diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index f8d28d6..352207a 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -16,7 +16,7 @@ jobs:
       - name: Setup Zig
         uses: mlugg/setup-zig@v2
         with:
-          version: 0.15.1
+          version: 0.16.0
 
       - name: Build
         run: |
diff --git a/.gitignore b/.gitignore
index 3389c86..7e28a89 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 .zig-cache/
 zig-out/
+zig-pkg/
\ No newline at end of file
diff --git a/build.zig.zon b/build.zig.zon
index 9b78c87..0d4a962 100644
--- a/build.zig.zon
+++ b/build.zig.zon
@@ -2,15 +2,15 @@
     .name = .hyperdoc,
     .version = "0.1.0",
     .fingerprint = 0xfd1a4802abc4739e,
-
+    .minimum_zig_version = "0.16.0",
     .dependencies = .{
         .parser_toolkit = .{
             .url = "git+https://github.com/ikskuh/parser-toolkit.git#62e0a3dca3632bb361df59407b2d7805280ab1b9",
             .hash = "parser_toolkit-0.1.0-baYGPUVCEwBaVmu09ORh0lLlVjRaJ489TdSIdTa_8VWg",
         },
         .args = .{
-            .url = "git+https://github.com/ikskuh/zig-args.git#8ae26b44a884ff20dca98ee84c098e8f8e94902f",
-            .hash = "args-0.0.0-CiLiqojRAACGzDRO7A9dw7kWSchNk29caJZkXuMCb0Cn",
+            .url = "git+https://github.com/ikskuh/zig-args.git#d47ae21768f9ec47c2a4154ab48b87166965b820",
+            .hash = "args-0.0.0-CiLiqmvgAADyJmrzcQTP9IOYNvTzR_KGrg3ZNNsH2Qv0",
         },
     },
 
diff --git a/src/main.zig b/src/main.zig
index 462bfe7..e98aa21 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -2,22 +2,19 @@ const std = @import("std");
 const hdoc = @import("hyperdoc");
 const args_parser = @import("args");
 
-pub fn main() !u8 {
+pub fn main(init: std.process.Init) !u8 {
     var stdout_buf: [1024]u8 = undefined;
-    const stdout_file: std.fs.File = .stdout();
-    var stdout_writer = stdout_file.writer(&stdout_buf);
+    const stdout_file: std.Io.File = .stdout();
+    var stdout_writer = stdout_file.writer(init.io, &stdout_buf);
     const stdout = &stdout_writer.interface;
     var stderr_buf: [1024]u8 = undefined;
-    const stderr_file: std.fs.File = .stderr();
-    var stderr_writer = stderr_file.writer(&stderr_buf);
+    const stderr_file: std.Io.File = .stderr();
+    var stderr_writer = stderr_file.writer(init.io, &stderr_buf);
     const stderr = &stderr_writer.interface;
 
-    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
-    defer _ = gpa.deinit();
+    const allocator = init.gpa;
 
-    const allocator = gpa.allocator();
-
-    var cli = args_parser.parseForCurrentProcess(CliOptions, allocator, .print) catch return 1;
+    var cli = args_parser.parseForCurrentProcess(CliOptions, init, .print) catch return 1;
     defer cli.deinit();
 
     if (cli.options.help) {
@@ -33,10 +30,11 @@ pub fn main() !u8 {
     var error_location: hdoc.ErrorLocation = undefined;
 
     var document: hdoc.Document = blk: {
-        const source_text = try std.fs.cwd().readFileAlloc(
-            allocator,
+        const source_text = try std.Io.Dir.cwd().readFileAlloc(
+            init.io,
             cli.positionals[0],
-            512 << 20,
+            allocator,
+            .limited(512 << 20),
         ); // 512MB
         defer allocator.free(source_text);
 
@@ -64,11 +62,11 @@ pub fn main() !u8 {
     };
     defer document.deinit();
 
-    const output_file: ?std.fs.File = if (cli.options.output != null and !std.mem.eql(u8, cli.options.output.?, "-"))
-        try std.fs.cwd().createFile(cli.options.output.?, .{})
+    const output_file: ?std.Io.File = if (cli.options.output != null and !std.mem.eql(u8, cli.options.output.?, "-"))
+        try std.Io.Dir.cwd().createFile(init.io, cli.options.output.?, .{})
     else
         null;
-    defer if (output_file) |f| f.close();
+    defer if (output_file) |f| f.close(init.io);
 
     const renderDocument = switch (cli.options.format) {
         .hdoc => &@import("renderer/HyperDoc.zig").render,
@@ -78,7 +76,7 @@ pub fn main() !u8 {
 
     if (output_file) |f| {
         var out_buf: [1024]u8 = undefined;
-        var out_writer = f.writer(&out_buf);
+        var out_writer = f.writer(init.io, &out_buf);
         const output_stream = &out_writer.interface;
         try renderDocument(output_stream, document);
         try output_stream.flush();