diff --git a/.gitignore b/.gitignore
index 9bb4e1d..c1eaadb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,4 +3,5 @@ dist
 .env
 repos
 .zig-cache
+zig-pkg
 zig-out
diff --git a/README.md b/README.md
index b4e6172..a5779c5 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ You can either:
 - Use it online: https://playground.zigtools.org/
 - Run it locally:
 
-Requires Zig `0.15.2`. Will automatically fetch Zig along with ZLS, compiling both for webassembly.
+Requires Zig `0.16.0`. Will automatically fetch Zig along with ZLS, compiling both for webassembly.
 
 ```bash
 zig build -Drelease
diff --git a/build.zig b/build.zig
index 7adfe6c..b29dfde 100644
--- a/build.zig
+++ b/build.zig
@@ -8,16 +8,18 @@ pub fn build(b: *std.Build) void {
 
     const zls_step = b.step("zls", "compile and install ZLS");
     const zig_step = b.step("zig", "compile and install Zig");
+    const compiler_rt_step = b.step("zig_compiler_rt", "compile and install compiler_rt");
     const tarball_step = b.step("zig_tarball", "compile and install zig.tar.gz");
 
     b.getInstallStep().dependOn(zls_step);
     b.getInstallStep().dependOn(zig_step);
+    b.getInstallStep().dependOn(compiler_rt_step);
     b.getInstallStep().dependOn(tarball_step);
 
     const zls_dependency = b.dependency("zls", .{
         .target = target,
         .optimize = optimize,
-        // .@"version-string" = @as([]const u8, "0.16.0-dev"),
+        // .@"version-string" = @as([]const u8, "0.17.0-dev"),
     });
 
     const zls_exe = b.addExecutable(.{
@@ -38,12 +40,23 @@ pub fn build(b: *std.Build) void {
     const zig_dependency = b.dependency("zig", .{
         .target = target,
         .optimize = optimize,
-        .@"version-string" = @as([]const u8, "0.15.1"),
+        .@"version-string" = @as([]const u8, "0.17.0"),
         .@"no-lib" = true,
         .dev = "wasm",
     });
     zig_step.dependOn(installArtifact(b, zig_dependency.artifact("zig"), enable_wasm_opt));
 
+    const lib_compiler_rt = b.addLibrary(.{
+        .linkage = .static,
+        .name = "compiler_rt",
+        .root_module = b.createModule(.{
+            .root_source_file = zig_dependency.path("lib/compiler_rt.zig"),
+            .target = target,
+            .optimize = optimize,
+        }),
+    });
+    compiler_rt_step.dependOn(&b.addInstallArtifact(lib_compiler_rt, .{ .dest_dir = .{ .override = .prefix } }).step);
+
     const run_tar = b.addSystemCommand(&.{ "tar", "-czf" });
     const zig_tar_gz = run_tar.addOutputFileArg("zig.tar.gz");
     tarball_step.dependOn(&b.addInstallFile(zig_tar_gz, "zig.tar.gz").step);
diff --git a/build.zig.zon b/build.zig.zon
index 59181e0..1d611db 100644
--- a/build.zig.zon
+++ b/build.zig.zon
@@ -2,15 +2,15 @@
     .name = .playground,
     .version = "0.0.0",
     .fingerprint = 0xdc188848360fd988, // Changing this has security and trust implications.
-    .minimum_zig_version = "0.15.2",
+    .minimum_zig_version = "0.16.0",
     .dependencies = .{
         .zls = .{
-            .url = "git+https://github.com/zigtools/zls?ref=0.15.1#f91b2e1e305e5d5bd3725aea90f9f9bfb3dce055",
-            .hash = "zls-0.15.1-rmm5fgQ2JADjDh84Ja3pDBZ1io_kKdHS2YhQyvBYz66r",
+            .url = "git+https://github.com/zigtools/zls?ref=0.16.0#494486203c3a48927f2383aa3d5ce5fca112186d",
+            .hash = "zls-0.16.0-rmm5fs_JJgBG3dk5HwYK1FylE2_LMN0BYpX57tPzT-Xc",
         },
         .zig = .{
-            .url = "git+https://github.com/zigtools/zig?ref=wasm32-wasi#e123e17142e0576498ba7f14971e24565c242bd4",
-            .hash = "zig-0.0.0-Fp4XJMPnIg0zUDsFeLUD3kzBiBYbT_YSvJZo0pVB3tnR",
+            .url = "git+https://github.com/zigtools/zig?ref=wasm32-wasi#1c430bc130989d285723de8b7aa8e3c77297a266",
+            .hash = "zig-0.0.0-Fp4XJHzK5Q2xL7r676PlbSvBhz_af_mGXkGPVaXvf_Kx",
         },
     },
     .paths = .{""},
diff --git a/src/main.zig b/src/main.zig
index 3b2b910..27cedd4 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -1,5 +1,5 @@
 const std = @import("std");
 
-pub fn main() !void {
-    try std.fs.File.stdout().writeAll("Hello, World!\n");
+pub fn main(init: std.process.Init) !void {
+    try std.Io.File.stdout().writeStreamingAll(init.io, "Hello, World!\n");
 }
diff --git a/src/workers/zig.ts b/src/workers/zig.ts
index 58efb0f..b95f20d 100644
--- a/src/workers/zig.ts
+++ b/src/workers/zig.ts
@@ -8,18 +8,15 @@ async function run(source: string) {
     currentlyRunning = true;
 
     const libDirectory = await getLatestZigArchive();
+    const libCompilerRt = await fetch(new URL("../../zig-out/libcompiler_rt.a", import.meta.url));
 
-    // -fno-llvm -fno-lld is set explicitly to ensure the native WASM backend is
-    // used in preference to LLVM. This may be removable once the non-LLVM
-    // backends become more mature.
