diff --git a/build.zig b/build.zig
index fc944059b..9281489e8 100644
--- a/build.zig
+++ b/build.zig
@@ -21,15 +21,16 @@ const harfbuzz = @import("pkg/harfbuzz/build.zig");
 const js = @import("vendor/zig-js/build.zig");
 const libxev = @import("vendor/libxev/build.zig");
 const libxml2 = @import("vendor/zig-libxml2/libxml2.zig");
-const libpng = @import("pkg/libpng/build.zig");
 const macos = @import("pkg/macos/build.zig");
 const objc = @import("vendor/zig-objc/build.zig");
 const pixman = @import("pkg/pixman/build.zig");
 const utf8proc = @import("pkg/utf8proc/build.zig");
-const zlib = @import("pkg/zlib/build.zig");
 const tracylib = @import("pkg/tracy/build.zig");
 const system_sdk = @import("vendor/mach-glfw/system_sdk.zig");
 
+const libpng = @import("pkg/libpng/build.old.zig");
+const zlib = @import("pkg/zlib/build.old.zig");
+
 // Do a comptime Zig version requirement. The required Zig version is
 // somewhat arbitrary: it is meant to be a version that we feel works well,
 // but we liberally update it. In the future, we'll be more careful about
diff --git a/pkg/libpng/build.old.zig b/pkg/libpng/build.old.zig
new file mode 100644
index 000000000..0e98059ac
--- /dev/null
+++ b/pkg/libpng/build.old.zig
@@ -0,0 +1,102 @@
+const std = @import("std");
+
+/// Directories with our includes.
+const root = thisDir() ++ "../../../vendor/libpng/";
+const include_path = root;
+const include_path_pnglibconf = thisDir();
+
+pub const include_paths = .{ include_path, include_path_pnglibconf };
+
+pub const pkg = std.build.Pkg{
+    .name = "libpng",
+    .source = .{ .path = thisDir() ++ "/main.zig" },
+};
+
+fn thisDir() []const u8 {
+    return std.fs.path.dirname(@src().file) orelse ".";
+}
+
+pub const Options = struct {
+    zlib: Zlib = .{},
+
+    pub const Zlib = struct {
+        step: ?*std.build.LibExeObjStep = null,
+        include: ?[]const []const u8 = null,
+    };
+};
+
+pub fn link(
+    b: *std.Build,
+    step: *std.build.LibExeObjStep,
+    opt: Options,
+) !*std.build.LibExeObjStep {
+    const lib = try buildLib(b, step, opt);
+    step.linkLibrary(lib);
+    step.addIncludePath(.{ .path = include_path });
+    return lib;
+}
+
+pub fn buildLib(
+    b: *std.Build,
+    step: *std.build.LibExeObjStep,
+    opt: Options,
+) !*std.build.LibExeObjStep {
+    const target = step.target;
+    const lib = b.addStaticLibrary(.{
+        .name = "png",
+        .target = step.target,
+        .optimize = step.optimize,
+    });
+
+    // Include
+    lib.addIncludePath(.{ .path = include_path });
+    lib.addIncludePath(.{ .path = include_path_pnglibconf });
+
+    // Link
+    lib.linkLibC();
+    if (target.isLinux()) {
+        lib.linkSystemLibrary("m");
+    }
+
+    if (opt.zlib.step) |zlib|
+        lib.linkLibrary(zlib)
+    else
+        lib.linkSystemLibrary("z");
+
+    if (opt.zlib.include) |dirs|
+        for (dirs) |dir| lib.addIncludePath(.{ .path = dir });
+
+    // Compile
+    var flags = std.ArrayList([]const u8).init(b.allocator);
+    defer flags.deinit();
+
+    try flags.appendSlice(&.{
+        "-DPNG_ARM_NEON_OPT=0",
+        "-DPNG_POWERPC_VSX_OPT=0",
+        "-DPNG_INTEL_SSE_OPT=0",
+        "-DPNG_MIPS_MSA_OPT=0",
+    });
+
+    // C files
+    lib.addCSourceFiles(srcs, flags.items);
+
+    return lib;
+}
+
+const srcs = &.{
+    root ++ "png.c",
+    root ++ "pngerror.c",
+    root ++ "pngget.c",
+    root ++ "pngmem.c",
+    root ++ "pngpread.c",
+    root ++ "pngread.c",
+    root ++ "pngrio.c",
+    root ++ "pngrtran.c",
+    root ++ "pngrutil.c",
+    root ++ "pngset.c",
+    root ++ "pngtrans.c",
+    root ++ "pngwio.c",
+    root ++ "pngwrite.c",
+    root ++ "pngwtran.c",
+    root ++ "pngwutil.c",
+};
diff --git a/pkg/libpng/build.zig b/pkg/libpng/build.zig
index 0e98059ac..f54c06893 100644
--- a/pkg/libpng/build.zig
+++ b/pkg/libpng/build.zig
@@ -1,102 +1,66 @@
 const std = @import("std");
 
