diff --git a/build.zig b/build.zig
index 8ebedc5b5e124d965f1d0ae889ecdde579ac529a..9508d36be6132ca658a40810481368c087034cdd 100644
--- a/build.zig
+++ b/build.zig
@@ -308,7 +308,7 @@ pub fn build(b: *std.Build) !void {
             },
         }
     };
-    const version = try b.allocator.dupeZ(u8, version_slice);
+    const version = try b.allocator.dupeSentinel(u8, version_slice, 0);
     exe_options.addOption([:0]const u8, "version", version);
 
     if (enable_llvm) {
diff --git a/lib/compiler/aro/aro/CodeGen.zig b/lib/compiler/aro/aro/CodeGen.zig
index 74dc454ffb623835659db25989848c29aafc2808..fdbcb9909e0d17fb3c08ded8ff4283a754d096f2 100644
--- a/lib/compiler/aro/aro/CodeGen.zig
+++ b/lib/compiler/aro/aro/CodeGen.zig
@@ -894,7 +894,7 @@ fn genLval(c: *CodeGen, node_index: Node.Index) Error!Ir.Ref {
                 }
             }
 
-            const duped_name = try c.builder.arena.allocator().dupeZ(u8, slice);
+            const duped_name = try c.builder.arena.allocator().dupeSentinel(u8, slice, 0);
             const ref: Ir.Ref = @enumFromInt(c.builder.instructions.len);
             try c.builder.instructions.append(c.builder.gpa, .{ .tag = .symbol, .data = .{ .label = duped_name }, .ty = .ptr });
             return ref;
@@ -1112,7 +1112,7 @@ fn genCall(c: *CodeGen, call: Node.Call) Error!Ir.Ref {
                     }
                 }
 
-                const duped_name = try c.builder.arena.allocator().dupeZ(u8, slice);
+                const duped_name = try c.builder.arena.allocator().dupeSentinel(u8, slice, 0);
                 const ref: Ir.Ref = @enumFromInt(c.builder.instructions.len);
                 try c.builder.instructions.append(c.builder.gpa, .{ .tag = .symbol, .data = .{ .label = duped_name }, .ty = .ptr });
                 break :blk ref;
diff --git a/lib/std/Build/Watch/FsEvents.zig b/lib/std/Build/Watch/FsEvents.zig
index dd22a5881df3cc888d9cc44a9e9f546f42ce3169..0a56ce182255176222ef4b9a7a7bbb22abc9350d 100644
--- a/lib/std/Build/Watch/FsEvents.zig
+++ b/lib/std/Build/Watch/FsEvents.zig
@@ -195,7 +195,7 @@ pub fn setPaths(fse: *FsEvents, gpa: Allocator, steps: []const *std.Build.Step)
     } else {
         fse.watch_roots = try gpa.realloc(fse.watch_roots, need_dirs.count());
         for (fse.watch_roots, need_dirs.keys()) |*out, in| {
-            out.* = try paths_arena.dupeZ(u8, in);
+            out.* = try paths_arena.dupeSentinel(u8, in, 0);
         }
     }
     if (enable_debug_logs) {
diff --git a/lib/std/Io/Dir.zig b/lib/std/Io/Dir.zig
index 95388eac789f9a16d523bd28e10a16aaa591c18c..15785cfd8a69a04cf7682110dc84754424a7b306 100644
--- a/lib/std/Io/Dir.zig
+++ b/lib/std/Io/Dir.zig
@@ -944,7 +944,7 @@ pub const RealPathFileAllocError = RealPathFileError || Allocator.Error;
 pub fn realPathFileAlloc(dir: Dir, io: Io, sub_path: []const u8, allocator: Allocator) RealPathFileAllocError![:0]u8 {
     var buffer: [max_path_bytes]u8 = undefined;
     const n = try realPathFile(dir, io, sub_path, &buffer);
-    return allocator.dupeZ(u8, buffer[0..n]);
+    return allocator.dupeSentinel(u8, buffer[0..n], 0);
 }
 
