diff --git a/ext/PreallocationToolsForwardDiffExt.jl b/ext/PreallocationToolsForwardDiffExt.jl
index 971fc67..39102a7 100644
--- a/ext/PreallocationToolsForwardDiffExt.jl
+++ b/ext/PreallocationToolsForwardDiffExt.jl
@@ -1,10 +1,9 @@
 module PreallocationToolsForwardDiffExt
 
 using PreallocationTools
-using ForwardDiff
-using ArrayInterface
-using Adapt
-using PrecompileTools
+using ForwardDiff: ForwardDiff
+using ArrayInterface: ArrayInterface
+using PrecompileTools: @setup_workload, @compile_workload
 
 function PreallocationTools.dualarraycreator(
         u::AbstractArray{T}, siz,
@@ -72,7 +71,7 @@ function replace_type_parameter(::Type{T}, ::Type{From}, ::Type{To}) where {T, F
         parameter isa Type ? replace_type_parameter(parameter, From, To) : parameter
     end
 
-    return new_parameters == parameters ? T : Core.apply_type(wrapper, new_parameters...)
+    return new_parameters == parameters ? T : wrapper{new_parameters...}
 end
 
 function diffcache_dual_tmp(dc::PreallocationTools.DiffCache, ::Type{T}) where {T <: ForwardDiff.Dual}
diff --git a/test/qa/Project.toml b/test/qa/Project.toml
index c1e9b2d..6f2e1d2 100644
--- a/test/qa/Project.toml
+++ b/test/qa/Project.toml
@@ -1,15 +1,23 @@
 [deps]
 AllocCheck = "9b6a8646-10ed-4001-bbdc-1d2f46dfbb1a"
 Aqua = "4c88cf16-eb10-579e-8560-4a9242c79595"
+EnzymeCore = "f151be2c-9106-41f4-ab19-57ee4f262869"
+ForwardDiff = "f6369f11-7733-5829-9624-2563aa707210"
 PreallocationTools = "d236fae5-4411-538c-8e31-a6e3d9e00b46"
+ReverseDiff = "37e2e3b7-166d-5795-8a7a-e32c996b4267"
 SafeTestsets = "1bc83da4-3b8d-516f-aca4-4fe02f6d838f"
 SciMLTesting = "09d9d899-5365-40a9-917a-5f67fddea283"
+SparseConnectivityTracer = "9f842d2f-2579-4b1d-911e-f412cf18a3f5"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [compat]
 AllocCheck = "0.2"
 Aqua = "0.8.11"
+EnzymeCore = "0.8"
+ForwardDiff = "0.10.38, 1.0.1"
+ReverseDiff = "1.16"
 SafeTestsets = "0.1, 1"
 SciMLTesting = "2.4"
+SparseConnectivityTracer = "1"
 Test = "1.10"
 julia = "1.10"
diff --git a/test/qa/qa.jl b/test/qa/qa.jl
index 862e382..6947d00 100644
--- a/test/qa/qa.jl
+++ b/test/qa/qa.jl
@@ -1,6 +1,48 @@
 using SciMLTesting, PreallocationTools, Test
 
-run_qa(PreallocationTools)
+# ExplicitImports only checks an extension module once it has been loaded, which
+# requires its trigger package to be present. Loading every weakdep here puts all
+# four extensions under the QA checks.
+using EnzymeCore, ForwardDiff, ReverseDiff, SparseConnectivityTracer
+
+run_qa(
+    PreallocationTools;
+    ei_kwargs = (;
+        all_explicit_imports_are_public = (;
+            ignore = (
+                # EnzymeCore neither exports nor declares `EnzymeRules` public,
+                # yet the submodule is the only entry point for defining Enzyme
+                # custom rules.
+                :EnzymeRules,
+                # SparseConnectivityTracer exports only its detectors and
+                # sparsity entry points. `AbstractTracer` and `Dual` are the
+                # types a `get_tmp` method has to dispatch on for sparsity
+                # detection to reach the cache, and neither has a public name.
+                :AbstractTracer, :Dual,
+            ),
+        ),
+        all_qualified_accesses_are_public = (;
+            ignore = (
+                # `EnzymeCore.EnzymeRules` declares `forward`,
+                # `augmented_primal` and `reverse` as bare `function ... end`
+                # stubs without exporting them. Adding methods to them is the
+                # documented way to write a custom rule.
+                :forward, :augmented_primal, :reverse,
+                # ForwardDiff exports only `DiffResults`. `Dual` is the type
+                # every dual-cache method dispatches on and `pickchunksize` is
+                # the chunk heuristic the cache sizing mirrors.
+                :Dual, :pickchunksize,
+                # ReverseDiff likewise exports only `DiffResults`;
+                # `TrackedArray` is the type the LazyBufferCache method keys on.
+                :TrackedArray,
+                # `Base.typename` is the only way to recover a DataType's
+                # UnionAll wrapper so its type parameters can be substituted;
+                # Base offers no public equivalent.
+                :typename,
+            ),
+        ),
+    )
+)
 
 @testset "AllocCheck" begin
     include("allocation_tests.jl")