diff --git a/README.md b/README.md
index 01f2f5e..3c776d3 100644
--- a/README.md
+++ b/README.md
@@ -87,6 +87,7 @@ that if you update one, you may need to also update the other.
 
 ### Version Changes
 
+* 2026-02-04 zig 0.16.0-dev.2471 - added process.Child.Cwd, see [#31090](https://codeberg.org/ziglang/zig/pulls/31090)
 * 2026-01-09 zig 0.16.0-dev.2075 - move randomness API to `std.Io`, see [#30709](https://codeberg.org/ziglang/zig/pulls/30709)
 * 2026-01-07 zig 0.16.0-dev.2040 - adjust temp files, see [#30683](https://codeberg.org/ziglang/zig/pulls/30683)
 * 2026-01-06 zig 0.16.0-dev.1976 - move process API to `std.Io` and changes to main/environ/argv, see [#30644](https://codeberg.org/ziglang/zig/pulls/30644)
diff --git a/build.zig b/build.zig
index be323c9..bb4d13e 100644
--- a/build.zig
+++ b/build.zig
@@ -15,7 +15,7 @@ const print = std.debug.print;
 //     1) Getting Started
 //     2) Version Changes
 comptime {
-    const required_zig = "0.16.0-dev.2075";
+    const required_zig = "0.16.0-dev.2471";
     const current_zig = builtin.zig_version;
     const min_zig = std.SemanticVersion.parse(required_zig) catch unreachable;
     if (current_zig.order(min_zig) == .lt) {
@@ -1287,7 +1287,7 @@ const exercises = [_]Exercise{
         \\Max difference (new fn): 0.014
         ,
     },
-    .{ .main_file = "110_quiz9.zig", .output = 
+    .{ .main_file = "110_quiz9.zig", .output =
     \\Toggle pins with XOR on PORTB
     \\-----------------------------
     \\  1100 // (initial state of PORTB)