diff --git a/libs/sysjs/build.zig b/libs/sysjs/build.zig
index eb5bcd60..7f2ec8b8 100644
--- a/libs/sysjs/build.zig
+++ b/libs/sysjs/build.zig
@@ -1,24 +1,28 @@
 const std = @import("std");
 
-pub fn build(b: *std.build.Builder) void {
-    const mode = b.standardReleaseOptions();
+pub fn build(b: *std.Build) void {
+    const optimize = b.standardOptimizeOption(.{});
     const target = b.standardTargetOptions(.{});
     const test_step = b.step("test", "Run library tests");
-    test_step.dependOn(&testStep(b, mode, target).step);
+    test_step.dependOn(&testStep(b, optimize, target).step);
 }
 
-pub fn testStep(b: *std.build.Builder, mode: std.builtin.Mode, target: std.zig.CrossTarget) *std.build.RunStep {
-    const main_tests = b.addTestExe("sysjs-tests", sdkPath("/src/main.zig"));
-    main_tests.setBuildMode(mode);
-    main_tests.setTarget(target);
+pub fn testStep(b: *std.Build, optimize: std.builtin.OptimizeMode, target: std.zig.CrossTarget) *std.build.RunStep {
+    const main_tests = b.addTest(.{
+        .name = "sysjs-tests",
+        .kind = .test_exe,
+        .root_source_file = .{ .path = sdkPath("/src/main.zig") },
+        .target = target,
+        .optimize = optimize,
+    });
     return main_tests.run();
 }
 
-pub const pkg = std.build.Pkg{
-    .name = "sysjs",
-    .source = .{ .path = sdkPath("/src/main.zig") },
-    .dependencies = &[_]std.build.Pkg{},
-};
+pub fn module(b: *std.Build) *std.build.Module {
+    return b.createModule(.{
+        .source_file = .{ .path = sdkPath("/src/main.zig") },
+    });
+}
 
 fn sdkPath(comptime suffix: []const u8) []const u8 {
     if (suffix[0] != '/') @compileError("suffix must be an absolute path");