70GHz
  WORD_SIZE: 64
  LLVM: libLLVM-16.0.6 (ORCJIT, cascadelake)
Threads: 1 default, 0 interactive, 1 GC (on 56 virtual cores)

```

1. `]st`

```julia
Status `~/.julia/environments/v1.11/Project.toml`
  [336ed68f] CSV v0.10.15
⌃ [13f3f980] CairoMakie v0.12.18
  [5a033b19] CurveFit v0.6.1
  [a93c6f00] DataFrames v1.7.0
  [0c46a032] DifferentialEquations v7.16.1
  [31c24e10] Distributions v0.25.120
  [ffbed154] DocStringExtensions v0.9.5
  [d4d017d3] ExponentialUtilities v1.27.0
  [7a1cc6ca] FFTW v1.9.0
  [7073ff75] IJulia v1.28.1
  [b964fa9f] LaTeXStrings v1.4.0
  [7a12625a] LinearMaps v3.11.4
⌅ [ee78f7c6] Makie v0.21.18
  [8314cec4] PGFPlotsX v1.6.2
  [f07625cc] PauliStrings v1.6.1
  [f0f68f2c] PlotlyJS v0.18.16
  [91a5bcdd] Plots v1.40.13
  [08abe8d2] PrettyTables v2.4.0
  [49802e3a] ProgressBars v1.5.1
  [d330b81b] PyPlot v2.11.6
  [ae5ea0c6] Quantica v1.2.0
  [78ae1a1f] QuantumLattices v0.12.2
⌅ [c0aeaf25] SciMLOperators v0.3.13
  [6aa5eb33] TaylorSeries v0.20.1
  [811555cd] ThreadPinning v1.0.2
  [8603256b] ZChop v0.3.11
  [37e2e46d] LinearAlgebra v1.11.0
  [de0858da] Printf v1.11.0
  [9a3f8284] Random v1.11.0
  [2f01184e] SparseArrays v1.11.0
Info Packages marked with ⌃ and ⌅ have new versions available. Those with ⌃ may be upgradable, but those with ⌅ are restricted by compatibility constraints from upgrading. To see why use `status --outdated`

```

1. Adding `KrylovKit.jl` after `DifferentialEquations.jl` is already installed in my main environment shows the following log. For some reason, I don’t see any issues when I install these packages together in a temporary environment. Notably `KrylovKit.jl` removes many important dependencies during the install. Also, in the temporary environment the version of `KrylovKit.jl` that installs is `v0.9.5` while in the main environment it is `v0.7.1` while the version of `DifferentialEquations.jl` is same for both environments `v7.16.1` - is this older version of `KrylovKit.jl` perhaps the issue?

```julia
(@v1.11) pkg> add KrylovKit
   Resolving package versions...
    Updating `~/.julia/environments/v1.11/Project.toml`
⌃ [0b1a1467] + KrylovKit v0.7.1
    Updating `~/.julia/environments/v1.11/Manifest.toml`
  [a95523ee] - AlmostBlockDiagonals v0.1.10
⌃ [764a87c0] ↓ BoundaryValueDiffEq v5.18.0 ⇒ v5.9.1
  [7227322d] - BoundaryValueDiffEqAscher v1.7.0
  [56b672f2] - BoundaryValueDiffEqCore v1.10.0
  [85d9eb09] - BoundaryValueDiffEqFIRK v1.8.0
  [1a22d4ce] - BoundaryValueDiffEqMIRK v1.8.0
  [9255f1d6] - BoundaryValueDiffEqMIRKN v1.7.0
  [ed55bfe0] - BoundaryValueDiffEqShooting v1.8.0
  [70df07ce] - BracketingNonlinearSolve v1.3.0
⌃ [bcd4f6db] ↓ DelayDiffEq v5.53.1 ⇒ v5.48.1
⌅ [a0c0ee7d] ↓ DifferentiationInterface v0.6.52 ⇒ v0.6.26
⌃ [f151be2c] ↓ EnzymeCore v0.8.11 ⇒ v0.7.8
  [442a2c76] - FastGaussQuadrature v1.0.2
  [29a986be] + FastLapackInterface v2.0.4
