diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index b9d20d5..4bb880a 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -18,6 +18,6 @@ jobs:
         submodules: true
     - uses: goto-bus-stop/setup-zig@v2
       with:
-        version: 0.11.0
+        version: 0.13.0
     - name: Build
       run: zig build test
diff --git a/.gitignore b/.gitignore
index 3cef7be..1dfcbd2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1 @@
-zig-cache/
+.zig-cache/
diff --git a/README.md b/README.md
index 4715a74..5ab25e0 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 ![CI](https://github.com/ziglibs/zig-string-searching/workflows/CI/badge.svg)
 
 Implementation of some string-search algorithms in
-[zig](https://ziglang.org). Compatible with zig v0.11.0.
+[zig](https://ziglang.org). Compatible with zig 0.13.0.
 
 ### Boyer-Moore string searching
 
diff --git a/build.zig b/build.zig
index 51f4863..0e0a994 100644
--- a/build.zig
+++ b/build.zig
@@ -1,11 +1,11 @@
-const Builder = @import("std").build.Builder;
+const Build = @import("std").Build;
 
-pub fn build(b: *Builder) void {
+pub fn build(b: *Build) void {
     const target = b.standardTargetOptions(.{});
     const optimize = b.standardOptimizeOption(.{});
 
     const main_tests = b.addTest(.{
-        .root_source_file = .{ .path = "src/main.zig" },
+        .root_source_file = b.path("src/main.zig"),
         .target = target,
         .optimize = optimize,
     });
diff --git a/src/bitap.zig b/src/bitap.zig
index 80a8fa8..4e2ae70 100644
--- a/src/bitap.zig
+++ b/src/bitap.zig
@@ -14,7 +14,6 @@ pub fn bitap(
     text: T,
     pattern: T,
 ) ?usize {
-    assert(std.meta.trait.isIndexable(T));
     const ElemType = std.meta.Elem(T);
     assert(@typeInfo(ElemType) == .Int);
     assert(pattern.len <= max_pattern_length);
diff --git a/src/boyer_moore.zig b/src/boyer_moore.zig
index 9e4e6f2..a9b2876 100644
--- a/src/boyer_moore.zig
+++ b/src/boyer_moore.zig
@@ -7,7 +7,6 @@ const test_suites = @import("test_cases.zig").test_suites;
 const possibleValues = @import("common.zig").possibleValues;
 
 pub fn StringFinder(comptime T: type) type {
-    assert(std.meta.trait.isIndexable(T));
     const ElemType = std.meta.Elem(T);
     assert(@typeInfo(ElemType) == .Int);
 
diff --git a/src/rabin_karp.zig b/src/rabin_karp.zig
index e0fe400..d33eb65 100644
--- a/src/rabin_karp.zig
+++ b/src/rabin_karp.zig
@@ -7,12 +7,14 @@ const test_suites = @import("test_cases.zig").test_suites;
 pub fn byteRabinKarp(text: []const u8, pattern: []const u8) ?usize {
     const hashFn = struct {
         pub fn f(str: []const u8) usize {
+            // TODO
             return 0;
         }
     }.f;
 
     const continueHashFn = struct {
         pub fn f(h: usize, x: u8) usize {
+            // TODO
             return 0;
         }
     }.f;