diff --git a/README.md b/README.md
index d393399..d355411 100644
--- a/README.md
+++ b/README.md
@@ -41,7 +41,7 @@ Verify the installation and build number of `zig` like so:
 
 ```bash
 $ zig version
-0.11.0-dev.1602+xxxxxxxxx
+0.11.0-dev.1638+xxxxxxxxx
 ```
 
 Clone this repository with Git:
@@ -81,8 +81,8 @@ about input:
 
 ### Version Changes
 
-Version-0.11.0-dev.1602+xxxxxxxxx
-* *2023-02-12* zig 0.11.0-dev.1602 - 
+Version-0.11.0-dev.1638+xxxxxxxxx
+* *2023-02-12* zig 0.11.0-dev.1638 - changes in `std.Build` cache_root now returns a directory struct
 * *2023-02-04* zig 0.11.0-dev.1568 - changes in `std.Build` (combine `std.build` and `std.build.Builder` into `std.Build`)
 * *2023-01-14* zig 0.11.0-dev.1302 - changes in `@addWithOverflow` (now returns a tuple) and `@typeInfo`; temporary disabled async functionality
 * *2022-09-09* zig 0.10.0-dev.3978 - change in `NativeTargetInfo.detect` in build
diff --git a/build.zig b/build.zig
index 6d9a94d..930fc56 100644
--- a/build.zig
+++ b/build.zig
@@ -8,7 +8,7 @@ const print = std.debug.print;
 // When changing this version, be sure to also update README.md in two places:
 //     1) Getting Started
 //     2) Version Changes
-const needed_version = std.SemanticVersion.parse("0.11.0-dev.1602") catch unreachable;
+const needed_version = std.SemanticVersion.parse("0.11.0-dev.1638") catch unreachable;
 
 const Exercise = struct {
     /// main_file must have the format key_name.zig.
@@ -639,7 +639,7 @@ const ZiglingStep = struct {
 
         print("Checking {s}...\n", .{self.exercise.main_file});
 
-        const cwd = self.builder.build_root;
+        const cwd = self.builder.build_root.path.?;
 
         const argv = [_][]const u8{exe_file};
 
@@ -734,7 +734,7 @@ const ZiglingStep = struct {
         zig_args.append(builder.pathFromRoot(zig_file)) catch unreachable;
 
         zig_args.append("--cache-dir") catch unreachable;
-        zig_args.append(builder.pathFromRoot(builder.cache_root)) catch unreachable;
+        zig_args.append(builder.pathFromRoot(builder.cache_root.path.?)) catch unreachable;
 
         zig_args.append("--enable-cache") catch unreachable;