diff --git a/Project.toml b/Project.toml
index 3be52cd14..638a0ca22 100644
--- a/Project.toml
+++ b/Project.toml
@@ -20,6 +20,7 @@ FFTW = "7a1cc6ca-52ef-59f5-83cd-3a7055c09341"
 FiniteDiff = "6a86dc24-6348-571c-b903-95158fe2bd41"
 ForwardDiff = "f6369f11-7733-5829-9624-2563aa707210"
 GlobalSensitivity = "af5da776-676b-467e-8baf-acd8249e4f0f"
+GPUArrays = "0c68f7d7-f131-5f86-a1c3-88cf8149b2d7"
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 LinearSolve = "7ed4a6bd-45f5-4d41-b270-4a48e9bafcae"
 OrdinaryDiffEq = "1dea7af3-3e70-54e6-95c3-0bf5283fa5ed"
@@ -30,7 +31,6 @@ Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 RandomNumbers = "e6cf234a-135c-5ec9-84dd-332b85af5143"
 RecursiveArrayTools = "731186ca-8d62-57ce-b412-fbd966d074cd"
 Reexport = "189a3867-3050-52da-a836-e630ba90ab69"
-Requires = "ae029012-a4dd-5104-9daa-d747884805df"
 ReverseDiff = "37e2e3b7-166d-5795-8a7a-e32c996b4267"
 SciMLBase = "0bca4576-84f4-4d90-8ffe-ffa030f20462"
 SharedArrays = "1a1011a3-84de-559e-8e89-a11a2f7dc383"
@@ -57,6 +57,7 @@ FFTW = "1.1"
 FiniteDiff = "2"
 ForwardDiff = "0.10"
 GlobalSensitivity = "1.0"
+GPUArrays = "8"
 LinearSolve = "1"
 OrdinaryDiffEq = "5.60, 6"
 Parameters = "0.12"
@@ -65,7 +66,6 @@ QuasiMonteCarlo = "0.1, 0.2"
 RandomNumbers = "1.5.3"
 RecursiveArrayTools = "2.4.2"
 Reexport = "0.2, 1.0"
-Requires = "1"
 ReverseDiff = "1.9"
 SciMLBase = "1.24"
 StochasticDiffEq = "6.20"
diff --git a/README.md b/README.md
index 4b9ab4619..9e38fad05 100644
--- a/README.md
+++ b/README.md
@@ -9,4 +9,3 @@
 DiffEqSensitivity.jl is a component package in the [SciML Scientific Machine Learning ecosystem](https://sciml.ai/). It holds the
 sensitivity analysis utilities. Users interested in using this
 functionality should check out [DifferentialEquations.jl](https://github.com/JuliaDiffEq/DifferentialEquations.jl).
-
diff --git a/src/DiffEqSensitivity.jl b/src/DiffEqSensitivity.jl
index 037914ef0..fdd30e2e3 100644
--- a/src/DiffEqSensitivity.jl
+++ b/src/DiffEqSensitivity.jl
@@ -6,7 +6,6 @@ using DiffEqOperators
 using Adapt
 using LinearSolve
 using Parameters: @unpack
-using Requires
 using StochasticDiffEq
 using SharedArrays
 using EllipsisNotation
@@ -16,6 +15,7 @@ using Random
 import ZygoteRules, Zygote, ReverseDiff
 import ArrayInterface
 import Enzyme
+import GPUArrays
 
 using Cassette, DiffRules
 using Core: CodeInfo, SlotNumber, SSAValue, ReturnNode, GotoIfNot
@@ -26,7 +26,6 @@ import ChainRulesCore: @thunk, NoTangent, @not_implemented
 abstract type SensitivityFunction end
 abstract type TransformedFunction end
 
-include("require.jl")
 include("hasbranching.jl")
 include("sensitivity_algorithms.jl")
 include("derivative_wrappers.jl")
@@ -45,6 +44,10 @@ include("second_order.jl")
 include("steadystate_adjoint.jl")
 include("sde_tools.jl")
 
+# AD Extensions
+include("reversediff.jl")
+include("tracker.jl")
+include("zygote.jl")
 
 
 export extract_local_sensitivities
diff --git a/src/concrete_solve.jl b/src/concrete_solve.jl
index 79f44ae1c..103808c8b 100644
--- a/src/concrete_solve.jl
+++ b/src/concrete_solve.jl
@@ -42,7 +42,7 @@ function DiffEqBase._concrete_solve_adjoint(prob::Union{ODEProblem,SDEProblem},
                         !(eltype(p) <: Complex) &&
                         length(u0) + length(p) <= 100
       ForwardDiffSensitivity()
-  elseif isgpu(u0) || !DiffEqBase.isinplace(prob)
+  elseif u0 isa GPUArrays.AbstractGPUArray || !DiffEqBase.isinplace(prob)
     # only Zygote is GPU compatible and fast
     # so if out-of-place, try Zygote
     if p === nothing || p === DiffEqBase.NullParameters()
@@ -66,7 +66,7 @@ end
 function DiffEqBase._concrete_solve_adjoint(prob::Union{NonlinearProblem,SteadyStateProblem},alg,
                                             sensealg::Nothing,u0,p,args...;kwargs...)
