diff --git a/Project.toml b/Project.toml
index 374a9a7..955f7a2 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "Hankel"
 uuid = "74863788-d124-456e-a676-9b76578dd39e"
 authors = ["chrisbrahms <38351086+chrisbrahms@users.noreply.github.com>"]
-version = "0.5.5"
+version = "0.5.6"
 
 [deps]
 ChainRulesCore = "d360d2e6-b24c-11e9-a2a3-2a2ae2dbcce4"
@@ -11,7 +11,7 @@ Roots = "f2b01f46-fcfa-551c-844a-d8ac1e96c665"
 SpecialFunctions = "276daf66-3868-5448-9aa4-cd146d93841b"
 
 [compat]
-ChainRulesCore = "0.9.44, 0.10"
+ChainRulesCore = "0.9.44, 0.10, 1"
 GSL = "0.6, 1"
 Roots = "0.8, 1"
 SpecialFunctions = "0.10, 1"
diff --git a/src/Hankel.jl b/src/Hankel.jl
index 40b4610..6cdb9dd 100644
--- a/src/Hankel.jl
+++ b/src/Hankel.jl
@@ -12,6 +12,6 @@ const J₀₀ = besselj(0, 0)
 
 include("utils.jl")
 include("qdht.jl")
-include("diffrules.jl")
+include("chainrules.jl")
 
 end
diff --git a/src/diffrules.jl b/src/chainrules.jl
similarity index 81%
rename from src/diffrules.jl
rename to src/chainrules.jl
index aa38797..41405f5 100644
--- a/src/diffrules.jl
+++ b/src/chainrules.jl
@@ -14,20 +14,20 @@ function ChainRulesCore.rrule(::Type{T}, args...; kwargs...) where {T<:QDHT}
 end
 
 ## rules for fwd/rev transform
-ChainRulesCore.frule((_, _, ΔA), ::typeof(*), Q::QDHT, A) = (Q * A, Q * ΔA)
-ChainRulesCore.frule((_, _, ΔA), ::typeof(\), Q::QDHT, A) = (Q \ A, Q \ ΔA)
+ChainRulesCore.frule((_, _, ΔA), ::typeof(*), Q::QDHT, A) = (Q * A, Q * unthunk(ΔA))
+ChainRulesCore.frule((_, _, ΔA), ::typeof(\), Q::QDHT, A) = (Q \ A, Q \ unthunk(ΔA))
 function ChainRulesCore.frule((_, ΔY, _, ΔA), ::typeof(mul!), Y, Q::QDHT, A)
-    return mul!(Y, Q, A), mul!(ΔY, Q, ΔA)
+    return mul!(Y, Q, A), mul!(unthunk(ΔY), Q, unthunk(ΔA))
 end
 function ChainRulesCore.frule((_, ΔY, _, ΔA), ::typeof(ldiv!), Y, Q::QDHT, A)
-    return ldiv!(Y, Q, A), ldiv!(ΔY, Q, ΔA)
+    return ldiv!(Y, Q, A), ldiv!(unthunk(ΔY), Q, unthunk(ΔA))
 end
 
 function ChainRulesCore.rrule(::typeof(*), Q::QDHT, A)
     Y = Q * A
     function mul_pullback(ΔY)
         ∂Q = NoTangent()
-        ∂A = @thunk _mul_back(ΔY, Q, A, Q.scaleRK)
+        ∂A = _mul_back(unthunk(ΔY), Q, A, Q.scaleRK)
         return NoTangent(), ∂Q, ∂A
     end
     return Y, mul_pullback
@@ -37,7 +37,7 @@ function ChainRulesCore.rrule(::typeof(\), Q::QDHT, A)
     Y = Q \ A
     function ldiv_pullback(ΔY)
         ∂Q = NoTangent()
-        ∂A = @thunk _mul_back(ΔY, Q, A, inv(Q.scaleRK))
+        ∂A = _mul_back(unthunk(ΔY), Q, A, inv(Q.scaleRK))
         return NoTangent(), ∂Q, ∂A
     end
     return Y, ldiv_pullback
@@ -53,16 +53,16 @@ end
 
