diff --git a/examples/hello_world/CMakeLists.txt b/examples/hello_world/CMakeLists.txt
index 2eb39c6..2f5d648 100644
--- a/examples/hello_world/CMakeLists.txt
+++ b/examples/hello_world/CMakeLists.txt
@@ -14,12 +14,13 @@
 
 cmake_minimum_required(VERSION 3.11)
 project(hello_world)
+set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 include(FetchContent)
-FetchContent_Declare(highway GIT_REPOSITORY https://github.com/google/highway.git GIT_TAG c5bebf84ad01edec97e336f5c97ca4e0df6b4d06)
+FetchContent_Declare(highway GIT_REPOSITORY https://github.com/google/highway.git GIT_TAG bfc36a6e633af94e63ac4b91c687bf0354cb24e0)
 FetchContent_MakeAvailable(highway)
-FetchContent_Declare(sentencepiece GIT_REPOSITORY https://github.com/google/sentencepiece GIT_TAG 53de76561cfc149d3c01037f0595669ad32a5e7c)
+FetchContent_Declare(sentencepiece GIT_REPOSITORY https://github.com/google/sentencepiece GIT_TAG 9045b2f60fa2b323dfac0eaef8fc17565036f9f9)
 FetchContent_MakeAvailable(sentencepiece)
 
 
@@ -31,9 +32,9 @@ if (NOT BUILD_MODE)
 endif()
 if (BUILD_MODE STREQUAL "local")
   # Relative path to gemma.cpp from examples/hello_world/build/
-  FetchContent_Declare(gemma SOURCE_DIR ../../..) 
+  FetchContent_Declare(gemma SOURCE_DIR ../../..)
 else()
-  FetchContent_Declare(gemma GIT_REPOSITORY https://github.com/google/gemma.cpp.git GIT_TAG a9aa63fd2ea6b786ed0706d619588bfe2d43370e)
+  FetchContent_Declare(gemma GIT_REPOSITORY https://github.com/google/gemma.cpp.git GIT_TAG 4a924f179448dc83e46a2af9520c61b4ef56174c)
 endif()
 FetchContent_MakeAvailable(gemma)
 
diff --git a/examples/hello_world/README.md b/examples/hello_world/README.md
index f396c05..acfaa48 100644
--- a/examples/hello_world/README.md
+++ b/examples/hello_world/README.md
@@ -41,7 +41,7 @@ gemma.cpp specifying the tokenizer, compressed weights file, and model type, for
 example:
 
 ```sh
-./hello_world --tokenizer tokenizer.spm --compressed_weights 2b-it-sfp.sbs --model 2b-it
+./hello_world --tokenizer tokenizer.spm --weights 2b-it-sfp.sbs --model 2b-it
 ```
 
 Should print a greeting to the terminal:
diff --git a/examples/hello_world/run.cc b/examples/hello_world/run.cc
index fb2fea3..4eb8647 100644
--- a/examples/hello_world/run.cc
+++ b/examples/hello_world/run.cc
@@ -32,76 +32,76 @@
 #include "hwy/base.h"
 #include "hwy/contrib/thread_pool/thread_pool.h"
 
-int main(int argc, char** argv) {
-  {
-    // Placeholder for internal init, do not modify.
-  }
-
-  gcpp::LoaderArgs loader(argc, argv);
-  gcpp::InferenceArgs inference(argc, argv);
-  gcpp::AppArgs app(argc, argv);
-  if (gcpp::HasHelp(argc, argv)) {
-    loader.Help();
-    return 0;
-  } else if (const char* error = loader.Validate()) {
-    loader.Help();
-    HWY_ABORT("\nInvalid args: %s", error);
-  }
-
-  // Demonstrate constrained decoding by never outputting certain tokens.
-  std::set<int> reject_tokens;
-  for (int arg = 0; arg < argc; ++arg) {
-    // Find a --reject flag and consume everything after it.
-    if (strcmp(argv[arg], "--reject") == 0) {
-      while (++arg < argc) reject_tokens.insert(atoi(argv[arg]));
+int main(int argc, char **argv) { {
+        // Placeholder for internal init, do not modify.
     }
-  }
 
