diff --git a/.github/workflows/zig-build.yaml b/.github/workflows/zig-build.yaml
index f3876b3..3ead6ab 100644
--- a/.github/workflows/zig-build.yaml
+++ b/.github/workflows/zig-build.yaml
@@ -12,7 +12,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: elerch/setup-zig@v3
         with:
-          version: 0.12.0
+          version: 0.13.0
       - uses: elerch/zig-action-cache@v1.1.6
       - name: Build project
         run: zig build --summary all
diff --git a/build.zig b/build.zig
index acd98ec..4aba367 100644
--- a/build.zig
+++ b/build.zig
@@ -19,7 +19,7 @@ pub fn build(b: *std.Build) !void {
         .name = "lambda-zig",
         // In this case the main source file is merely a path, however, in more
         // complicated build scripts, this could be a generated file.
-        .root_source_file = .{ .path = "src/lambda.zig" },
+        .root_source_file = b.path("src/lambda.zig"),
         .target = target,
         .optimize = optimize,
     });
@@ -38,7 +38,7 @@ pub fn build(b: *std.Build) !void {
     // Creates a step for unit testing. This only builds the test executable
     // but does not run it.
     const main_tests = b.addTest(.{
-        .root_source_file = .{ .path = "src/lambda.zig" },
+        .root_source_file = b.path("src/lambda.zig"),
         .target = target,
         .optimize = optimize,
     });
@@ -53,7 +53,7 @@ pub fn build(b: *std.Build) !void {
 
     const exe = b.addExecutable(.{
         .name = "custom",
-        .root_source_file = .{ .path = "src/sample-main.zig" },
+        .root_source_file = b.path("src/sample-main.zig"),
         .target = target,
         .optimize = optimize,
     });