-/// Directories with our includes.
-const root = thisDir() ++ "../../../vendor/libpng/";
-const include_path = root;
-const include_path_pnglibconf = thisDir();
+pub fn build(b: *std.Build) !void {
+    const target = b.standardTargetOptions(.{});
+    const optimize = b.standardOptimizeOption(.{});
 
-pub const include_paths = .{ include_path, include_path_pnglibconf };
+    const upstream = b.dependency("libpng", .{});
 
-pub const pkg = std.build.Pkg{
-    .name = "libpng",
-    .source = .{ .path = thisDir() ++ "/main.zig" },
-};
-
-fn thisDir() []const u8 {
-    return std.fs.path.dirname(@src().file) orelse ".";
-}
-
-pub const Options = struct {
-    zlib: Zlib = .{},
-
-    pub const Zlib = struct {
-        step: ?*std.build.LibExeObjStep = null,
-        include: ?[]const []const u8 = null,
-    };
-};
-
-pub fn link(
-    b: *std.Build,
-    step: *std.build.LibExeObjStep,
-    opt: Options,
-) !*std.build.LibExeObjStep {
-    const lib = try buildLib(b, step, opt);
-    step.linkLibrary(lib);
-    step.addIncludePath(.{ .path = include_path });
-    return lib;
-}
-
-pub fn buildLib(
-    b: *std.Build,
-    step: *std.build.LibExeObjStep,
-    opt: Options,
-) !*std.build.LibExeObjStep {
-    const target = step.target;
     const lib = b.addStaticLibrary(.{
         .name = "png",
-        .target = step.target,
-        .optimize = step.optimize,
+        .target = target,
+        .optimize = optimize,
     });
-
-    // Include
-    lib.addIncludePath(.{ .path = include_path });
-    lib.addIncludePath(.{ .path = include_path_pnglibconf });
-
-    // Link
     lib.linkLibC();
     if (target.isLinux()) {
         lib.linkSystemLibrary("m");
     }
 
-    if (opt.zlib.step) |zlib|
-        lib.linkLibrary(zlib)
-    else
-        lib.linkSystemLibrary("z");
+    const zlib_dep = b.dependency("zlib", .{ .target = target, .optimize = optimize });
+    lib.linkLibrary(zlib_dep.artifact("z"));
+    lib.addIncludePath(upstream.path(""));
+    lib.addIncludePath(.{ .path = "" });
 
-    if (opt.zlib.include) |dirs|
-        for (dirs) |dir| lib.addIncludePath(.{ .path = dir });
-
-    // Compile
     var flags = std.ArrayList([]const u8).init(b.allocator);
     defer flags.deinit();
-
     try flags.appendSlice(&.{
         "-DPNG_ARM_NEON_OPT=0",
         "-DPNG_POWERPC_VSX_OPT=0",
         "-DPNG_INTEL_SSE_OPT=0",
         "-DPNG_MIPS_MSA_OPT=0",
     });
+    for (srcs) |src| {
+        lib.addCSourceFile(.{
+            .file = upstream.path(src),
+            .flags = flags.items,
+        });
+    }
 
-    // C files
-    lib.addCSourceFiles(srcs, flags.items);
+    lib.installHeader("pnglibconf.h", "pnglibconf.h");
+    lib.installHeadersDirectoryOptions(.{
+        .source_dir = upstream.path(""),
+        .install_dir = .header,
+        .install_subdir = "",
+        .include_extensions = &.{".h"},
+    });
 