 
-  default_sensealg = if isgpu(u0) || !DiffEqBase.isinplace(prob)
+  default_sensealg = if u0 isa GPUArrays.AbstractGPUArray || !DiffEqBase.isinplace(prob)
     # autodiff = false because forwarddiff fails on many GPU kernels
     # this only effects the Jacobian calculation and is same computation order
     SteadyStateAdjoint(autodiff = false, autojacvec = ZygoteVJP())
diff --git a/src/require.jl b/src/require.jl
deleted file mode 100644
index 1a3ba6ffe..000000000
--- a/src/require.jl
+++ /dev/null
@@ -1,32 +0,0 @@
-isgpu(x) = false
-function __init__()
-    @require CuArrays="3a865a2d-5b23-5a0f-bc46-62713ec82fae" begin
-        gpu_or_cpu(x::CuArrays.CuArray) = CuArrays.CuArray
-        gpu_or_cpu(x::TrackedArray{<:Any,<:Any,<:CuArrays.CuArray}) = CuArrays.CuArray
-        gpu_or_cpu(x::Transpose{<:Any,<:CuArrays.CuArray}) = CuArrays.CuArray
-        gpu_or_cpu(x::Adjoint{<:Any,<:CuArrays.CuArray}) = CuArrays.CuArray
-        gpu_or_cpu(x::Adjoint{<:Any,TrackedArray{<:Any,<:Any,<:CuArrays.CuArray}}) = CuArrays.CuArray
-        gpu_or_cpu(x::Transpose{<:Any,TrackedArray{<:Any,<:Any,<:CuArrays.CuArray}}) = CuArrays.CuArray
-        isgpu(::CuArrays.CuArray) = true
-        isgpu(::TrackedArray{<:Any,<:Any,<:CuArrays.CuArray}) = true
-        isgpu(::Transpose{<:Any,<:CuArrays.CuArray}) = true
-        isgpu(::Adjoint{<:Any,<:CuArrays.CuArray}) = true
-        isgpu(::Adjoint{<:Any,TrackedArray{<:Any,<:Any,<:CuArrays.CuArray}}) = true
-        isgpu(::Transpose{<:Any,TrackedArray{<:Any,<:Any,<:CuArrays.CuArray}}) = true
-    end
-
-    @require CUDA="052768ef-5323-5732-b1bb-66c8b64840ba" begin
-        gpu_or_cpu(x::CUDA.CuArray) = CUDA.CuArray
-        gpu_or_cpu(x::TrackedArray{<:Any,<:Any,<:CUDA.CuArray}) = CUDA.CuArray
-        gpu_or_cpu(x::Transpose{<:Any,<:CUDA.CuArray}) = CUDA.CuArray
-        gpu_or_cpu(x::Adjoint{<:Any,<:CUDA.CuArray}) = CUDA.CuArray
-        gpu_or_cpu(x::Adjoint{<:Any,TrackedArray{<:Any,<:Any,<:CUDA.CuArray}}) = CUDA.CuArray
-        gpu_or_cpu(x::Transpose{<:Any,TrackedArray{<:Any,<:Any,<:CUDA.CuArray}}) = CUDA.CuArray
-        isgpu(::CUDA.CuArray) = true
-        isgpu(::TrackedArray{<:Any,<:Any,<:CUDA.CuArray}) = true
-        isgpu(::Transpose{<:Any,<:CUDA.CuArray}) = true
-        isgpu(::Adjoint{<:Any,<:CUDA.CuArray}) = true
-        isgpu(::Adjoint{<:Any,TrackedArray{<:Any,<:Any,<:CUDA.CuArray}}) = true
-        isgpu(::Transpose{<:Any,TrackedArray{<:Any,<:Any,<:CUDA.CuArray}}) = true
-    end
-end
diff --git a/src/reversediff.jl b/src/reversediff.jl
new file mode 100644
index 000000000..5c4407923
--- /dev/null
+++ b/src/reversediff.jl
@@ -0,0 +1,57 @@
+# Piracy that used to be requires, allowing ReverseDiff.jl to be specialized for SciML
+
+DiffEqBase.value(x::ReverseDiff.TrackedReal) = x.value
+DiffEqBase.value(x::ReverseDiff.TrackedArray) = x.value
+
+DiffEqBase.promote_u0(u0::ReverseDiff.TrackedArray, p::ReverseDiff.TrackedArray, t0) = u0