-  // Instantiate model and KV Cache
-  gcpp::BoundedTopology topology(gcpp::CreateTopology(app));
-  gcpp::NestedPools pools = gcpp::CreatePools(topology, app);
-  gcpp::MatMulEnv env(topology, pools);
-  gcpp::Gemma model = gcpp::CreateGemma(loader, env);
-  gcpp::KVCache kv_cache =
-      gcpp::KVCache::Create(model.GetModelConfig(),
-                            inference.prefill_tbatch_size);
-  size_t generated = 0;
-
-  // Initialize random number generator
-  std::mt19937 gen;
-  std::random_device rd;
-  gen.seed(rd());
-
-  // Tokenize instructions.
-  std::string prompt = "Write a greeting to the world.";
-  const std::vector<int> tokens = gcpp::WrapAndTokenize(
-      model.Tokenizer(), loader.Info(), generated, prompt);
-  const size_t prompt_size = tokens.size();
-
-  // This callback function gets invoked every time a token is generated
-  auto stream_token = [&generated, &prompt_size, &model](int token, float) {
-    ++generated;
-    if (generated < prompt_size) {
-      // print feedback
-    } else if (!model.GetModelConfig().IsEOS(token)) {
-      std::string token_text;
-      HWY_ASSERT(model.Tokenizer().Decode({token}, &token_text));
-      std::cout << token_text << std::flush;
+    gcpp::LoaderArgs loader(argc, argv);
+    gcpp::InferenceArgs inference(argc, argv);
+    gcpp::AppArgs app(argc, argv);
+    if (gcpp::HasHelp(argc, argv)) {
+        loader.Help();
+        return 0;
+    } else if (const char *error = loader.Validate()) {
+        loader.Help();
+        HWY_ABORT("\nInvalid args: %s", error);
     }
-    return true;
-  };
 
-  gcpp::TimingInfo timing_info;
-  gcpp::RuntimeConfig runtime_config = {
-      .max_generated_tokens = 1024,
-      .temperature = 1.0,
-      .gen = &gen,
-      .verbosity = 0,
-      .stream_token = stream_token,
-      .accept_token =
-          [&](int token, float /* prob */) {
-            return !reject_tokens.contains(token);
-          },
-  };
-  model.Generate(runtime_config, tokens, 0, kv_cache, timing_info);
+    // Demonstrate constrained decoding by never outputting certain tokens.
+    std::set<int> reject_tokens;
+    for (int arg = 0; arg < argc; ++arg) {
+        // Find a --reject flag and consume everything after it.
+        if (strcmp(argv[arg], "--reject") == 0) {
+            while (++arg < argc) reject_tokens.insert(atoi(argv[arg]));
+        }
+    }
+
+    // Instantiate model and KV Cache
+    gcpp::BoundedTopology topology(gcpp::CreateTopology(app));
+    gcpp::NestedPools pools = gcpp::CreatePools(topology, app);
+    gcpp::MatMulEnv env(topology, pools);
+    gcpp::Gemma model = gcpp::CreateGemma(loader, env);
+    gcpp::KVCache kv_cache =
+            gcpp::KVCache::Create(model.GetModelConfig(),
+                                  inference.prefill_tbatch_size);
+    size_t generated = 0;
+
+    // Initialize random number generator
+    std::mt19937 gen;
+    std::random_device rd;
+    gen.seed(rd());
+
+    // Tokenize instructions.
+    std::string prompt = "Write a greeting to the world.";
+    const std::vector<int> tokens = gcpp::WrapAndTokenize(
+        model.Tokenizer(), loader.Info(), generated, prompt);
+    const size_t prompt_size = tokens.size();
+
+    // This callback function gets invoked every time a token is generated
+    auto stream_token = [&generated, &prompt_size, &model](int token, float) {
+        ++generated;
+        if (generated < prompt_size) {
+            // print feedback
+        } else if (!model.GetModelConfig().IsEOS(token)) {
+            std::string token_text;
+            HWY_ASSERT(model.Tokenizer().Decode({token}, &token_text));
+            std::cout << token_text << std::flush;
+        }
+        return true;
+    };
+
+    gcpp::TimingInfo timing_info;
+    gcpp::RuntimeConfig runtime_config = {
+        .max_generated_tokens = 1024,
+        .temperature = 1.0,
+        .gen = &gen,
+        .verbosity = 0,
+        .stream_token = stream_token,
+        .accept_token =
+        std::function<bool(int, float)>(
+            [&](int token, float /* prob */) {
+                return reject_tokens.find(token) == reject_tokens.end();
+            }),
+    };
+    model.Generate(runtime_config, tokens, 0, kv_cache, timing_info);
 }