-    return lib;
+    b.installArtifact(lib);
 }
 
-const srcs = &.{
-    root ++ "png.c",
-    root ++ "pngerror.c",
-    root ++ "pngget.c",
-    root ++ "pngmem.c",
-    root ++ "pngpread.c",
-    root ++ "pngread.c",
-    root ++ "pngrio.c",
-    root ++ "pngrtran.c",
-    root ++ "pngrutil.c",
-    root ++ "pngset.c",
-    root ++ "pngtrans.c",
-    root ++ "pngwio.c",
-    root ++ "pngwrite.c",
-    root ++ "pngwtran.c",
-    root ++ "pngwutil.c",
+const srcs: []const []const u8 = &.{
+    "png.c",
+    "pngerror.c",
+    "pngget.c",
+    "pngmem.c",
+    "pngpread.c",
+    "pngread.c",
+    "pngrio.c",
+    "pngrtran.c",
+    "pngrutil.c",
+    "pngset.c",
+    "pngtrans.c",
+    "pngwio.c",
+    "pngwrite.c",
+    "pngwtran.c",
+    "pngwutil.c",
 };
diff --git a/pkg/libpng/build.zig.zon b/pkg/libpng/build.zig.zon
new file mode 100644
index 000000000..ebad1dcb4
--- /dev/null
+++ b/pkg/libpng/build.zig.zon
@@ -0,0 +1,14 @@
+.{
+    .name = "libpng",
+    .version = "1.6.40",
+    .dependencies = .{
+        .libpng = .{
+            .url = "https://github.com/glennrp/libpng/archive/refs/tags/v1.6.40.tar.gz",
+            .hash = "12203d2722e3af6f9556503b114c25fe3eead528a93f5f26eefcb187a460d1548e07",
+        },
+
+        .zlib = .{
+            .path = "../zlib",
+        },
+    },
+}
diff --git a/pkg/zlib/build.old.zig b/pkg/zlib/build.old.zig
new file mode 100644
index 000000000..fa2a57acb
--- /dev/null
+++ b/pkg/zlib/build.old.zig
@@ -0,0 +1,74 @@
+const std = @import("std");
+
+/// Directories with our includes.
+const root = thisDir() ++ "../../../vendor/zlib/";
+const include_path = root;
+
+pub const include_paths = .{include_path};
+
+pub const pkg = std.build.Pkg{
+    .name = "zlib",
+    .source = .{ .path = thisDir() ++ "/main.zig" },
+};
+
+fn thisDir() []const u8 {
+    return std.fs.path.dirname(@src().file) orelse ".";
+}
+
+pub fn link(b: *std.build.Builder, step: *std.build.LibExeObjStep) !*std.build.LibExeObjStep {
+    const lib = try buildLib(b, step);
+    step.linkLibrary(lib);
+    step.addIncludePath(.{ .path = include_path });
+    return lib;
+}
+
+pub fn buildLib(
+    b: *std.build.Builder,
+    step: *std.build.LibExeObjStep,
+) !*std.build.LibExeObjStep {
+    const lib = b.addStaticLibrary(.{
+        .name = "z",
+        .target = step.target,
+        .optimize = step.optimize,
+    });
+
+    // Include
+    lib.addIncludePath(.{ .path = include_path });
+
+    // Link
+    lib.linkLibC();
+
+    // Compile
+    var flags = std.ArrayList([]const u8).init(b.allocator);
+    defer flags.deinit();
+
+    try flags.appendSlice(&.{
+        "-DHAVE_SYS_TYPES_H",
+        "-DHAVE_STDINT_H",
+        "-DHAVE_STDDEF_H",
+        "-DZ_HAVE_UNISTD_H",
+    });
+
+    // C files
+    lib.addCSourceFiles(srcs, flags.items);
+
+    return lib;
+}
+
+const srcs = &.{
+    root ++ "adler32.c",
+    root ++ "compress.c",
+    root ++ "crc32.c",
+    root ++ "deflate.c",
+    root ++ "gzclose.c",
+    root ++ "gzlib.c",
+    root ++ "gzread.c",
+    root ++ "gzwrite.c",
+    root ++ "inflate.c",
+    root ++ "infback.c",
+    root ++ "inftrees.c",
+    root ++ "inffast.c",
+    root ++ "trees.c",
+    root ++ "uncompr.c",
+    root ++ "zutil.c",
+};
diff --git a/pkg/zlib/build.zig b/pkg/zlib/build.zig
index fa2a57acb..de00f4b73 100644
--- a/pkg/zlib/build.zig
+++ b/pkg/zlib/build.zig
@@ -1,74 +1,57 @@
 const std = @import("std");
 
