diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 77f4247..9abdb8c 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -15,7 +15,7 @@ jobs:
       matrix:
         version:
           - '1.6'
-          - '1.8'
+          - '1.9'
         os:
           - ubuntu-latest
         arch:
diff --git a/Project.toml b/Project.toml
index 0fd92c2..0cd2931 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "Yota"
 uuid = "cd998857-8626-517d-b929-70ad188a48f0"
 authors = ["Andrei Zhabinski <andrei.zhabinski@gmail.com>"]
-version = "0.8.2"
+version = "0.8.3"
 
 [deps]
 ChainRules = "082447d4-558c-5d27-93f4-14fc19e9eca2"
@@ -20,5 +20,5 @@ ChainRules = "1.43"
 ChainRulesCore = "1.15"
 FiniteDifferences = "0.12"
 NNlib = "0.8"
-Umlaut = "0.4.8"
+Umlaut = "0.5.1"
 julia = "1.6"
diff --git a/src/grad.jl b/src/grad.jl
index 27509ec..3426f2d 100644
--- a/src/grad.jl
+++ b/src/grad.jl
@@ -10,7 +10,7 @@ function has_rrule(f, args...)
     F = Core.Typeof(f)
     Args = Core.Typeof.(args)
     Core.Compiler.return_type(rrule, Tuple{YotaRuleConfig, F, Args...}) !== Nothing && return true
-    if is_kwfunc(F)
+    if is_kwfunc(f)
         # must be: Tuple{Any, typeof(rrule), YotaRuleConfig, typeof(unkwfunc(f)), Args[3:end]...}
         nokw_f = unkwfunc(f, args...)
         Args_kwrrule = Tuple{Any, typeof(rrule), YotaRuleConfig, typeof(nokw_f), Args[3:end]...}
@@ -132,8 +132,11 @@ with the following chain or calls:
 where `val = fn(args...)` and `pb` is the pullback function.
 """
 function chainrules_transform!(tape::Tape)
+    # global TAPE = tape
+    # error("")
     i = 1
     while i <= length(tape)
+        # tape[V(i)] isa Call && tape[V(i)].fn == Core.kwcall && break
         op = tape[V(i)]
         if op isa Call && isprimitive(ChainRulesCtx(), call_values(op)...)
             # replace f(args...) with rrule(f, args...)
@@ -180,6 +183,7 @@ function step_back!(tape::Tape, y::Variable)
     end
     for (i, x) in enumerate(y_fargs)
         if x isa V
+            global STATE = (tape, y, y_fargs, i, x)
             dx = push!(tape, mkcall(getfield, dxs, i; line="d$y/d$x"))
             # @debug "Updating derivative: $x -> $dx"
             set_or_add_deriv!(tape, x, dx)
diff --git a/src/utils.jl b/src/utils.jl
index ecc6bc5..71df5d5 100644
--- a/src/utils.jl
+++ b/src/utils.jl
@@ -1,5 +1,9 @@
 # not the most robust function, but works in practise
-is_kwfunc(f) = (name = string(f); endswith(name, "##kw") || endswith(name, "##kw\""))
+if VERSION < v"1.9.0"
+    is_kwfunc(f) = (name = string(f); endswith(name, "##kw") || endswith(name, "##kw\""))
+else
+    is_kwfunc(f) = (f === Core.kwcall)
+end
 is_kwfunc(v::Variable) = is_kwfunc(v._op.val)
 
 function unkwfunc(f, args...)
diff --git a/test/Project.toml b/test/Project.toml
index 68924a4..6fc48f5 100644
--- a/test/Project.toml
+++ b/test/Project.toml
@@ -8,7 +8,7 @@ Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [compat]
-CUDA = "3"
+CUDA = "3, 4"
 ChainRules = "1"
 ChainRulesCore = "1"
 ChainRulesTestUtils = "1"
\ No newline at end of file