diff --git a/src/DiffEqCallbacks.jl b/src/DiffEqCallbacks.jl
index 0d6c4818..407fa71e 100644
--- a/src/DiffEqCallbacks.jl
+++ b/src/DiffEqCallbacks.jl
@@ -2,32 +2,46 @@ module DiffEqCallbacks
 
 using ConcreteStructs: @concrete
 using DataStructures: DataStructures, BinaryMaxHeap, BinaryMinHeap
-using DiffEqBase: DiffEqBase, get_tstops, get_tstops_array, get_tstops_max
+using DiffEqBase: get_tstops, get_tstops_array, get_tstops_max
 using DifferentiationInterface: DifferentiationInterface, Constant
-using LinearAlgebra: LinearAlgebra, adjoint, axpy!, copyto!, diagind, mul!, ldiv!
+using LinearAlgebra: LinearAlgebra, adjoint, axpy!, copyto!, diagind, mul!
 using Markdown: @doc_str
 using PrecompileTools: PrecompileTools
 using RecipesBase: @recipe
 using RecursiveArrayTools: RecursiveArrayTools, DiffEqArray, copyat_or_push!
-using SciMLBase: SciMLBase, CallbackSet, DiscreteCallback, NonlinearFunction,
-    NonlinearLeastSquaresProblem, NonlinearProblem, RODEProblem,
+using SciMLBase: SciMLBase, CallbackSet, DiscreteCallback, DiscreteProblem,
+    NonlinearFunction, NonlinearProblem, RODEProblem,
     ReturnCode, SDEProblem, add_tstop!, check_error, get_du,
-    get_proposed_dt, get_tmp_cache, init, reinit!,
-    set_proposed_dt!, solve!, terminate!
+    get_proposed_dt, get_tmp_cache,
+    set_proposed_dt!, terminate!
 using StaticArraysCore: StaticArraysCore
 
 # SciMLBase v3 renamed `u_modified!` → `derivative_discontinuity!` (with
 # an `@deprecate` on the old name). Support both SciMLBase v2 and v3 by
-# aliasing to whichever name the loaded SciMLBase provides.
-@static if isdefined(SciMLBase, :derivative_discontinuity!)
-    using SciMLBase: derivative_discontinuity!
+# binding a const to whichever name the loaded SciMLBase provides. Both
+# `derivative_discontinuity!` and `u_modified!` are public in their
+# respective SciMLBase versions, so the qualified access is to public API; a
+# `const` (rather than a `using` import on one branch) keeps the name a single
+# local binding and avoids a stale-import false positive.
+const derivative_discontinuity! = if isdefined(SciMLBase, :derivative_discontinuity!)
+    SciMLBase.derivative_discontinuity!
 else
-    const derivative_discontinuity! = SciMLBase.u_modified!
+    SciMLBase.u_modified!
 end
 