 /// Same as `realPathFile` except `absolute_path` is asserted to be an absolute
@@ -974,7 +974,7 @@ pub fn realPathFileAbsolute(io: Io, absolute_path: []const u8, out_buffer: []u8)
 pub fn realPathFileAbsoluteAlloc(io: Io, absolute_path: []const u8, allocator: Allocator) RealPathFileAllocError![:0]u8 {
     var buffer: [max_path_bytes]u8 = undefined;
     const n = try realPathFileAbsolute(io, absolute_path, &buffer);
-    return allocator.dupeZ(u8, buffer[0..n]);
+    return allocator.dupeSentinel(u8, buffer[0..n], 0);
 }
 
 pub const DeleteFileError = error{
diff --git a/lib/std/Io/Dispatch.zig b/lib/std/Io/Dispatch.zig
index 93a1bd93db28ffff82b100979c983168d3b9e8b1..c672421e3350aebbc955c97bb1693213e2b64744 100644
--- a/lib/std/Io/Dispatch.zig
+++ b/lib/std/Io/Dispatch.zig
@@ -4086,7 +4086,7 @@ fn processReplace(userdata: ?*anyopaque, options: process.ReplaceOptions) proces
     const arena = arena_allocator.allocator();
 
     const argv_buf = try arena.allocSentinel(?[*:0]const u8, options.argv.len, null);
-    for (options.argv, 0..) |arg, i| argv_buf[i] = (try arena.dupeZ(u8, arg)).ptr;
+    for (options.argv, 0..) |arg, i| argv_buf[i] = (try arena.dupeSentinel(u8, arg, 0)).ptr;
 
     const env_block = env_block: {
         const prog_fd: i32 = -1;
@@ -4222,7 +4222,7 @@ fn spawn(ev: *Evented, options: process.SpawnOptions) process.SpawnError!Spawned
     // Therefore, we do all the allocation for the execve() before the fork().
     // This means we must do the null-termination of argv and env vars here.
     const argv_buf = try arena.allocSentinel(?[*:0]const u8, options.argv.len, null);
-    for (options.argv, 0..) |arg, i| argv_buf[i] = (try arena.dupeZ(u8, arg)).ptr;
+    for (options.argv, 0..) |arg, i| argv_buf[i] = (try arena.dupeSentinel(u8, arg, 0)).ptr;
 
     const env_block = env_block: {
         const prog_fd: i32 = if (prog_pipe[1] == -1) -1 else prog_fileno;
diff --git a/lib/std/Io/Threaded.zig b/lib/std/Io/Threaded.zig
index 7b0541f2b17ed7b991ba8cdb9f92dcf872660060..d32e5ca7bab34950226862f26c6647f6dae5821b 100644
--- a/lib/std/Io/Threaded.zig
+++ b/lib/std/Io/Threaded.zig
@@ -14954,7 +14954,7 @@ fn processReplace(userdata: ?*anyopaque, options: process.ReplaceOptions) proces
     const arena = arena_allocator.allocator();
 
     const argv_buf = try arena.allocSentinel(?[*:0]const u8, options.argv.len, null);
-    for (options.argv, 0..) |arg, i| argv_buf[i] = (try arena.dupeZ(u8, arg)).ptr;
+    for (options.argv, 0..) |arg, i| argv_buf[i] = (try arena.dupeSentinel(u8, arg, 0)).ptr;
 
     const env_block = env_block: {
         const prog_fd: i32 = -1;
@@ -15061,7 +15061,7 @@ fn spawnPosix(t: *Threaded, options: process.SpawnOptions) process.SpawnError!Sp
     // Therefore, we do all the allocation for the execve() before the fork().
     // This means we must do the null-termination of argv and env vars here.
     const argv_buf = try arena.allocSentinel(?[*:0]const u8, options.argv.len, null);
-    for (options.argv, 0..) |arg, i| argv_buf[i] = (try arena.dupeZ(u8, arg)).ptr;
+    for (options.argv, 0..) |arg, i| argv_buf[i] = (try arena.dupeSentinel(u8, arg, 0)).ptr;
 