⌅ [f6369f11] ↓ ForwardDiff v1.0.1 ⇒ v0.10.38
  [3e5b6fbb] + HostCPUFeatures v0.1.17
  [ef3ab10e] + KLU v0.6.0
⌅ [ba0b0d4f] ↓ Krylov v0.10.1 ⇒ v0.9.10
⌃ [0b1a1467] + KrylovKit v0.7.1
  [87fe0de2] - LineSearch v0.1.4
⌅ [7ed4a6bd] ↓ LinearSolve v3.17.0 ⇒ v2.30.1
  [bdcacae8] + LoopVectorization v0.12.172
⌃ [d41bc354] ↓ NLSolversBase v7.10.0 ⇒ v7.8.3
⌅ [8913a72c] ↓ NonlinearSolve v4.9.0 ⇒ v3.14.0
  [be0214bd] - NonlinearSolveBase v1.8.0
  [5959db7a] - NonlinearSolveFirstOrder v1.5.0
  [9a2c21bd] - NonlinearSolveQuasiNewton v1.5.0
  [26075421] - NonlinearSolveSpectralMethods v1.2.0
⌃ [429524aa] ↓ Optim v1.12.0 ⇒ v1.11.0
⌃ [1dea7af3] ↓ OrdinaryDiffEq v6.98.0 ⇒ v6.87.0
  [89bda076] - OrdinaryDiffEqAdamsBashforthMoulton v1.2.0
  [6ad6398a] - OrdinaryDiffEqBDF v1.6.0
  [50262376] - OrdinaryDiffEqDefault v1.4.0
  [4302a76b] - OrdinaryDiffEqDifferentiation v1.10.0
  [9286f039] - OrdinaryDiffEqExplicitRK v1.1.0
  [e0540318] - OrdinaryDiffEqExponentialRK v1.4.0
  [becaefa8] - OrdinaryDiffEqExtrapolation v1.5.0
  [5960d6e9] - OrdinaryDiffEqFIRK v1.12.0
  [101fe9f7] - OrdinaryDiffEqFeagin v1.1.0
  [d3585ca7] - OrdinaryDiffEqFunctionMap v1.1.1
  [d28bc4f8] - OrdinaryDiffEqHighOrderRK v1.1.0
  [9f002381] - OrdinaryDiffEqIMEXMultistep v1.3.0
  [521117fe] - OrdinaryDiffEqLinear v1.3.0
  [1344f307] - OrdinaryDiffEqLowOrderRK v1.2.0
  [b0944070] - OrdinaryDiffEqLowStorageRK v1.3.0
  [127b3ac7] - OrdinaryDiffEqNonlinearSolve v1.10.0
  [c9986a66] - OrdinaryDiffEqNordsieck v1.1.0
  [5dd0a6cf] - OrdinaryDiffEqPDIRK v1.3.1
  [5b33eab2] - OrdinaryDiffEqPRK v1.1.0
  [04162be5] - OrdinaryDiffEqQPRK v1.1.0
  [af6ede74] - OrdinaryDiffEqRKN v1.1.0
  [43230ef6] - OrdinaryDiffEqRosenbrock v1.11.0
  [2d112036] - OrdinaryDiffEqSDIRK v1.3.0
  [669c94d9] - OrdinaryDiffEqSSPRK v1.3.0
  [e3e12d00] - OrdinaryDiffEqStabilizedIRK v1.3.0
  [358294b1] - OrdinaryDiffEqStabilizedRK v1.1.0
  [fa646aed] - OrdinaryDiffEqSymplecticRK v1.3.0
  [b1df2697] - OrdinaryDiffEqTsit5 v1.1.0
  [79d7bb75] - OrdinaryDiffEqVerner v1.2.0
  [65ce6f38] + PackageExtensionCompat v1.0.2
  [f2c3362d] + RecursiveFactorization v0.2.23
  [476501e8] + SLEEFPirates v0.6.43
  [19f34311] - SciMLJacobianOperators v0.1.5
⌅ [727e6d20] ↓ SimpleNonlinearSolve v2.5.0 ⇒ v1.12.5
  [9f842d2f] - SparseConnectivityTracer v0.6.20
  [47a9eef4] + SparseDiffTools v2.26.0
  [0a514795] - SparseMatrixColorings v0.4.20
  [e56a9233] + Sparspak v0.3.11
⌃ [9672c7b4] ↓ SteadyStateDiffEq v2.5.0 ⇒ v2.4.1
⌃ [789caeaf] ↓ StochasticDiffEq v6.80.0 ⇒ v6.72.1
  [d5829a12] + TriangularSolve v0.2.1
⌅ [409d34a3] + VectorInterface v0.4.9
  [3d5dd08c] + VectorizationBase v0.21.71
  [19fa3120] + VertexSafeGraphs v0.2.0
        Info Packages marked with ⌃ and ⌅ have new versions available. Those with ⌃ may be upgradable, but those with ⌅ are restricted by compatibility constraints from upgrading. To see why use `status --outdated -m`
Precompiling project...
