diff --git a/test/to_vec.jl b/test/to_vec.jl
index 18d88f2..59ea4ec 100644
--- a/test/to_vec.jl
+++ b/test/to_vec.jl
@@ -109,9 +109,11 @@ end
 
         @testset "Tuples" begin
             test_to_vec((5, 4))
-            test_to_vec((5, randn(T, 5)); check_inferred = VERSION ≥ v"1.2")
+            # TODO remove "< 1.6" once https://github.com/JuliaLang/julia/issues/40277
+            test_to_vec((5, randn(T, 5)); check_inferred = VERSION ≥ v"1.2" && VERSION < v"1.6")
             test_to_vec((randn(T, 4), randn(T, 4, 3, 2), 1); check_inferred = false)
-            test_to_vec((5, randn(T, 4, 3, 2), UpperTriangular(randn(T, 4, 4)), 2.5); check_inferred = VERSION ≥ v"1.2")
+            # TODO remove "< 1.6" once https://github.com/JuliaLang/julia/issues/40277
+            test_to_vec((5, randn(T, 4, 3, 2), UpperTriangular(randn(T, 4, 4)), 2.5); check_inferred = VERSION ≥ v"1.2" && VERSION < v"1.6")
             test_to_vec(((6, 5), 3, randn(T, 3, 2, 0, 1)); check_inferred = false)
             test_to_vec((DummyType(randn(T, 2, 7)), DummyType(randn(T, 3, 9))))
             test_to_vec((DummyType(randn(T, 3, 2)), randn(T, 11, 8)))
@@ -157,7 +159,8 @@ end
 
             @testset "Struct" begin
                 test_to_vec(Composite{ThreeFields}(; a=10.0, b=20.0, c=30.0))
-                test_to_vec(Composite{ThreeFields}(; a=10.0, b=20.0,))
+                # TODO remove "< 1.6" once https://github.com/JuliaLang/julia/issues/40277
+                test_to_vec(Composite{ThreeFields}(; a=10.0, b=20.0,), check_inferred = VERSION < v"1.6")
                 test_to_vec(Composite{ThreeFields}(; a=10.0, c=30.0))
                 test_to_vec(Composite{ThreeFields}(; c=30.0, a=10.0, b=20.0))
             end