     const prog_fileno = 3;
     comptime assert(@max(posix.STDIN_FILENO, posix.STDOUT_FILENO, posix.STDERR_FILENO) + 1 == prog_fileno);
diff --git a/lib/std/Io/Uring.zig b/lib/std/Io/Uring.zig
index fee0d218184a2d5b40980f9a0b8feb5e6e9399dc..7ab63f6711b326488d5a569a2145ff81751c2935 100644
--- a/lib/std/Io/Uring.zig
+++ b/lib/std/Io/Uring.zig
@@ -4226,7 +4226,7 @@ fn processReplace(userdata: ?*anyopaque, options: process.ReplaceOptions) proces
     const arena = arena_allocator.allocator();
 
     const argv_buf = try arena.allocSentinel(?[*:0]const u8, options.argv.len, null);
-    for (options.argv, 0..) |arg, i| argv_buf[i] = (try arena.dupeZ(u8, arg)).ptr;
+    for (options.argv, 0..) |arg, i| argv_buf[i] = (try arena.dupeSentinel(u8, arg, 0)).ptr;
 
     const env_block = env_block: {
         const prog_fd: i32 = -1;
@@ -4369,7 +4369,7 @@ fn spawn(ev: *Evented, options: process.SpawnOptions) process.SpawnError!Spawned
     // Therefore, we do all the allocation for the execve() before the fork().
     // This means we must do the null-termination of argv and env vars here.
     const argv_buf = try arena.allocSentinel(?[*:0]const u8, options.argv.len, null);
-    for (options.argv, 0..) |arg, i| argv_buf[i] = (try arena.dupeZ(u8, arg)).ptr;
+    for (options.argv, 0..) |arg, i| argv_buf[i] = (try arena.dupeSentinel(u8, arg, 0)).ptr;
 
     const env_block = env_block: {
         const prog_fd: i32 = if (prog_pipe[1] == -1) -1 else prog_fileno;
diff --git a/lib/std/debug.zig b/lib/std/debug.zig
index c700e9b060da71ad7056a9feffc5396300652c7a..b5653f77d082f726b2f791d298e84674f93a0c82 100644
--- a/lib/std/debug.zig
+++ b/lib/std/debug.zig
@@ -517,7 +517,7 @@ pub fn defaultPanic(msg: []const u8, first_trace_addr: ?usize) noreturn {
 
             if (uefi.system_table.boot_services) |bs| {
                 // ExitData buffer must be allocated using boot_services.allocatePool (spec: page 220)
-                const exit_data = uefi.raw_pool_allocator.dupeZ(u16, exit_msg) catch @trap();
+                const exit_data = uefi.raw_pool_allocator.dupeSentinel(u16, exit_msg, 0) catch @trap();
                 bs.exit(uefi.handle, .aborted, exit_data) catch {};
             }
             @trap();
diff --git a/lib/std/fs/test.zig b/lib/std/fs/test.zig
index 686ae840823e0ce4c12da76d4f8c8c5cb466b4c3..580804e1029bb4d4704ec1c56c928e89331956d2 100644
--- a/lib/std/fs/test.zig
+++ b/lib/std/fs/test.zig
@@ -135,7 +135,7 @@ const TestContext = struct {
         const allocator = self.arena.allocator();
         const transformed_path = try self.transform_fn(allocator, self.io, self.dir, relative_path);
         if (native_os == .windows) {
-            const transformed_sep_path = try allocator.dupeZ(u8, transformed_path);
+            const transformed_sep_path = try allocator.dupeSentinel(u8, transformed_path, 0);
             std.mem.replaceScalar(u8, transformed_sep_path, switch (self.path_sep) {
                 '/' => '\\',
                 '\\' => '/',
@@ -153,7 +153,7 @@ const TestContext = struct {
     pub fn toCanonicalPathSep(self: *TestContext, path: [:0]const u8) ![:0]const u8 {
         if (native_os == .windows) {
             const allocator = self.arena.allocator();
-            const transformed_sep_path = try allocator.dupeZ(u8, path);
+            const transformed_sep_path = try allocator.dupeSentinel(u8, path, 0);
             std.mem.replaceScalar(u8, transformed_sep_path, '/', '\\');
             return transformed_sep_path;
         }
diff --git a/lib/std/mem.zig b/lib/std/mem.zig
index 125f1688d3f1b41beb14e3259717555473beeb8d..f0b664f12e77ae032ada79b362c51decc3479f69 100644
--- a/lib/std/mem.zig
+++ b/lib/std/mem.zig
@@ -4964,7 +4964,7 @@ test isAligned {
 }
 
