diff --git a/build.zig b/build.zig
index dd448888d2c889bc246740fb0cfb08441e806bef..75918adaf86ae124344e486128d9b3e3b1a868b5 100644
--- a/build.zig
+++ b/build.zig
@@ -3,14 +3,16 @@ const deps = @import("./deps.zig");
 
 pub fn build(b: *std.Build) void {
     const target = b.standardTargetOptions(.{});
-    const mode = b.option(std.builtin.Mode, "mode", "") orelse .Debug;
+    const mode = b.option(std.builtin.OptimizeMode, "mode", "") orelse .Debug;
     const disable_llvm = b.option(bool, "disable_llvm", "use the non-llvm zig codegen") orelse false;
 
     const exe2 = b.addExecutable(.{
         .name = "generate",
-        .root_source_file = b.path("generate.zig"),
-        .target = target,
-        .optimize = mode,
+        .root_module = b.createModule(.{
+            .root_source_file = b.path("generate.zig"),
+            .target = target,
+            .optimize = mode,
+        }),
     });
     deps.addAllTo(exe2);
     exe2.use_llvm = !disable_llvm;
@@ -27,9 +29,11 @@ pub fn build(b: *std.Build) void {
     run_step2.dependOn(&run_cmd2.step);
 
     const tests = b.addTest(.{
-        .root_source_file = b.path("test.zig"),
-        .target = target,
-        .optimize = mode,
+        .root_module = b.createModule(.{
+            .root_source_file = b.path("test.zig"),
+            .target = target,
+            .optimize = mode,
+        }),
     });
     deps.addAllTo(tests);
     tests.use_llvm = !disable_llvm;
diff --git a/generate.zig b/generate.zig
index 0f693298a351e708ded4e74a933a94d5e8e2539f..5ff9337e9d5742f79bc72d0a3d1ecbf1f0eb0e50 100644
--- a/generate.zig
+++ b/generate.zig
@@ -2,13 +2,14 @@
 
 const std = @import("std");
 const json = @import("json");
+const nfs = @import("nfs");
 
 pub fn main() !void {
     var gpa = std.heap.GeneralPurposeAllocator(.{}){};
     const alloc = gpa.allocator();
 
-    const f = try std.fs.cwd().createFile("src/lib.zig", .{});
-    const w = f.writer();
+    const f = try nfs.cwd().createFile("src/lib.zig", .{});
+    const w = f;
 
     {
         std.log.info("spdx", .{});
@@ -73,16 +74,16 @@ pub fn simple_fetch(alloc: std.mem.Allocator, url: []const u8) !json.Document {
     var client = std.http.Client{ .allocator = alloc };
     defer client.deinit();
 
-    var list = std.ArrayList(u8).init(alloc);
+    var list = std.Io.Writer.Allocating.init(alloc);
     defer list.deinit();
 
     const fetch = try client.fetch(.{
         .location = .{ .url = url },
-        .response_storage = .{ .dynamic = &list },
+        .response_writer = &list.writer,
     });
     const opts = json.Parser.Options{ .maximum_depth = 100, .support_trailing_commas = true };
     if (fetch.status != .ok) return try json.parseFromSlice(alloc, url, "{}", opts);
-    return try json.parseFromSlice(alloc, url, list.items, opts);
+    return try json.parseFromSlice(alloc, url, list.written(), opts);
 }
 
 fn spdxlicenseLessThan(context: void, lhs: json.ValueIndex, rhs: json.ValueIndex) bool {
diff --git a/zig.mod b/zig.mod
index 6ad3da4f0a97a6fe5e10b88c5699dd011a9058d8..4e02a1180809376b908c5fb82171f4c6ade020fb 100644
--- a/zig.mod
+++ b/zig.mod
@@ -4,3 +4,4 @@ main: src/lib.zig
 license: MIT
 root_dependencies:
   - src: git https://github.com/nektro/zig-json
+  - src: git https://github.com/nektro/zig-nfs