 ## rules for integrateR/integrateK
 function ChainRulesCore.frule((_, ΔA, _), ::typeof(integrateR), A, Q::QDHT; kwargs...)
-    return integrateR(A, Q; kwargs...), integrateR(ΔA, Q; kwargs...)
+    return integrateR(A, Q; kwargs...), integrateR(unthunk(ΔA), Q; kwargs...)
 end
 
 function ChainRulesCore.frule((_, ΔA, _), ::typeof(integrateK), A, Q::QDHT; kwargs...)
-    return integrateK(A, Q; kwargs...), integrateK(ΔA, Q; kwargs...)
+    return integrateK(A, Q; kwargs...), integrateK(unthunk(ΔA), Q; kwargs...)
 end
 
 function ChainRulesCore.rrule(::typeof(integrateR), A, Q::QDHT; dim = 1)
     function integrateR_pullback(ΔΩ)
-        ∂A = @thunk _integrateRK_back(ΔΩ, A, Q.scaleR; dim = dim)
+        ∂A = _integrateRK_back(unthunk(ΔΩ), A, Q.scaleR; dim = dim)
         return NoTangent(), ∂A, NoTangent()
     end
     return integrateR(A, Q; dim = dim), integrateR_pullback
@@ -70,7 +70,7 @@ end
 
 function ChainRulesCore.rrule(::typeof(integrateK), A, Q::QDHT; dim = 1)
     function integrateK_pullback(ΔΩ)
-        ∂A = @thunk _integrateRK_back(ΔΩ, A, Q.scaleK; dim = dim)
+        ∂A = _integrateRK_back(unthunk(ΔΩ), A, Q.scaleK; dim = dim)
         return NoTangent(), ∂A, NoTangent()
     end
     return integrateK(A, Q; dim = dim), integrateK_pullback
diff --git a/test/Project.toml b/test/Project.toml
index f8d171d..b0864a8 100644
--- a/test/Project.toml
+++ b/test/Project.toml
@@ -1,7 +1,6 @@
 [deps]
 ChainRulesCore = "d360d2e6-b24c-11e9-a2a3-2a2ae2dbcce4"
 ChainRulesTestUtils = "cdddcdb0-9152-4a09-a978-84456f9df70a"
-FiniteDifferences = "26cc04aa-876d-5657-8c51-4c34ba976000"
 HCubature = "19dc6840-f33b-545b-b366-655c7e3ffd49"
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
@@ -9,9 +8,8 @@ SpecialFunctions = "276daf66-3868-5448-9aa4-cd146d93841b"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [compat]
-ChainRulesCore = "0.9.44, 0.10"
-ChainRulesTestUtils = "0.7.8"
-FiniteDifferences = "0.12"
+ChainRulesCore = "0.9.44, 0.10, 1"
+ChainRulesTestUtils = "0.7.8, 1"
 HCubature = "1.4"
 SpecialFunctions = "0.10, 1"
 julia = "1"
diff --git a/test/diffrules.jl b/test/chainrules.jl
similarity index 100%
rename from test/diffrules.jl
rename to test/chainrules.jl
diff --git a/test/runtests.jl b/test/runtests.jl
index c65c282..07eaa12 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -3,7 +3,6 @@ using Hankel
 import LinearAlgebra: diagm, mul!, ldiv!
 import SpecialFunctions: besseli, besselix, besselj
 import HCubature: hquadrature
-using FiniteDifferences
 using Random
 using ChainRulesCore
 using ChainRulesTestUtils
@@ -95,4 +94,4 @@ end
 end
 
 include("qdht.jl")
-include("diffrules.jl")
+include("chainrules.jl")