diff --git a/Project.toml b/Project.toml
index c73a4b0..09d56c5 100644
--- a/Project.toml
+++ b/Project.toml
@@ -12,11 +12,12 @@ ArgTools = "1.1"
 julia = "1.3"
 
 [extras]
+CodecZlib = "944b1d66-785c-5afd-91f1-9de20f533193"
+Downloads = "f43a241f-c20a-4ad4-852c-f6b1247861c6"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 SimpleBufferStream = "777ac1f9-54b0-4bf8-805c-2214025038e7"
 Tar_jll = "9b64493d-8859-5bf3-93d7-7c32dd38186f"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
-CodecZlib = "944b1d66-785c-5afd-91f1-9de20f533193"
 
 [targets]
-test = ["Random", "SimpleBufferStream", "Tar_jll", "Test", "CodecZlib"]
+test = ["Random", "SimpleBufferStream", "Tar_jll", "Test", "CodecZlib", "Downloads"]
diff --git a/test/data/iso_codes.v4.11.0.any.tar.gz b/test/data/iso_codes.v4.11.0.any.tar.gz
deleted file mode 100644
index ea93091..0000000
Binary files a/test/data/iso_codes.v4.11.0.any.tar.gz and /dev/null differ
diff --git a/test/runtests.jl b/test/runtests.jl
index aa83e87..8dfe365 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -96,10 +96,11 @@ end
                 Tar.tree_hash(hdr->false, tar, algorithm="git-sha256", copy_symlinks=true)
         end
         NON_STDLIB_TESTS && begin
-            open(GzipDecompressorStream, "data/iso_codes.v4.11.0.any.tar.gz") do io
+            iso_codes_tarball = Downloads.download("https://github.com/JuliaBinaryWrappers/iso_codes_jll.jl/releases/download/iso_codes-v4.11.0+0/iso_codes.v4.11.0.any.tar.gz")
+            open(GzipDecompressorStream, iso_codes_tarball) do io
                 @test Tar.tree_hash(io) == "71f68a3d55d73f2e15a3969c241fae2349b1feb5"
             end
-            open(GzipDecompressorStream, "data/iso_codes.v4.11.0.any.tar.gz") do io
+            open(GzipDecompressorStream, iso_codes_tarball) do io
                 @test Tar.tree_hash(io; copy_symlinks=true) == "409d6ac4c02dae43ff4fe576b5c5820d0386fb3f"
             end
         end
diff --git a/test/setup.jl b/test/setup.jl
index 38e200c..3f2fc0a 100644
--- a/test/setup.jl
+++ b/test/setup.jl
@@ -11,6 +11,7 @@ const NON_STDLIB_TESTS = Main == @__MODULE__
 if NON_STDLIB_TESTS
     using SimpleBufferStream
     using CodecZlib
+    using Downloads
 
     using Tar_jll
     if isdefined(Tar_jll, :tar)