diff --git a/quic/core/crypto/crypto_secret_boxer.h b/quic/core/crypto/crypto_secret_boxer.h
index 395d389..d3ae035 100644
--- a/quic/core/crypto/crypto_secret_boxer.h
+++ b/quic/core/crypto/crypto_secret_boxer.h
@@ -59,7 +59,7 @@
 
   // state_ is an opaque pointer to whatever additional state the concrete
   // implementation of CryptoSecretBoxer requires.
-  std::unique_ptr<State> state_ GUARDED_BY(lock_);
+  std::unique_ptr<State> state_ ABSL_GUARDED_BY(lock_);
 };
 
 }  // namespace quic
diff --git a/quic/core/crypto/quic_crypto_server_config.h b/quic/core/crypto/quic_crypto_server_config.h
index d8d9cab..f9ace68 100644
--- a/quic/core/crypto/quic_crypto_server_config.h
+++ b/quic/core/crypto/quic_crypto_server_config.h
@@ -508,7 +508,7 @@
   // Get a ref to the config with a given server config id.
   QuicReferenceCountedPointer<Config> GetConfigWithScid(
       QuicStringPiece requested_scid) const
-      SHARED_LOCKS_REQUIRED(configs_lock_);
+      ABSL_SHARED_LOCKS_REQUIRED(configs_lock_);
 
   // A snapshot of the configs associated with an in-progress handshake.
   struct Configs {
@@ -537,7 +537,7 @@
   // SelectNewPrimaryConfig reevaluates the primary config based on the
   // "primary_time" deadlines contained in each.
   void SelectNewPrimaryConfig(QuicWallTime now) const
-      EXCLUSIVE_LOCKS_REQUIRED(configs_lock_);
+      ABSL_EXCLUSIVE_LOCKS_REQUIRED(configs_lock_);
 
   // EvaluateClientHello checks |client_hello_state->client_hello| for gross
   // errors and determines whether it is fresh (i.e. not a replay). The results
@@ -850,7 +850,7 @@
 
   // Returns true if the next config promotion should happen now.
   bool IsNextConfigReady(QuicWallTime now) const
-      SHARED_LOCKS_REQUIRED(configs_lock_);
+      ABSL_SHARED_LOCKS_REQUIRED(configs_lock_);
 
   // replay_protection_ controls whether the server enforces that handshakes
   // aren't replays.
@@ -869,12 +869,12 @@
 
   // configs_ contains all active server configs. It's expected that there are
   // about half-a-dozen configs active at any one time.
-  ConfigMap configs_ GUARDED_BY(configs_lock_);
+  ConfigMap configs_ ABSL_GUARDED_BY(configs_lock_);
 
   // primary_config_ points to a Config (which is also in |configs_|) which is
   // the primary config - i.e. the one that we'll give out to new clients.
   mutable QuicReferenceCountedPointer<Config> primary_config_
-      GUARDED_BY(configs_lock_);
+      ABSL_GUARDED_BY(configs_lock_);
 
   // fallback_config_ points to a Config (which is also in |configs_|) which is
   // the fallback config, which will be used if the other configs are unuseable
@@ -882,15 +882,16 @@
   //
   // TODO(b/112548056): This is currently always nullptr.
   QuicReferenceCountedPointer<Config> fallback_config_
-      GUARDED_BY(configs_lock_);
+      ABSL_GUARDED_BY(configs_lock_);
 
   // next_config_promotion_time_ contains the nearest, future time when an
   // active config will be promoted to primary.
-  mutable QuicWallTime next_config_promotion_time_ GUARDED_BY(configs_lock_);
+  mutable QuicWallTime next_config_promotion_time_
+      ABSL_GUARDED_BY(configs_lock_);
 
   // Callback to invoke when the primary config changes.
   std::unique_ptr<PrimaryConfigChangedCallback> primary_config_changed_cb_
-      GUARDED_BY(configs_lock_);
+      ABSL_GUARDED_BY(configs_lock_);
 
   // Used to protect the source-address tokens that are given to clients.
   CryptoSecretBoxer source_address_token_boxer_;
diff --git a/quic/platform/api/quic_mutex.h b/quic/platform/api/quic_mutex.h
index 162863a..86e8f67 100644
--- a/quic/platform/api/quic_mutex.h
+++ b/quic/platform/api/quic_mutex.h
@@ -10,28 +10,28 @@
 namespace quic {
 