  Progress [========================================>] 23/23
  ✓ DifferentiationInterface
  ✓ NLSolversBase
  ✓ DifferentiationInterface → DifferentiationInterfaceForwardDiffExt
  ✓ DifferentiationInterface → DifferentiationInterfaceFiniteDiffExt
  ✓ DifferentiationInterface → DifferentiationInterfaceStaticArraysExt
  ✓ DifferentiationInterface → DifferentiationInterfaceChainRulesCoreExt
  ✓ DifferentiationInterface → DifferentiationInterfaceSparseArraysExt
  ✗ LinearSolve
  ✗ SteadyStateDiffEq
  ✓ SimpleNonlinearSolve
  ✓ Optim
  ✗ LinearSolve → LinearSolveBandedMatricesExt
  ✗ LinearSolve → LinearSolveFastAlmostBandedMatricesExt
  ✗ LinearSolve → LinearSolveKrylovKitExt
  ✗ LinearSolve → LinearSolveRecursiveArrayToolsExt
  ✓ SimpleNonlinearSolve → SimpleNonlinearSolveChainRulesCoreExt
  ✗ NonlinearSolve
  ✗ NonlinearSolve → NonlinearSolveBandedMatricesExt
  ✗ NonlinearSolve → NonlinearSolveNLsolveExt
  ✗ OrdinaryDiffEq
  ✗ DelayDiffEq
  ✗ StochasticDiffEq
  ✗ BoundaryValueDiffEq
  10 dependencies successfully precompiled in 161 seconds. 582 already precompiled.
  10 dependencies precompiled but different versions are currently loaded. Restart julia to access the new versions. Otherwise, loading dependents of these packages may trigger further precompilation to work with the unexpected versions.

```

---

<div class="post-metadata">

**Author:** ![Oscar\_Smith](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/oscar_smith/32/25343_2.png) [@Oscar\_Smith](https://discourse.julialang.org/u/Oscar_Smith)\
**Post date:** [June 11, 2025, 3:27pm UTC](https://discourse.julialang.org/t/differentialequations-jl-and-krylovkit-jl-not-playing-nice-together/129811/2 "2025-06-11T15:27:08Z")

</div>

Seems to be working for me. What does `]st` show? (also `versioninfo()` might be nice)

---

<div class="post-metadata">

**Author:** ![NitinGupta](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/nitingupta/32/53176_2.png) [@NitinGupta](https://discourse.julialang.org/u/NitinGupta)\
**Post date:** [June 11, 2025, 3:59pm UTC](https://discourse.julialang.org/t/differentialequations-jl-and-krylovkit-jl-not-playing-nice-together/129811/3 "2025-06-11T15:59:08Z")

</div>

My bad, edited the post to include both of those - `]st` doesn’t show `KrylovKit` as I removed it - but there’s an older version of it that gets installed (see point 3 of the edited post).

Interestingly, I just tried to install both packages together (and nothing else) in a temporary project, `] activate temp; add KrylovKit; add DifferentialEquations` and it worked!

But when I try to do this in my main environment, if one of them is installed the other refuses to install due to an issue with `LinearSolve` (among others). I’m attaching the log on the main post as well.

---

<div class="post-metadata">

**Author:** ![Oscar\_Smith](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/oscar_smith/32/25343_2.png) [@Oscar\_Smith](https://discourse.julialang.org/u/Oscar_Smith)\
**Post date:** [June 11, 2025, 4:13pm UTC](https://discourse.julialang.org/t/differentialequations-jl-and-krylovkit-jl-not-playing-nice-together/129811/4 "2025-06-11T16:13:13Z")

</div>

What happens if you `]add SciMLOperators@1`?

---

<div class="post-metadata">

**Author:** ![NitinGupta](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/nitingupta/32/53176_2.png) [@NitinGupta](https://discourse.julialang.org/u/NitinGupta)\
**Post date:** [June 11, 2025, 4:13pm UTC](https://discourse.julialang.org/t/differentialequations-jl-and-krylovkit-jl-not-playing-nice-together/129811/5 "2025-06-11T16:13:55Z")

</div>

apparently, the problem was with another package `Quantica.jl` - having it installed forces `KrylovKit.jl` to install an older version which is incompatible with `DifferentialEquations.jl`… removing `Quantica.jl` let me install both `KrylovKit.jl` and `DifferentialEquations.jl` simultaneously without issues!