 test "freeing empty string with null-terminated sentinel" {
-    const empty_string = try testing.allocator.dupeZ(u8, "");
+    const empty_string = try testing.allocator.dupeSentinel(u8, "", 0);
     testing.allocator.free(empty_string);
 }
 
diff --git a/lib/std/mem/Allocator.zig b/lib/std/mem/Allocator.zig
index 00298ae71ee144513b3fec1481d0ffb52594b664..ec3426146cc0b93f1ea9b7e4a364cc61ab6d641f 100644
--- a/lib/std/mem/Allocator.zig
+++ b/lib/std/mem/Allocator.zig
@@ -456,12 +456,6 @@ pub fn dupe(allocator: Allocator, comptime T: type, m: []const T) Error![]T {
     return new_buf;
 }
 
-/// Deprecated in favor of `dupeSentinel`
-/// Copies `m` to newly allocated memory, with a null-terminated element. Caller owns the memory.
-pub fn dupeZ(allocator: Allocator, comptime T: type, m: []const T) Error![:0]T {
-    return allocator.dupeSentinel(T, m, 0);
-}
-
 /// Copies `m` to newly allocated memory, with a null-terminated element. Caller owns the memory.
 pub fn dupeSentinel(
     allocator: Allocator,
diff --git a/lib/std/os/plan9.zig b/lib/std/os/plan9.zig
index 36bf83b21c02f42bf1f24f439a355eea9df78a13..48e82c3e11405f5482b2b7b85a715ee7329faf08 100644
--- a/lib/std/os/plan9.zig
+++ b/lib/std/os/plan9.zig
@@ -299,7 +299,7 @@ pub fn openat(dirfd: i32, path: [*:0]const u8, flags: u32, _: mode_t) usize {
     const dir_path = std.mem.span(@as([*:0]u8, @ptrCast(&dir_path_buf)));
     const total_path = std.fs.path.join(alloc, &.{ dir_path, std.mem.span(path) }) catch unreachable; // the allocation shouldn't fail because it should not exceed max_path_bytes
     fba.reset();
-    const total_path_z = alloc.dupeZ(u8, total_path) catch unreachable; // should not exceed max_path_bytes + 1
+    const total_path_z = alloc.dupeSentinel(u8, total_path, 0) catch unreachable; // should not exceed max_path_bytes + 1
     return open(total_path_z.ptr, flags);
 }
 
diff --git a/lib/std/process.zig b/lib/std/process.zig
index 5807e79548706ed472b81b600e2d9001dedbbe20..bbcd2ccfe089d562083f9bf61f5c9e4839348dff 100644
--- a/lib/std/process.zig
+++ b/lib/std/process.zig
@@ -85,7 +85,7 @@ pub fn currentPathAlloc(io: Io, allocator: Allocator) CurrentPathAllocError![:0]
         error.NameTooLong => unreachable,
         else => |e| return e,
     };
-    return allocator.dupeZ(u8, buffer[0..n]);
+    return allocator.dupeSentinel(u8, buffer[0..n], 0);
 }
 
 test currentPathAlloc {
@@ -734,7 +734,7 @@ pub fn executablePathAlloc(io: Io, allocator: Allocator) ExecutablePathAllocErro
         error.NameTooLong => unreachable,
         else => |e| return e,
     };
-    return allocator.dupeZ(u8, buffer[0..n]);
+    return allocator.dupeSentinel(u8, buffer[0..n], 0);
 }
 
