diff --git a/internal/rosa/zlib.go b/internal/rosa/zlib.go
index 9b1253a..3bd5f46 100644
--- a/internal/rosa/zlib.go
+++ b/internal/rosa/zlib.go
@@ -4,8 +4,8 @@ import "hakurei.app/internal/pkg"
 
 func (t Toolchain) newZlib() (pkg.Artifact, string) {
 	const (
-		version  = "1.3.2"
-		checksum = "KHZrePe42vL2XvOUE3KlJkp1UgWhWkl0jjT_BOvFhuM4GzieEH9S7CioepOFVGYB"
+		version  = "1.3.1"
+		checksum = "E-eIpNzE8oJ5DsqH4UuA_0GDKuQF5csqI8ooDx2w7Vx-woJ2mb-YtSbEyIMN44mH"
 	)
 	return t.NewPackage("zlib", version, pkg.NewHTTPGetTar(
 		nil, "https://www.zlib.net/fossils/zlib-"+version+".tar.gz",