+DiffEqBase.promote_u0(u0::AbstractArray{<:ReverseDiff.TrackedReal}, p::ReverseDiff.TrackedArray, t0) = u0
+DiffEqBase.promote_u0(u0::ReverseDiff.TrackedArray, p::AbstractArray{<:ReverseDiff.TrackedReal}, t0) = u0
+DiffEqBase.promote_u0(u0::AbstractArray{<:ReverseDiff.TrackedReal}, p::AbstractArray{<:ReverseDiff.TrackedReal}, t0) = u0
+DiffEqBase.promote_u0(u0, p::ReverseDiff.TrackedArray, t0) = ReverseDiff.track(u0)
+DiffEqBase.promote_u0(u0, p::AbstractArray{<:ReverseDiff.TrackedReal}, t0) = eltype(p).(u0)
+
+# Support adaptive with non-tracked time
+@inline function DiffEqBase.ODE_DEFAULT_NORM(u::ReverseDiff.TrackedArray, t) where {N}
+    sqrt(sum(abs2, DiffEqBase.value(u)) / length(u))
+end
+@inline function DiffEqBase.ODE_DEFAULT_NORM(u::AbstractArray{<:ReverseDiff.TrackedReal,N}, t) where {N}
+    sqrt(sum(x -> DiffEqBase.ODE_DEFAULT_NORM(x[1], x[2]), zip((DiffEqBase.value(x) for x in u), Iterators.repeated(t))) / length(u))
+end
+@inline function DiffEqBase.ODE_DEFAULT_NORM(u::Array{<:ReverseDiff.TrackedReal,N}, t) where {N}
+    sqrt(sum(x -> DiffEqBase.ODE_DEFAULT_NORM(x[1], x[2]), zip((DiffEqBase.value(x) for x in u), Iterators.repeated(t))) / length(u))
+end
+@inline DiffEqBase.ODE_DEFAULT_NORM(u::ReverseDiff.TrackedReal, t) = abs(DiffEqBase.value(u))
+
+# Support TrackedReal time, don't drop tracking on the adaptivity there
+@inline function DiffEqBase.ODE_DEFAULT_NORM(u::ReverseDiff.TrackedArray, t::ReverseDiff.TrackedReal) where {N}
+    sqrt(sum(abs2, u) / length(u))
+end
+@inline function DiffEqBase.ODE_DEFAULT_NORM(u::AbstractArray{<:ReverseDiff.TrackedReal,N}, t::ReverseDiff.TrackedReal) where {N}
+    sqrt(sum(x -> DiffEqBase.ODE_DEFAULT_NORM(x[1], x[2]), zip(u, Iterators.repeated(t))) / length(u))
+end
+@inline function DiffEqBase.ODE_DEFAULT_NORM(u::Array{<:ReverseDiff.TrackedReal,N}, t::ReverseDiff.TrackedReal) where {N}
+    sqrt(sum(x -> DiffEqBase.ODE_DEFAULT_NORM(x[1], x[2]), zip(u, Iterators.repeated(t))) / length(u))
+end
+@inline DiffEqBase.ODE_DEFAULT_NORM(u::ReverseDiff.TrackedReal, t::ReverseDiff.TrackedReal) = abs(u)
+
+function DiffEqBase.solve_up(prob::DiffEqBase.DEProblem, sensealg::Union{DiffEqBase.AbstractSensitivityAlgorithm,Nothing}, u0::ReverseDiff.TrackedArray, p::ReverseDiff.TrackedArray, args...; kwargs...)
+    ReverseDiff.track(solve_up, prob, sensealg, u0, p, args...; kwargs...)
+end
+
+function DiffEqBase.solve_up(prob::DiffEqBase.DEProblem, sensealg::Union{DiffEqBase.AbstractSensitivityAlgorithm,Nothing}, u0, p::ReverseDiff.TrackedArray, args...; kwargs...)
+    ReverseDiff.track(solve_up, prob, sensealg, u0, p, args...; kwargs...)
+end
+
+function DiffEqBase.solve_up(prob::DiffEqBase.DEProblem, sensealg::Union{DiffEqBase.AbstractSensitivityAlgorithm,Nothing}, u0::ReverseDiff.TrackedArray, p, args...; kwargs...)
+    ReverseDiff.track(solve_up, prob, sensealg, u0, p, args...; kwargs...)
