diff --git a/.github/workflows/Testing.yaml b/.github/workflows/Testing.yaml
index 224c879..48d03b6 100644
--- a/.github/workflows/Testing.yaml
+++ b/.github/workflows/Testing.yaml
@@ -13,7 +13,6 @@ jobs:
         version:
           - '1.7'
           - '1'
-          - '1.11.1'
           - 'nightly'
         os:
           - ubuntu-latest
diff --git a/perf/benchmark.jl b/perf/benchmark.jl
index 2b2312c..dcfb363 100644
--- a/perf/benchmark.jl
+++ b/perf/benchmark.jl
@@ -114,7 +114,8 @@ println("======= breakdown benchmark =======")
 x = rand(100000)
 tf = Libtask.TapedFunction(ackley, x, nothing)
 tf(x, nothing);
-ins = tf.tape[45]
+idx = findlast((x)->isa(x, Libtask.Instruction), tf.tape)
+ins = tf.tape[idx]
 b = ins.input[1]
 
 @show ins.input |> length