diff --git a/internal/rosa/zlib.go b/internal/rosa/zlib.go
index 6cbf3b9..3bd5f46 100644
--- a/internal/rosa/zlib.go
+++ b/internal/rosa/zlib.go
@@ -8,7 +8,7 @@ func (t Toolchain) newZlib() (pkg.Artifact, string) {
 		checksum = "E-eIpNzE8oJ5DsqH4UuA_0GDKuQF5csqI8ooDx2w7Vx-woJ2mb-YtSbEyIMN44mH"
 	)
 	return t.NewPackage("zlib", version, pkg.NewHTTPGetTar(
-		nil, "https://zlib.net/zlib-"+version+".tar.gz",
+		nil, "https://www.zlib.net/fossils/zlib-"+version+".tar.gz",
 		mustDecode(checksum),
 		pkg.TarGzip,
 	), &PackageAttr{