diff --git a/Project.toml b/Project.toml
index f00a396..56ecf9c 100644
--- a/Project.toml
+++ b/Project.toml
@@ -17,10 +17,12 @@ TupleTools = "9d95972d-f1c8-5527-a6e0-b4b365fa01f6"
 [weakdeps]
 AMDGPU = "21141c5a-9bdb-4563-92ae-f87d6854732e"
 CUDA = "052768ef-5323-5732-b1bb-66c8b64840ba"
+Enzyme = "7da242da-08ed-463a-9acd-ee780be4f1d9"
 
 [extensions]
 AMDGPUExt = "AMDGPU"
 CUDAExt = "CUDA"
+EnzymeExt = "Enzyme"
 
 [compat]
 AMDGPU = "0.8"
@@ -29,6 +31,7 @@ BatchedRoutines = "0.2"
 CUDA = "4, 5"
 ChainRulesCore = "1"
 Combinatorics = "1.0"
+Enzyme = "0.13.16"
 MacroTools = "0.5"
 OMEinsumContractionOrders = "0.9"
 TupleTools = "1.2, 1.3"
@@ -49,4 +52,4 @@ TropicalNumbers = "b3a74e9c-7526-4576-a4eb-79c0d4c32334"
 Zygote = "e88e6eb3-aa80-5325-afca-941959d7151f"
 