+end
+
+@inline function DiffEqNoiseProcess.wiener_randn(rng::Random.AbstractRNG, proto::ReverseDiff.TrackedArray)
+    ReverseDiff.track(convert.(eltype(proto.value), randn(rng, size(proto))))
+end
+@inline function DiffEqNoiseProcess.wiener_randn!(rng::AbstractRNG, rand_vec::Array{<:ReverseDiff.TrackedReal})
+    rand_vec .= ReverseDiff.track.(randn.((rng,), typeof.(DiffEqBase.value.(rand_vec))))
+end
+@inline function DiffEqNoiseProcess.wiener_randn!(rng::AbstractRNG, rand_vec::AbstractArray{<:ReverseDiff.TrackedReal})
+    rand_vec .= ReverseDiff.track.(randn.((rng,), typeof.(DiffEqBase.value.(rand_vec))))
+end
\ No newline at end of file
diff --git a/src/tracker.jl b/src/tracker.jl
new file mode 100644
index 000000000..7a84b84f2
--- /dev/null
+++ b/src/tracker.jl
@@ -0,0 +1,65 @@
+# Piracy that used to be requires, allowing Tracker.jl to be specialized for SciML
+
+function RecursiveArrayTools.recursivecopy!(b::AbstractArray{T,N}, a::AbstractArray{T2,N}) where {T<:Tracker.TrackedArray,T2<:Tracker.TrackedArray,N}
+    @inbounds for i in eachindex(a)
+        b[i] = copy(a[i])
+    end
+end
+
+DiffEqBase.value(x::Type{Tracker.TrackedReal{T}}) where {T} = T
+DiffEqBase.value(x::Type{Tracker.TrackedArray{T,N,A}}) where {T,N,A} = Array{T,N}
+DiffEqBase.value(x::Tracker.TrackedReal) = x.data
+DiffEqBase.value(x::Tracker.TrackedArray) = x.data
+
+DiffEqBase.promote_u0(u0::Tracker.TrackedArray, p::Tracker.TrackedArray, t0) = u0
+DiffEqBase.promote_u0(u0::AbstractArray{<:Tracker.TrackedReal}, p::Tracker.TrackedArray, t0) = u0
+DiffEqBase.promote_u0(u0::Tracker.TrackedArray, p::AbstractArray{<:Tracker.TrackedReal}, t0) = u0
+DiffEqBase.promote_u0(u0::AbstractArray{<:Tracker.TrackedReal}, p::AbstractArray{<:Tracker.TrackedReal}, t0) = u0
+DiffEqBase.promote_u0(u0, p::Tracker.TrackedArray, t0) = Tracker.track(u0)
+DiffEqBase.promote_u0(u0, p::AbstractArray{<:Tracker.TrackedReal}, t0) = eltype(p).(u0)
+
+
+@inline DiffEqBase.fastpow(x::Tracker.TrackedReal, y::Tracker.TrackedReal) = x^y
+@inline Base.any(f::Function, x::Tracker.TrackedArray) = any(f, Tracker.data(x))
+
+# Support adaptive with non-tracked time
+@inline function DiffEqBase.ODE_DEFAULT_NORM(u::Tracker.TrackedArray, t) where {N}
+    sqrt(sum(abs2, DiffEqBase.value(u)) / length(u))
+end
+@inline function DiffEqBase.ODE_DEFAULT_NORM(u::AbstractArray{<:Tracker.TrackedReal,N}, t) where {N}
+    sqrt(sum(x -> DiffEqBase.ODE_DEFAULT_NORM(x[1], x[2]), zip((DiffEqBase.value(x) for x in u), Iterators.repeated(t))) / length(u))
+end
+@inline function DiffEqBase.ODE_DEFAULT_NORM(u::Array{<:Tracker.TrackedReal,N}, t) where {N}
+    sqrt(sum(x -> DiffEqBase.ODE_DEFAULT_NORM(x[1], x[2]), zip((DiffEqBase.value(x) for x in u), Iterators.repeated(t))) / length(u))
+end
+@inline DiffEqBase.ODE_DEFAULT_NORM(u::Tracker.TrackedReal, t) = abs(DiffEqBase.value(u))
+
+# Support TrackedReal time, don't drop tracking on the adaptivity there
+@inline function DiffEqBase.ODE_DEFAULT_NORM(u::Tracker.TrackedArray, t::Tracker.TrackedReal) where {N}
+    sqrt(sum(abs2, u) / length(u))
+end
+@inline function DiffEqBase.ODE_DEFAULT_NORM(u::AbstractArray{<:Tracker.TrackedReal,N}, t::Tracker.TrackedReal) where {N}
+    sqrt(sum(x -> DiffEqBase.ODE_DEFAULT_NORM(x[1], x[2]), zip(u, Iterators.repeated(t))) / length(u))
+end
+@inline function DiffEqBase.ODE_DEFAULT_NORM(u::Array{<:Tracker.TrackedReal,N}, t::Tracker.TrackedReal) where {N}
+    sqrt(sum(x -> DiffEqBase.ODE_DEFAULT_NORM(x[1], x[2]), zip(u, Iterators.repeated(t))) / length(u))
+end
+@inline DiffEqBase.ODE_DEFAULT_NORM(u::Tracker.TrackedReal, t::Tracker.TrackedReal) = abs(u)
+
+function DiffEqBase.solve_up(prob::DiffEqBase.DEProblem, sensealg::Union{DiffEqBase.AbstractSensitivityAlgorithm,Nothing}, u0::Tracker.TrackedArray, p::Tracker.TrackedArray, args...; kwargs...)