 pub const ExecutablePathError = ExecutablePathBaseError || error{NameTooLong};
diff --git a/lib/std/process/Environ.zig b/lib/std/process/Environ.zig
index 57d5ea02711885f583f60c65fd26adfb3712f11b..3f467a8db936c6ee0720e1921f46cebc08f0111f 100644
--- a/lib/std/process/Environ.zig
+++ b/lib/std/process/Environ.zig
@@ -754,7 +754,7 @@ pub fn createPosixBlock(
             },
             .nothing => {},
         };
-        envp[envp_len] = try gpa.dupeZ(u8, mem.span(entry));
+        envp[envp_len] = try gpa.dupeSentinel(u8, mem.span(entry), 0);
         envp_len += 1;
     }
 
diff --git a/lib/std/zig/LibCInstallation.zig b/lib/std/zig/LibCInstallation.zig
index 96265165bde27768ccbc318bc899071bf1c8c8c8..305b1be2783324e25b87dee08cd0cc0bc705d496 100644
--- a/lib/std/zig/LibCInstallation.zig
+++ b/lib/std/zig/LibCInstallation.zig
@@ -70,7 +70,7 @@ pub fn parse(allocator: Allocator, io: Io, libc_file: []const u8, target: *const
                 if (value.len == 0) {
                     @field(self, field.name) = null;
                 } else {
-                    found_keys[i].allocated = try allocator.dupeZ(u8, value);
+                    found_keys[i].allocated = try allocator.dupeSentinel(u8, value, 0);
                     @field(self, field.name) = found_keys[i].allocated;
                 }
                 break;
diff --git a/src/Compilation.zig b/src/Compilation.zig
index 67d845c4221fb8eced8e4224e60325adec1b3371..6e7bfe8be53aa89b795f8b78dd3babf799745a25 100644
--- a/src/Compilation.zig
+++ b/src/Compilation.zig
@@ -1869,7 +1869,7 @@ pub fn create(gpa: Allocator, arena: Allocator, io: Io, diag: *CreateDiagnostic,
     const comp: *Compilation = comp: {
         // We put the `Compilation` itself in the arena. Freeing the arena will free the module.
         // It's initialized later after we prepare the initialization options.
-        const root_name = try arena.dupeZ(u8, options.root_name);
+        const root_name = try arena.dupeSentinel(u8, options.root_name, 0);
 
         // The "any" values provided by resolved config only account for
         // explicitly-provided settings. We now make them additionally account
diff --git a/src/codegen/llvm.zig b/src/codegen/llvm.zig
index 847191ec1d67a51efc586ce87e209f6915e51f4b..aa611fc474fc279c8d15d4f1e3c609a93fcbe5fa 100644
--- a/src/codegen/llvm.zig
+++ b/src/codegen/llvm.zig
@@ -918,7 +918,7 @@ pub const Object = struct {
         }
 
         const target_triple_sentinel =
-            try o.gpa.dupeZ(u8, o.builder.target_triple.slice(&o.builder).?);
+            try o.gpa.dupeSentinel(u8, o.builder.target_triple.slice(&o.builder).?, 0);
         defer o.gpa.free(target_triple_sentinel);
 
         const emit_asm_msg = options.asm_path orelse "(none)";
diff --git a/src/link/Lld.zig b/src/link/Lld.zig
index eba1ee6a8dcec4289f8bb5579b6e7ad7e4cea79b..5eb1e4e4467318ba972c59809ce28f00b66a3e79 100644
--- a/src/link/Lld.zig
+++ b/src/link/Lld.zig
@@ -287,7 +287,7 @@ fn linkAsArchive(lld: *Lld, arena: Allocator) !void {
     const comp = base.comp;
     const directory = base.emit.root_dir; // Just an alias to make it shorter to type.
     const full_out_path = try directory.join(arena, &[_][]const u8{base.emit.sub_path});
-    const full_out_path_z = try arena.dupeZ(u8, full_out_path);
+    const full_out_path_z = try arena.dupeSentinel(u8, full_out_path, 0);
     const opt_zcu = comp.zcu;
 