 // A class representing a non-reentrant mutex in QUIC.
-class LOCKABLE QUIC_EXPORT_PRIVATE QuicMutex {
+class ABSL_LOCKABLE QUIC_EXPORT_PRIVATE QuicMutex {
  public:
   QuicMutex() = default;
   QuicMutex(const QuicMutex&) = delete;
   QuicMutex& operator=(const QuicMutex&) = delete;
 
   // Block until this Mutex is free, then acquire it exclusively.
-  void WriterLock() EXCLUSIVE_LOCK_FUNCTION();
+  void WriterLock() ABSL_EXCLUSIVE_LOCK_FUNCTION();
 
   // Release this Mutex. Caller must hold it exclusively.
-  void WriterUnlock() UNLOCK_FUNCTION();
+  void WriterUnlock() ABSL_UNLOCK_FUNCTION();
 
   // Block until this Mutex is free or shared, then acquire a share of it.
-  void ReaderLock() SHARED_LOCK_FUNCTION();
+  void ReaderLock() ABSL_SHARED_LOCK_FUNCTION();
 
   // Release this Mutex. Caller could hold it in shared mode.
-  void ReaderUnlock() UNLOCK_FUNCTION();
+  void ReaderUnlock() ABSL_UNLOCK_FUNCTION();
 
   // Returns immediately if current thread holds the Mutex in at least shared
   // mode.  Otherwise, may report an error (typically by crashing with a
   // diagnostic), or may return immediately.
-  void AssertReaderHeld() const ASSERT_SHARED_LOCK();
+  void AssertReaderHeld() const ABSL_ASSERT_SHARED_LOCK();
 
  private:
   QuicLockImpl impl_;
@@ -39,13 +39,13 @@
 
 // A helper class that acquires the given QuicMutex shared lock while the
 // QuicReaderMutexLock is in scope.
-class SCOPED_LOCKABLE QUIC_EXPORT_PRIVATE QuicReaderMutexLock {
+class ABSL_SCOPED_LOCKABLE QUIC_EXPORT_PRIVATE QuicReaderMutexLock {
  public:
-  explicit QuicReaderMutexLock(QuicMutex* lock) SHARED_LOCK_FUNCTION(lock);
+  explicit QuicReaderMutexLock(QuicMutex* lock) ABSL_SHARED_LOCK_FUNCTION(lock);
   QuicReaderMutexLock(const QuicReaderMutexLock&) = delete;
   QuicReaderMutexLock& operator=(const QuicReaderMutexLock&) = delete;
 
-  ~QuicReaderMutexLock() UNLOCK_FUNCTION();
+  ~QuicReaderMutexLock() ABSL_UNLOCK_FUNCTION();
 
  private:
   QuicMutex* const lock_;
@@ -53,13 +53,14 @@
 
 // A helper class that acquires the given QuicMutex exclusive lock while the
 // QuicWriterMutexLock is in scope.
-class SCOPED_LOCKABLE QUIC_EXPORT_PRIVATE QuicWriterMutexLock {
+class ABSL_SCOPED_LOCKABLE QUIC_EXPORT_PRIVATE QuicWriterMutexLock {
  public:
-  explicit QuicWriterMutexLock(QuicMutex* lock) EXCLUSIVE_LOCK_FUNCTION(lock);
+  explicit QuicWriterMutexLock(QuicMutex* lock)
+      ABSL_EXCLUSIVE_LOCK_FUNCTION(lock);
   QuicWriterMutexLock(const QuicWriterMutexLock&) = delete;
   QuicWriterMutexLock& operator=(const QuicWriterMutexLock&) = delete;
 
-  ~QuicWriterMutexLock() UNLOCK_FUNCTION();
+  ~QuicWriterMutexLock() ABSL_UNLOCK_FUNCTION();
 
  private:
   QuicMutex* const lock_;
diff --git a/quic/test_tools/packet_dropping_test_writer.h b/quic/test_tools/packet_dropping_test_writer.h
index 92c8956..bbccd78 100644
--- a/quic/test_tools/packet_dropping_test_writer.h
+++ b/quic/test_tools/packet_dropping_test_writer.h
@@ -161,14 +161,14 @@
   uint64_t num_calls_to_write_;
 