     let args = [
         "zig.wasm",
         "build-exe",
         "main.zig",
-        "-fno-llvm",
-        "-fno-lld",
-        "-fno-ubsan-rt",
-        "-fno-entry", // prevent the native webassembly backend from adding a start function to the module 
+        "libcompiler_rt.a",
+        "-fno-compiler-rt", // manually linked because the self hosted webassembly backend cannot compile it by itself
+        "-fno-entry", // prevent the native webassembly backend from adding a start function to the module
     ];
     let env = [];
     let fds = [
@@ -28,6 +25,7 @@ async function run(source: string) {
         stderrOutput(), // stderr
         new PreopenDirectory(".", new Map<string, Inode>([
             ["main.zig", new File(new TextEncoder().encode(source))],
+            ["libcompiler_rt.a", new File(await libCompilerRt.arrayBuffer())]
         ])),
         new PreopenDirectory("/lib", libDirectory.contents),
         new PreopenDirectory("/cache", new Map()),
diff --git a/src/zls.zig b/src/zls.zig
index d5771a1..8eb5386 100644
--- a/src/zls.zig
+++ b/src/zls.zig
@@ -12,7 +12,7 @@ pub const std_options: std.Options = .{
 
 fn logFn(
     comptime level: std.log.Level,
-    comptime scope: @Type(.enum_literal),
+    comptime scope: @EnumLiteral(),
     comptime format: []const u8,
     args: anytype,
 ) void {
@@ -20,14 +20,14 @@ fn logFn(
     var buffer: [4096]u8 = undefined;
     comptime std.debug.assert(buffer.len >= zls.lsp.minimum_logging_buffer_size);
 
-    const lsp_message_type: zls.lsp.types.MessageType = switch (level) {
+    const lsp_message_type: zls.lsp.types.window.MessageType = switch (level) {
         .err => .Error,
         .warn => .Warning,
         .info => .Info,
         .debug => .Debug,
     };
     const json_message = zls.lsp.bufPrintLogMessage(&buffer, lsp_message_type, format, args);
-    transport.writeJsonMessage(json_message) catch {};
+    transport.writeJsonMessage(threaded.io(), json_message) catch {};
 }
 
 var transport: zls.lsp.Transport = .{
@@ -37,15 +37,18 @@ var transport: zls.lsp.Transport = .{
     },
 };
 
-fn readJsonMessage(_: *zls.lsp.Transport, _: std.mem.Allocator) (std.mem.Allocator.Error || zls.lsp.Transport.ReadError)![]u8 {
+fn readJsonMessage(_: *zls.lsp.Transport, _: std.Io, _: std.mem.Allocator) (std.mem.Allocator.Error || zls.lsp.Transport.ReadError)![]u8 {
     unreachable;
 }
 
-fn writeJsonMessage(_: *zls.lsp.Transport, json_message: []const u8) zls.lsp.Transport.WriteError!void {
+fn writeJsonMessage(_: *zls.lsp.Transport, _: std.Io, json_message: []const u8) zls.lsp.Transport.WriteError!void {
     output_message_starts.append(allocator, output_message_bytes.items.len) catch return error.NoSpaceLeft;
     output_message_bytes.appendSlice(allocator, json_message) catch return error.NoSpaceLeft;
 }
 
+var threaded: std.Io.Threaded = .init_single_threaded;
+var environ_map: std.process.Environ.Map = undefined;
+var config_manager: zls.configuration.Manager = undefined;
 var server: *zls.Server = undefined;
 
 var input_bytes: std.ArrayList(u8) = .empty;
@@ -54,12 +57,15 @@ var output_message_starts: std.ArrayList(usize) = .empty;
 var output_message_bytes: std.ArrayList(u8) = .empty;
 
 export fn createServer() void {
+    const io = threaded.io();
+    environ_map = .init(allocator);
+    config_manager = zls.configuration.Manager.init(io, allocator, &environ_map) catch @panic("server creation failed");
     server = zls.Server.create(.{
+        .io = io,
         .allocator = allocator,
-        .transport = null,
-        .config = null,
+        .transport = &transport,
+        .config_manager = &config_manager,
     }) catch @panic("server creation failed");
-    server.setTransport(&transport);
 }
 
 export fn allocMessage(len: usize) [*]const u8 {