diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 84280cd..5e9b7da 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,6 +15,6 @@ jobs:
   check:
     uses: fizzyedit/plugin-build-action/.github/workflows/check.yml@v7
     with:
-      zig-version: "0.16.0"
+      zig-version: "0.17.0"
     # secrets:
     #   build_env: ${{ secrets.MY_BUILD_ENV }}   # as in release.yml, if the build needs one
diff --git a/build.zig.zon b/build.zig.zon
index 60b50a5..4c2f626 100644
--- a/build.zig.zon
+++ b/build.zig.zon
@@ -1,15 +1,15 @@
 .{
     .name = .chat,
     .version = "0.1.0",
-    .minimum_zig_version = "0.16.0",
+    .minimum_zig_version = "0.17.0",
     .paths = .{ "build.zig", "build.zig.zon", "plugin.zig", "plugin.zig.zon", "src", "README.md" },
     .fingerprint = 0x659df2aa189488bc,
     .dependencies = .{
         .fizzy = .{
             // The published SDK, not a path into a checkout: a release has to build from a
             // clean clone. To build against a local fizzy: `zig build --fork=<fizzy>/sdk`.
-            .url = "https://github.com/fizzyedit/fizzy/releases/download/sdk-v0.2.26/fizzy-sdk-v0.2.26.tar.gz",
-            .hash = "fizzy-0.2.26-SGBwY8PFJADYTlbtNoDPd21a3l4Kwv0EF6Zcp--jzU81",
+            .url = "https://github.com/fizzyedit/fizzy/releases/download/sdk-v0.2.30/fizzy-sdk-v0.2.30.tar.gz",
+            .hash = "fizzy-0.2.30-SGBwY1QnJwDznUMVnSLATxXgH2e8_Vz7eMwLj9UQ0sVU",
         },
     },
 }
diff --git a/plugin.zig.zon b/plugin.zig.zon
index 225fe42..91bf5d6 100644
--- a/plugin.zig.zon
+++ b/plugin.zig.zon
@@ -1,7 +1,7 @@
 .{
     .id = "chat",
     .name = "Chat",
-    .version = "0.1.0",
-    .min_sdk_version = "0.2.26",
+    .version = "0.1.1",
+    .min_sdk_version = "0.2.30",
     .description = "Talk to any AI agent that speaks the Agent Client Protocol (Claude, Codex, Gemini, Copilot, …) in a fizzy panel, and watch it work in fizzy through the agent plugin's tools.",
 }
diff --git a/src/AcpClient.zig b/src/AcpClient.zig
index bfdbe24..cd9d78a 100644
--- a/src/AcpClient.zig
+++ b/src/AcpClient.zig
@@ -507,7 +507,7 @@ fn findMcp(arena: std.mem.Allocator) ?[]const u8 {
     const host = sdk.host();
     const dir = host.pluginInstallDir("agent") orelse return null;
     defer host.allocator.free(dir);
-    const name = if (@import("builtin").os.tag == .windows) "fizzy-mcp.exe" else "fizzy-mcp";
+    const name = if (@import("builtin").target.os.tag == .windows) "fizzy-mcp.exe" else "fizzy-mcp";
     const path = std.fs.path.join(arena, &.{ dir, name }) catch return null;
     std.Io.Dir.accessAbsolute(dvui.io, path, .{ .execute = true }) catch return null;
     return path;
diff --git a/src/Agent.zig b/src/Agent.zig
index 1e5ebf0..8a48a63 100644
--- a/src/Agent.zig
+++ b/src/Agent.zig
@@ -54,7 +54,7 @@ pub fn start(gpa: std.mem.Allocator, io: Io, argv: []const []const u8, cwd: []co
 }
 