   QuicMutex config_mutex_;
-  int32_t fake_packet_loss_percentage_ GUARDED_BY(config_mutex_);
-  int32_t fake_drop_first_n_packets_ GUARDED_BY(config_mutex_);
-  int32_t fake_blocked_socket_percentage_ GUARDED_BY(config_mutex_);
-  int32_t fake_packet_reorder_percentage_ GUARDED_BY(config_mutex_);
-  QuicTime::Delta fake_packet_delay_ GUARDED_BY(config_mutex_);
-  QuicBandwidth fake_bandwidth_ GUARDED_BY(config_mutex_);
-  QuicByteCount buffer_size_ GUARDED_BY(config_mutex_);
-  int32_t num_consecutive_packet_lost_ GUARDED_BY(config_mutex_);
+  int32_t fake_packet_loss_percentage_ ABSL_GUARDED_BY(config_mutex_);
+  int32_t fake_drop_first_n_packets_ ABSL_GUARDED_BY(config_mutex_);
+  int32_t fake_blocked_socket_percentage_ ABSL_GUARDED_BY(config_mutex_);
+  int32_t fake_packet_reorder_percentage_ ABSL_GUARDED_BY(config_mutex_);
+  QuicTime::Delta fake_packet_delay_ ABSL_GUARDED_BY(config_mutex_);
+  QuicBandwidth fake_bandwidth_ ABSL_GUARDED_BY(config_mutex_);
+  QuicByteCount buffer_size_ ABSL_GUARDED_BY(config_mutex_);
+  int32_t num_consecutive_packet_lost_ ABSL_GUARDED_BY(config_mutex_);
 };
 
 }  // namespace test
diff --git a/quic/test_tools/quic_crypto_server_config_peer.h b/quic/test_tools/quic_crypto_server_config_peer.h
index 3f5a984..6eed475 100644
--- a/quic/test_tools/quic_crypto_server_config_peer.h
+++ b/quic/test_tools/quic_crypto_server_config_peer.h
@@ -73,7 +73,7 @@
   // ConfigsDebug returns a std::string that contains debugging information
   // about the set of Configs loaded in |server_config_| and their status.
   std::string ConfigsDebug()
-      SHARED_LOCKS_REQUIRED(server_config_->configs_lock_);
+      ABSL_SHARED_LOCKS_REQUIRED(server_config_->configs_lock_);
 
   void SelectNewPrimaryConfig(int seconds);
 
diff --git a/quic/test_tools/server_thread.h b/quic/test_tools/server_thread.h
index ffbce7f..a55ecb3 100644
--- a/quic/test_tools/server_thread.h
+++ b/quic/test_tools/server_thread.h
@@ -73,13 +73,13 @@
   std::unique_ptr<QuicServer> server_;
   QuicSocketAddress address_;
   mutable QuicMutex port_lock_;
-  int port_ GUARDED_BY(port_lock_);
+  int port_ ABSL_GUARDED_BY(port_lock_);
 
   bool initialized_;
 
   QuicMutex scheduled_actions_lock_;
   QuicDeque<std::function<void()>> scheduled_actions_
-      GUARDED_BY(scheduled_actions_lock_);
+      ABSL_GUARDED_BY(scheduled_actions_lock_);
 };
 
 }  // namespace test
diff --git a/quic/tools/quic_memory_cache_backend.h b/quic/tools/quic_memory_cache_backend.h
index ff76c9a..7249bc0 100644
--- a/quic/tools/quic_memory_cache_backend.h
+++ b/quic/tools/quic_memory_cache_backend.h
@@ -177,15 +177,15 @@
 
   // Cached responses.
   QuicUnorderedMap<std::string, std::unique_ptr<QuicBackendResponse>> responses_
-      GUARDED_BY(response_mutex_);
+      ABSL_GUARDED_BY(response_mutex_);
 
   // The default response for cache misses, if set.
   std::unique_ptr<QuicBackendResponse> default_response_
-      GUARDED_BY(response_mutex_);
+      ABSL_GUARDED_BY(response_mutex_);
 
   // A map from request URL to associated server push responses (if any).
   std::multimap<std::string, QuicBackendResponse::ServerPushInfo>
-      server_push_resources_ GUARDED_BY(response_mutex_);
+      server_push_resources_ ABSL_GUARDED_BY(response_mutex_);
 
   // Protects against concurrent access from test threads setting responses, and
   // server threads accessing those responses.