 const DI = DifferentiationInterface
 true_condition(u, t, integrator) = true
 
+# Local reproduction of SciMLBase's `_unwrap_val` (a leading-underscore internal
+# that will not be made public): pull the value out of a `Val`, pass anything
+# else through unchanged.
+_unwrap_val(B) = B
+_unwrap_val(::Val{B}) where {B} = B
+
+# No-op default `initialize` for `DiscreteCallback`, matching SciMLBase's
+# (non-public) `INITIALIZE_DEFAULT`: reset the derivative-discontinuity flag.
+INITIALIZE_DEFAULT(cb, u, t, integrator) = derivative_discontinuity!(integrator, false)
+
 include("functor_helpers.jl")
 include("autoabstol.jl")
 include("manifold.jl")
diff --git a/src/function_caller.jl b/src/function_caller.jl
index 2cdb98ce..32efd7cf 100644
--- a/src/function_caller.jl
+++ b/src/function_caller.jl
@@ -19,7 +19,7 @@ function (affect!::FunctionCallingAffect)(integrator, force_func = false)
         if curt != integrator.t # If <t, interpolate
             if integrator isa SciMLBase.AbstractODEIntegrator
                 # Expand lazy dense for interpolation
-                DiffEqBase.addsteps!(integrator)
+                SciMLBase.addsteps!(integrator)
             end
             if integrator.u isa Union{Number, StaticArraysCore.SArray}
                 curu = integrator(curt)
diff --git a/src/integrating.jl b/src/integrating.jl
index 54fec52e..770dc2c0 100644
--- a/src/integrating.jl
+++ b/src/integrating.jl
@@ -181,7 +181,7 @@ function (affect!::SavingIntegrandAffect)(integrator)
     for i in 1:n
         t_temp = ((integrator.t - integrator.tprev) / 2) * gauss_points[n][i] +
             (integrator.t + integrator.tprev) / 2
-        if DiffEqBase.isinplace(integrator.sol.prob)
+        if SciMLBase.isinplace(integrator.sol.prob)
             curu = first(get_tmp_cache(integrator))
             integrator(curu, t_temp)
             if affect!.integrand_cache == nothing
diff --git a/src/integrating_GK_affect.jl b/src/integrating_GK_affect.jl
index 29d4b203..dc2c1ad8 100644
--- a/src/integrating_GK_affect.jl
+++ b/src/integrating_GK_affect.jl
@@ -178,7 +178,7 @@ function integrate_gk!(
     affect!.gk_err_cache = recursive_zero!(affect!.gk_err_cache)
     for i in 1:(2 * order + 1)
         t_temp = (gk_points[order][i] + 1) * ((bound_r - bound_l) / 2) + bound_l
-        if DiffEqBase.isinplace(integrator.sol.prob)
+        if SciMLBase.isinplace(integrator.sol.prob)
             curu = first(get_tmp_cache(integrator))
             integrator(curu, t_temp)
             if affect!.integrand_cache == nothing
diff --git a/src/integrating_GK_sum.jl b/src/integrating_GK_sum.jl
index 26735201..5ebbcdcd 100644
--- a/src/integrating_GK_sum.jl
+++ b/src/integrating_GK_sum.jl
@@ -19,7 +19,7 @@ function integrate_gk!(
     )
     affect!.gk_step_cache = recursive_zero!(affect!.gk_step_cache)
     affect!.gk_err_cache = recursive_zero!(affect!.gk_err_cache)
-    isinplace_prob = DiffEqBase.isinplace(integrator.sol.prob)
+    isinplace_prob = SciMLBase.isinplace(integrator.sol.prob)
     inplace_integrand = affect!.integrand_inplace === nothing ?
         (isinplace_prob && affect!.integrand_cache !== nothing) :
         affect!.integrand_inplace
diff --git a/src/integrating_sum.jl b/src/integrating_sum.jl
index d69b2266..02d8bef2 100644
--- a/src/integrating_sum.jl
+++ b/src/integrating_sum.jl
@@ -88,7 +88,7 @@ function (affect!::SavingIntegrandSumAffect)(integrator)
         n = div(SciMLBase.alg_order(integrator.alg) + 1, 2)
     end
     accumulation_cache = recursive_zero!(affect!.accumulation_cache)
-    isinplace_prob = DiffEqBase.isinplace(integrator.sol.prob)
+    isinplace_prob = SciMLBase.isinplace(integrator.sol.prob)
     inplace_integrand = affect!.integrand_inplace === nothing ?
         (isinplace_prob && affect!.integrand_cache !== nothing) :
         affect!.integrand_inplace
diff --git a/src/manifold.jl b/src/manifold.jl
index 6b927183..0382703d 100644
--- a/src/manifold.jl
+++ b/src/manifold.jl
@@ -114,7 +114,7 @@ function (proj::ManifoldProjection)(integrator)
         return
     end
 
-    return SciMLBase.copyto!(integrator.u, u)
+    return copyto!(integrator.u, u)
 end
 
 function initialize_manifold_projection(cb, u, t, integrator)
@@ -152,7 +152,7 @@ export ManifoldProjection
 # wrapper for non-autonomous functions
 function wrap_autonomous_function(autonomous::Union{Val{true}, Val{false}}, g)
     g === nothing && return nothing
-    return TypedNonAutonomousFunction{SciMLBase._unwrap_val(autonomous)}(g, nothing)
+    return TypedNonAutonomousFunction{_unwrap_val(autonomous)}(g, nothing)
 end
 function wrap_autonomous_function(autonomous::Union{Bool, Nothing}, g)
     g === nothing && return nothing
diff --git a/src/preset_time.jl b/src/preset_time.jl
index 3b7e3f95..9bc8fbb1 100644
--- a/src/preset_time.jl
+++ b/src/preset_time.jl
@@ -34,7 +34,7 @@ end
 """
 ```julia
 PresetTimeCallback(tstops, user_affect!;
-    initialize = DiffEqBase.INITIALIZE_DEFAULT,
+    initialize = INITIALIZE_DEFAULT,
     filter_tstops = true,
     kwargs...)
 ```
@@ -55,7 +55,7 @@ automatic.
 """
 function PresetTimeCallback(
         tstops, user_affect!;
-        initialize = SciMLBase.INITIALIZE_DEFAULT,
+        initialize = INITIALIZE_DEFAULT,
         filter_tstops = true,
         sort_inplace = false, kwargs...
     )
diff --git a/src/saving.jl b/src/saving.jl
index 765c7036..25efa467 100644
--- a/src/saving.jl
+++ b/src/saving.jl
@@ -52,9 +52,9 @@ function (affect!::SavingAffect)(integrator, force_save = false)
         if curt != integrator.t # If <t, interpolate
             if integrator isa SciMLBase.AbstractODEIntegrator
                 # Expand lazy dense for interpolation
-                DiffEqBase.addsteps!(integrator)
+                SciMLBase.addsteps!(integrator)
             end
-            if !DiffEqBase.isinplace(integrator.sol.prob)
+            if !SciMLBase.isinplace(integrator.sol.prob)
                 curu = integrator(curt)
             else
                 curu = first(get_tmp_cache(integrator))
diff --git a/src/terminatesteadystate.jl b/src/terminatesteadystate.jl
index 1e0e9cf2..91cca09c 100644
--- a/src/terminatesteadystate.jl
+++ b/src/terminatesteadystate.jl
@@ -8,23 +8,23 @@ function allDerivPass(integrator, abstol, reltol, min_t)
     end
 
