diff --git a/build.zig.zon b/build.zig.zon
index f20291f..37e3ee0 100644
--- a/build.zig.zon
+++ b/build.zig.zon
@@ -2,7 +2,7 @@
     .name = .zpool,
     .fingerprint = 0xfb9579e9d9bd6e6c,
     .version = "0.11.0-dev",
-    .minimum_zig_version = "0.14.0",
+    .minimum_zig_version = "0.15.1",
     .paths = .{
         "build.zig",
         "build.zig.zon",
diff --git a/src/handle.zig b/src/handle.zig
index bb30b32..1ef3020 100644
--- a/src/handle.zig
+++ b/src/handle.zig
@@ -142,14 +142,7 @@ pub fn Handle(
             }
         };
 
-        pub fn format(
-            self: Self,
-            comptime fmt: []const u8,
-            options: std.fmt.FormatOptions,
-            writer: anytype,
-        ) !void {
-            _ = fmt;
-            _ = options;
+        pub fn format(self: Self, writer: *std.io.Writer) std.io.Writer.Error!void {
             const n = @typeName(Resource);
             const a = self.addressable();
             return writer.print("{s}[{}#{}]", .{ n, a.index, a.cycle });
@@ -273,6 +266,6 @@ test "Handle.format()" {
     const h = H.init(0, 1);
 
     var buffer = [_]u8{0} ** 128;
-    const s = try bufPrint(buffer[0..], "{}", .{h});
+    const s = try bufPrint(buffer[0..], "{f}", .{h});
     try expectEqualStrings("handle.test.Handle.format().Foo[0#1]", s);
 }