+    Tracker.track(solve_up, prob, sensealg, u0, p, args...; kwargs...)
+end
+
+function DiffEqBase.solve_up(prob::DiffEqBase.DEProblem, sensealg::Union{DiffEqBase.AbstractSensitivityAlgorithm,Nothing}, u0::Tracker.TrackedArray, p, args...; kwargs...)
+    Tracker.track(solve_up, prob, sensealg, u0, p, args...; kwargs...)
+end
+
+function DiffEqBase.solve_up(prob::DiffEqBase.DEProblem, sensealg::Union{DiffEqBase.AbstractSensitivityAlgorithm,Nothing}, u0, p::Tracker.TrackedArray, args...; kwargs...)
+    Tracker.track(solve_up, prob, sensealg, u0, p, args...; kwargs...)
+end
+
+Tracker.@grad function DiffEqBase.solve_up(prob, sensealg::Union{Nothing,DiffEqBase.AbstractSensitivityAlgorithm},
+    u0, p, args...;
+    kwargs...)
+    _solve_adjoint(prob, sensealg, Tracker.data(u0), Tracker.data(p), args...; kwargs...)
+end
diff --git a/src/zygote.jl b/src/zygote.jl
new file mode 100644
index 000000000..9c4a6e9d1
--- /dev/null
+++ b/src/zygote.jl
@@ -0,0 +1,41 @@
+# Piracy that used to be requires, allowing Zyogote.jl to be specialized for SciML
+
+function ∇tmap(cx, f, args...)
+    ys_and_backs = SciMLBase.tmap((args...) -> Zygote._pullback(cx, f, args...), args...)
+    if isempty(ys_and_backs)
+        ys_and_backs, _ -> (NoTangent(), NoTangent())
+    else
+        ys, backs = Zygote.unzip(ys_and_backs)
+        function ∇tmap_internal(Δ)
+            Δf_and_args_zipped = SciMLBase.tmap((f, δ) -> f(δ), backs, Δ)
+            Δf_and_args = Zygote.unzip(Δf_and_args_zipped)
+            Δf = reduce(Zygote.accum, Δf_and_args[1])
+            (Δf, Δf_and_args[2:end]...)
+        end
+        ys, ∇tmap_internal
+    end
+end
+
+function ∇responsible_map(cx, f, args...)
+    ys_and_backs = SciMLBase.responsible_map((args...) -> Zygote._pullback(cx, f, args...), args...)
+    if isempty(ys_and_backs)
+        ys_and_backs, _ -> (NoTangent(), NoTangent())
+    else
+        ys, backs = Zygote.unzip(ys_and_backs)
+        ys, function ∇responsible_map_internal(Δ)
+            # Apply pullbacks in reverse order. Needed for correctness if `f` is stateful.
+            Δf_and_args_zipped = SciMLBase.responsible_map((f, δ) -> f(δ), Zygote._tryreverse(SciMLBase.responsible_map, backs, Δ)...)
+            Δf_and_args = Zygote.unzip(Zygote._tryreverse(SciMLBase.responsible_map, Δf_and_args_zipped))
+            Δf = reduce(Zygote.accum, Δf_and_args[1])
+            (Δf, Δf_and_args[2:end]...)
+        end
+    end
+end
+
+ZygoteRules.@adjoint function SciMLBase.tmap(f, args::Union{AbstractArray,Tuple}...)
+    ∇tmap(__context__, f, args...)
+end
+
+ZygoteRules.@adjoint function SciMLBase.responsible_map(f, args::Union{AbstractArray,Tuple}...)
+    ∇responsible_map(__context__, f, args...)
+end
\ No newline at end of file