 [targets]
-test = ["Test", "CUDA", "Documenter", "LinearAlgebra", "LuxorGraphPlot", "ProgressMeter", "SymEngine", "Random", "Zygote", "DoubleFloats", "TropicalNumbers", "ForwardDiff", "Polynomials"]
+test = ["Test", "CUDA", "Documenter", "Enzyme", "LinearAlgebra", "LuxorGraphPlot", "ProgressMeter", "SymEngine", "Random", "Zygote", "DoubleFloats", "TropicalNumbers", "ForwardDiff", "Polynomials"]
diff --git a/ext/EnzymeExt.jl b/ext/EnzymeExt.jl
new file mode 100644
index 0000000..f140935
--- /dev/null
+++ b/ext/EnzymeExt.jl
@@ -0,0 +1,40 @@
+module EnzymeExt
+using Enzyme.EnzymeRules, OMEinsum, Enzyme
+using OMEinsum: get_size_dict!
+
+function EnzymeRules.augmented_primal(
+        config::EnzymeRules.RevConfigWidth{1},
+        func::Const{typeof(einsum!)}, ::Type, 
+        code::Const, xs::Duplicated, ys::Duplicated, sx::Const, sy::Const, size_dict::Const)
+    @assert sx.val == 1 && sy.val == 0 "Only α = 1 and β = 0 is supported, got: $sx, $sy"
+    # Compute primal
+    if EnzymeRules.needs_primal(config)
+        primal = func.val(code.val, xs.val, ys.val, sx.val, sy.val, size_dict.val)
+    else
+        primal = nothing
+    end
+    # Save x in tape if x will be overwritten
+    if EnzymeRules.overwritten(config)[3]
+        tape = copy(xs.val)
+    else
+        tape = nothing
+    end
+    shadow = ys.dval
+    return EnzymeRules.AugmentedReturn(primal, shadow, tape)
+end
+
+function EnzymeRules.reverse(config::EnzymeRules.RevConfigWidth{1},
+               func::Const{typeof(einsum!)}, dret::Type{<:Annotation}, tape,
+               code::Const,
+               xs::Duplicated, ys::Duplicated, sx::Const, sy::Const, size_dict::Const)
+   xval = EnzymeRules.overwritten(config)[3] ? tape : xs.val
+   for i=1:length(xs.val)
+       xs.dval[i] .+= OMEinsum.einsum_grad(OMEinsum.getixs(code.val),
+             xval, OMEinsum.getiy(code.val), size_dict.val, conj(ys.dval), i)
+   end
+   return (nothing, nothing, nothing, nothing, nothing, nothing)
+end
+
+# EnzymeRules.inactive(::typeof(get_size_dict!), args...) = nothing
+
+end
\ No newline at end of file
diff --git a/test/EnzymeExt.jl b/test/EnzymeExt.jl
new file mode 100644
index 0000000..6a16c5a
--- /dev/null
+++ b/test/EnzymeExt.jl
@@ -0,0 +1,70 @@
+using Enzyme, OMEinsum, Test
+function testf1(x)
+    y = zeros(size(x, 1))
+    einsum!(ein"ii->i", (x,), y, 1, 0, Dict('i'=>3))
+    return sum(y)
+end
+
+function testf2(x)
+    y = einsum(ein"ii->i", (x,), Dict('i'=>3))
+    return sum(y)
+end
+
+function testf4(x)
+    y = ein"ii->i"(x)
+    return sum(y)
+end
+
+@testset "EnzymeExt" begin
+    x = randn(3, 3);
+    gx = zero(x);
+
+    autodiff(ReverseWithPrimal, testf1, Active, Duplicated(x, gx))
+    @test gx == [1 0 0; 0 1 0; 0 0 1]
+
+    autodiff(ReverseWithPrimal, testf2, Active, Duplicated(x, gx))
+    @test gx == [2 0 0; 0 2 0; 0 0 2]
+
+    autodiff(ReverseWithPrimal, testf4, Active, Duplicated(x, gx))
+    @test gx == [3 0 0; 0 3 0; 0 0 3]
+end
+
+@testset "EnzymeExt error" begin
+    x = randn(3, 3);
+    gx = zero(x);
+    function testf3(x)
+        y = zeros(size(x, 1))
+        einsum!(ein"ii->i", (x,), y, 1, 0, Dict('i'=>3))
+        return sum(y)
+    end
+    autodiff(ReverseWithPrimal, testf3, Active, Duplicated(x, gx))
+    @test gx == [1 0 0; 0 1 0; 0 0 1]
+end
+
+@testset "EnzymeExt bp check" begin
+    A, B, C = randn(2, 3), randn(3, 4), randn(4, 2)
+    cost0 = ein"(ij, jk), ki->"(A, B, C)[]
+    gA = zero(A); gB = zero(B); gC = zero(C);
+    Enzyme.autodiff(Reverse, (a, b, c)->ein"(ij, jk), ki->"(a, b, c)[], Active, Duplicated(A, gA), Duplicated(B, gB), Duplicated(C, gC))
+    cost, mg = OMEinsum.cost_and_gradient(ein"(ij, jk), ki->", (A, B, C))
+    @test cost[] ≈ cost0
+    @test all(gA .≈ mg[1])
+    @test all(gB .≈ mg[2])
+    @test all(gC .≈ mg[3])
+end
+
+@testset "EnzymeExt bp check 2" begin
+    A, B, C = randn(2, 3), randn(3, 4), randn(4, 2)
+    code = optimize_code(ein"ij, jk, ki->", uniformsize(ein"ij, jk, ki->", 2), TreeSA())
+    cost0 = code(A, B, C)[]
+    gA = zero(A); gB = zero(B); gC = zero(C);
+    f(code, a, b, c) = code(a, b, c)[]
+    Enzyme.autodiff(set_runtime_activity(Reverse), f, Active, Const(code), Duplicated(A, gA), Duplicated(B, gB), Duplicated(C, gC))
+    cost, mg = OMEinsum.cost_and_gradient(code, (A, B, C))
+    @test cost[] ≈ cost0
+    @test all(gA .≈ mg[1])
+    @test all(gB .≈ mg[2])
+    @test all(gC .≈ mg[3])
+end
+
+# liquid state machine
\ No newline at end of file
diff --git a/test/runtests.jl b/test/runtests.jl
index e731b50..65b9c58 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -59,6 +59,10 @@ end
     include("bp.jl")
 end
 
+@testset "EnzymeExt" begin
+    include("EnzymeExt.jl")
+end
+
 @testset "docstring" begin
     Documenter.doctest(OMEinsum; manual=false)
 end