diff --git a/internal/rosa/libxslt.go b/internal/rosa/libxslt.go
index 40f65ff..827dc64 100644
--- a/internal/rosa/libxslt.go
+++ b/internal/rosa/libxslt.go
@@ -23,6 +23,7 @@ func (t Toolchain) newLibxslt() (pkg.Artifact, string) {
 		SkipCheck: true,
 	},
 		XZ,
+		Zlib,
 		Python,
 		PkgConfig,
 
diff --git a/internal/rosa/llvm.go b/internal/rosa/llvm.go
index 6a9532d..48cd20a 100644
--- a/internal/rosa/llvm.go
+++ b/internal/rosa/llvm.go
@@ -187,6 +187,7 @@ ln -s ld.lld /work/system/bin/ld
 		Append: cmakeAppend,
 		Script: script + attr.script,
 	},
+		Zlib,
 		Libffi,
 		Python,
 		Perl,
diff --git a/internal/rosa/meson.go b/internal/rosa/meson.go
index 9754ae9..ba97594 100644
--- a/internal/rosa/meson.go
+++ b/internal/rosa/meson.go
@@ -13,6 +13,7 @@ func (t Toolchain) newMeson() (pkg.Artifact, string) {
 		checksum = "w895BXF_icncnXatT_OLCFe2PYEtg4KrKooMgUYdN-nQVvbFX3PvYWHGEpogsHtd"
 	)
 	return t.New("meson-"+version, 0, []pkg.Artifact{
+		t.Load(Zlib),
 		t.Load(Python),
 		t.Load(Setuptools),
 	}, nil, nil, `
@@ -66,6 +67,7 @@ func (*MesonHelper) name(name, version string) string {
 // extra returns hardcoded meson runtime dependencies.
 func (*MesonHelper) extra(int) []PArtifact {
 	return []PArtifact{
+		Zlib,
 		Python,
 		Meson,
 		Ninja,
diff --git a/internal/rosa/python.go b/internal/rosa/python.go
index 937a508..631fe13 100644
--- a/internal/rosa/python.go
+++ b/internal/rosa/python.go
@@ -87,6 +87,7 @@ func newViaPip(
 			}
 
 			return t.New(name+"-"+version, 0, slices.Concat([]pkg.Artifact{
+				t.Load(Zlib),
 				t.Load(Python),
 			}, extraRes), nil, nil, `
 pip3 install \
@@ -112,6 +113,7 @@ func (t Toolchain) newSetuptools() (pkg.Artifact, string) {
 		checksum = "K9f8Yi7Gg95zjmQsE1LLw9UBb8NglI6EY6pQpdD6DM0Pmc_Td5w2qs1SMngTI6Jp"
 	)
 	return t.New("setuptools-"+version, 0, []pkg.Artifact{
+		t.Load(Zlib),
 		t.Load(Python),
 	}, nil, nil, `
 pip3 install \
diff --git a/internal/rosa/ssl.go b/internal/rosa/ssl.go
index 21d6c50..bcae918 100644
--- a/internal/rosa/ssl.go
+++ b/internal/rosa/ssl.go
@@ -93,6 +93,7 @@ func init() {
 
 func (t Toolchain) newNSSCACert() (pkg.Artifact, string) {
 	return t.New("nss-cacert", 0, []pkg.Artifact{
+		t.Load(Zlib),
 		t.Load(Bash),
 		t.Load(Python),
 
diff --git a/internal/rosa/stage0.go b/internal/rosa/stage0.go
index b579d39..652c9b6 100644
--- a/internal/rosa/stage0.go
+++ b/internal/rosa/stage0.go
@@ -15,6 +15,7 @@ func (t Toolchain) newStage0() (pkg.Artifact, string) {
 		runtimes,
 		clang,
 
+		t.Load(Zlib),
 		t.Load(Bzip2),
 
 		t.Load(Patch),