     const zcu_obj_path: ?Cache.Path = if (opt_zcu != null) p: {
@@ -326,7 +326,7 @@ fn linkAsArchive(lld: *Lld, arena: Allocator) !void {
         object_files.appendAssumeCapacity(try key.status.success.object_path.toStringZ(arena));
     }
     for (comp.win32_resource_table.keys()) |key| {
-        object_files.appendAssumeCapacity(try arena.dupeZ(u8, key.status.success.res_path));
+        object_files.appendAssumeCapacity(try arena.dupeSentinel(u8, key.status.success.res_path, 0));
     }
     if (zcu_obj_path) |p| object_files.appendAssumeCapacity(try p.toStringZ(arena));
     if (compiler_rt_path) |p| object_files.appendAssumeCapacity(try p.toStringZ(arena));
diff --git a/src/main.zig b/src/main.zig
index 95ee9a82f15ac3b6591fe07bc061dd9c336b1f4e..68378d89e1715264e1e4a428318ec41727839205 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -5971,7 +5971,7 @@ extern "c" fn ZigLlvmAr_main(argc: c_int, argv: [*:null]?[*:0]u8) c_int;
 fn argsCopyZ(alloc: Allocator, args: []const []const u8) ![:null]?[*:0]u8 {
     var argv = try alloc.allocSentinel(?[*:0]u8, args.len, null);
     for (args, 0..) |arg, i| {
-        argv[i] = try alloc.dupeZ(u8, arg); // TODO If there was an argsAllocZ we could avoid this allocation.
+        argv[i] = try alloc.dupeSentinel(u8, arg, 0); // TODO If there was an argsAllocZ we could avoid this allocation.
     }
     return argv;
 }
@@ -6601,7 +6601,7 @@ fn cmdDumpLlvmInts(
     if (!build_options.have_llvm)
         fatal("compiler does not use LLVM; cannot dump LLVM integer sizes", .{});
 
-    const triple = try arena.dupeZ(u8, args[0]);
+    const triple = try arena.dupeSentinel(u8, args[0], 0);
 
     const llvm = @import("codegen/llvm/bindings.zig");
 
diff --git a/tools/docgen.zig b/tools/docgen.zig
index 33ab5ca3cba7fd2a27f887b29daf468aad32c5f7..ab9419d55ab98eff79e07c01a831f6ec07168728 100644
--- a/tools/docgen.zig
+++ b/tools/docgen.zig
@@ -679,7 +679,7 @@ fn tokenizeAndPrintRaw(
     raw_src: []const u8,
 ) !void {
     const src_non_terminated = mem.trim(u8, raw_src, " \r\n");
-    const src = try allocator.dupeZ(u8, src_non_terminated);
+    const src = try allocator.dupeSentinel(u8, src_non_terminated, 0);
 
     try out.writeAll("<code>");
     var tokenizer = std.zig.Tokenizer.init(src);
diff --git a/tools/doctest.zig b/tools/doctest.zig
index fde277118ef44b3f3407f788f3dee56561f72592..90c7108d297acaf6db6da02eb29b87af2ac151a9 100644
--- a/tools/doctest.zig
+++ b/tools/doctest.zig
@@ -607,7 +607,7 @@ fn printSourceBlock(arena: Allocator, out: *Writer, source_bytes: []const u8, na
 
 fn tokenizeAndPrint(arena: Allocator, out: *Writer, raw_src: []const u8) !void {
     const src_non_terminated = mem.trim(u8, raw_src, " \r\n");
-    const src = try arena.dupeZ(u8, src_non_terminated);
+    const src = try arena.dupeSentinel(u8, src_non_terminated, 0);
 
     try out.writeAll("<code>");
     var tokenizer = std.zig.Tokenizer.init(src);