 fn spawn(gpa: std.mem.Allocator, io: Io, argv: []const []const u8, cwd: []const u8) !std.process.Child {
-    if (comptime builtin.os.tag == .macos) {
+    if (comptime builtin.target.os.tag == .macos) {
         return core.darwin_spawn.spawn(gpa, .{
             .argv = argv,
             .cwd = cwd,
@@ -172,7 +172,7 @@ fn readStderr(self: *Agent) void {
 /// `name` on this process's PATH, then the login shell's; null for a path or when not found
 /// (the spawn then fails with the name as given). As `core/lsp/Client.zig`'s `resolveExecutable`.
 fn resolveExecutable(gpa: std.mem.Allocator, io: Io, name: []const u8) ?[]u8 {
-    if (comptime builtin.os.tag == .windows) return null;
+    if (comptime builtin.target.os.tag == .windows) return null;
     if (std.mem.indexOfScalar(u8, name, '/') != null) return null;
     const inherited: ?[]const u8 = if (std.c.getenv("PATH")) |p| std.mem.span(p) else null;
     if (findInPath(gpa, io, inherited, name)) |found| return found;
diff --git a/src/Transcript.zig b/src/Transcript.zig
index 2cd3f78..b5fcb6e 100644
--- a/src/Transcript.zig
+++ b/src/Transcript.zig
@@ -465,12 +465,13 @@ pub fn load(self: *Transcript, bytes: []const u8, images_dir: []const u8, io: st
     var arena_state: std.heap.ArenaAllocator = .init(self.gpa);
     defer arena_state.deinit();
     const arena = arena_state.allocator();
-    const source = try arena.dupeZ(u8, bytes);
+    const source = try arena.dupeSentinel(u8, bytes, 0);
     const Probe = struct { version: u32 = 1 };
-    const probe = std.zon.parse.fromSliceAlloc(Probe, arena, source, null, .{ .ignore_unknown_fields = true }) catch Probe{};
+    var diag: std.zon.parse.Diagnostics = undefined;
+    const probe = std.zon.parse.fromSlice(Probe, .{ .gpa = arena, .arena = arena, .source = source, .diagnostics = &diag, .ignore_unknown_fields = true }) catch Probe{};
     if (probe.version < format_version) return self.loadV1(arena, source);
 
-    const saved = try std.zon.parse.fromSliceAlloc(Saved, arena, source, null, .{ .ignore_unknown_fields = true });
+    const saved = try std.zon.parse.fromSlice(Saved, .{ .gpa = arena, .arena = arena, .source = source, .diagnostics = &diag, .ignore_unknown_fields = true });
     for (saved.messages) |m| {
         try self.messages.append(self.gpa, .{ .author = m.author });
         const msg = &self.messages.items[self.messages.items.len - 1];
@@ -556,7 +557,8 @@ fn loadV1(self: *Transcript, arena: std.mem.Allocator, source: [:0]const u8) !Lo
         title: []const u8 = "",
         entries: []const struct { kind: Kind, text: []const u8, status: Status = .pending, detail: []const u8 = "" } = &.{},
     };
-    const old = try std.zon.parse.fromSliceAlloc(V1, arena, source, null, .{ .ignore_unknown_fields = true });
+    var diag: std.zon.parse.Diagnostics = undefined;
+    const old = try std.zon.parse.fromSlice(V1, .{ .gpa = arena, .arena = arena, .source = source, .diagnostics = &diag, .ignore_unknown_fields = true });
     var current: ?chat.MessageId = null;
     for (old.entries) |e| switch (e.kind) {
         .user => current = try self.post(.person, &.{.{ .text = e.text }}),
diff --git a/src/api.zig b/src/api.zig
index bb8bef2..236ef02 100644
--- a/src/api.zig
+++ b/src/api.zig
@@ -182,8 +182,9 @@ pub const NewChat = struct { folder: []const u8 = "" };
 
 /// Parse a command's arguments, in `arena`.
 pub fn parse(comptime T: type, arena: std.mem.Allocator, zon: []const u8) !T {
-    const src = try arena.dupeZ(u8, std.mem.trim(u8, zon, " \t\r\n"));
-    return std.zon.parse.fromSliceAlloc(T, arena, src, null, .{ .ignore_unknown_fields = true });
+    const src = try arena.dupeSentinel(u8, std.mem.trim(u8, zon, " \t\r\n"), 0);
+    var diag: std.zon.parse.Diagnostics = undefined;
+    return std.zon.parse.fromSlice(T, .{ .gpa = arena, .arena = arena, .source = src, .diagnostics = &diag, .ignore_unknown_fields = true });
 }
 
 /// Write a command's arguments.