     testval = if integrator.sol.prob isa DiscreteProblem
-        if DiffEqBase.isinplace(integrator.sol.prob)
+        if SciMLBase.isinplace(integrator.sol.prob)
             testval = first(get_tmp_cache(integrator))
             @. testval = integrator.u - integrator.uprev
         else
             testval = integrator.u .- integrator.uprev
         end
     else
-        if DiffEqBase.isinplace(integrator.sol.prob)
+        if SciMLBase.isinplace(integrator.sol.prob)
             testval = first(get_tmp_cache(integrator))
-            DiffEqBase.get_du!(testval, integrator)
-            if integrator.sol.prob isa DiffEqBase.DiscreteProblem
+            SciMLBase.get_du!(testval, integrator)
+            if integrator.sol.prob isa SciMLBase.DiscreteProblem
                 @. testval = testval - integrator.u
             end
             testval
         else
             testval = get_du(integrator)
-            if integrator.sol.prob isa DiffEqBase.DiscreteProblem
+            if integrator.sol.prob isa SciMLBase.DiscreteProblem
                 testval = testval - integrator.u
             end
             testval
diff --git a/test/qa/Project.toml b/test/qa/Project.toml
index cb4fd96e..9c6e0602 100644
--- a/test/qa/Project.toml
+++ b/test/qa/Project.toml
@@ -2,9 +2,11 @@
 Aqua = "4c88cf16-eb10-579e-8560-4a9242c79595"
 DiffEqCallbacks = "459566f4-90b8-5000-8ac3-15dfb0a30def"
 JET = "c3a54625-cd67-489e-a8e7-0a5a0ff4e31b"
+SciMLTesting = "09d9d899-5365-40a9-917a-5f67fddea283"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [compat]
 Aqua = "0.8"
 JET = "0.9, 0.10, 0.11"
+SciMLTesting = "1.6"
 Test = "1"
diff --git a/test/qa/qa.jl b/test/qa/qa.jl
index e0c6d60d..82ff1c5d 100644
--- a/test/qa/qa.jl
+++ b/test/qa/qa.jl
@@ -1,14 +1,25 @@
-using DiffEqCallbacks, Aqua
-@testset "Aqua" begin
-    Aqua.find_persistent_tasks_deps(DiffEqCallbacks)
-    Aqua.test_ambiguities(DiffEqCallbacks, recursive = false)
-    Aqua.test_deps_compat(DiffEqCallbacks)
-    Aqua.test_piracies(
-        DiffEqCallbacks,
-        treat_as_own = []
-    )
-    Aqua.test_project_extras(DiffEqCallbacks)
-    Aqua.test_stale_deps(DiffEqCallbacks)
-    Aqua.test_unbound_args(DiffEqCallbacks)
-    Aqua.test_undefined_exports(DiffEqCallbacks)
-end
+using SciMLTesting, DiffEqCallbacks, Test
+
+run_qa(
+    DiffEqCallbacks;
+    explicit_imports = true,
+    # JET is covered by the curated `@test_opt` constructor type-stability checks in
+    # jet_tests.jl (which `run_qa`'s `JET.test_package` error analysis does not
+    # subsume); keep `run_qa`'s JET off so loading JET there does not auto-enable it.
+    jet = false,
+    ei_kwargs = (;
+        # The only remaining non-public qualified accesses are to concrete stdlib
+        # types used for method dispatch, for which there is no public spelling
+        # (verified on Julia 1.12):
+        #   `LinearAlgebra.QRCompactWY` — the concrete result type of `qr(A)` for a
+        #     dense matrix; `fact_successful` dispatches on it to read `.factors`.
+        #   `Base.RefValue`            — the concrete type behind `Ref`; used in a
+        #     parametric `NamedTuple` type alias where the abstract `Ref` will not do.
+        all_qualified_accesses_are_public = (;
+            ignore = (
+                :QRCompactWY,  # LinearAlgebra internal concrete factorization type
+                :RefValue,     # Base internal concrete Ref type
+            ),
+        ),
+    ),
+)