-/// Directories with our includes.
-const root = thisDir() ++ "../../../vendor/zlib/";
-const include_path = root;
+pub fn build(b: *std.Build) !void {
+    const target = b.standardTargetOptions(.{});
+    const optimize = b.standardOptimizeOption(.{});
 
-pub const include_paths = .{include_path};
+    const upstream = b.dependency("zlib", .{});
 
-pub const pkg = std.build.Pkg{
-    .name = "zlib",
-    .source = .{ .path = thisDir() ++ "/main.zig" },
-};
-
-fn thisDir() []const u8 {
-    return std.fs.path.dirname(@src().file) orelse ".";
-}
-
-pub fn link(b: *std.build.Builder, step: *std.build.LibExeObjStep) !*std.build.LibExeObjStep {
-    const lib = try buildLib(b, step);
-    step.linkLibrary(lib);
-    step.addIncludePath(.{ .path = include_path });
-    return lib;
-}
-
-pub fn buildLib(
-    b: *std.build.Builder,
-    step: *std.build.LibExeObjStep,
-) !*std.build.LibExeObjStep {
     const lib = b.addStaticLibrary(.{
         .name = "z",
-        .target = step.target,
-        .optimize = step.optimize,
+        .target = target,
+        .optimize = optimize,
+    });
+    lib.linkLibC();
+    lib.addIncludePath(upstream.path(""));
+    lib.installHeadersDirectoryOptions(.{
+        .source_dir = upstream.path(""),
+        .install_dir = .header,
+        .install_subdir = "",
+        .include_extensions = &.{".h"},
     });
 
-    // Include
-    lib.addIncludePath(.{ .path = include_path });
-
-    // Link
-    lib.linkLibC();
-
-    // Compile
     var flags = std.ArrayList([]const u8).init(b.allocator);
     defer flags.deinit();
-
     try flags.appendSlice(&.{
         "-DHAVE_SYS_TYPES_H",
         "-DHAVE_STDINT_H",
         "-DHAVE_STDDEF_H",
         "-DZ_HAVE_UNISTD_H",
     });
+    for (srcs) |src| {
+        lib.addCSourceFile(.{
+            .file = upstream.path(src),
+            .flags = flags.items,
+        });
+    }
 
-    // C files
-    lib.addCSourceFiles(srcs, flags.items);
-
-    return lib;
+    b.installArtifact(lib);
 }
 
-const srcs = &.{
-    root ++ "adler32.c",
-    root ++ "compress.c",
-    root ++ "crc32.c",
-    root ++ "deflate.c",
-    root ++ "gzclose.c",
-    root ++ "gzlib.c",
-    root ++ "gzread.c",
-    root ++ "gzwrite.c",
-    root ++ "inflate.c",
-    root ++ "infback.c",
-    root ++ "inftrees.c",
-    root ++ "inffast.c",
-    root ++ "trees.c",
-    root ++ "uncompr.c",
-    root ++ "zutil.c",
+const srcs: []const []const u8 = &.{
+    "adler32.c",
+    "compress.c",
+    "crc32.c",
+    "deflate.c",
+    "gzclose.c",
+    "gzlib.c",
+    "gzread.c",
+    "gzwrite.c",
+    "inflate.c",
+    "infback.c",
+    "inftrees.c",
+    "inffast.c",
+    "trees.c",
+    "uncompr.c",
+    "zutil.c",
 };
diff --git a/pkg/zlib/build.zig.zon b/pkg/zlib/build.zig.zon
new file mode 100644
index 000000000..7550da4a3
--- /dev/null
+++ b/pkg/zlib/build.zig.zon
@@ -0,0 +1,10 @@
+.{
+    .name = "zlib",
+    .version = "1.3.0",
+    .dependencies = .{
+        .zlib = .{
+            .url = "https://github.com/madler/zlib/archive/refs/tags/v1.3.tar.gz",
+            .hash = "12207d353609d95cee9da7891919e6d9582e97b7aa2831bd50f33bf523a582a08547",
+        },
+    },
+}