diff --git a/quic/core/quic_dispatcher_test.cc b/quic/core/quic_dispatcher_test.cc
index f8c07dc..a05dd09 100644
--- a/quic/core/quic_dispatcher_test.cc
+++ b/quic/core/quic_dispatcher_test.cc
@@ -933,7 +933,6 @@
 TEST_F(QuicDispatcherTest, SupportedTransportVersionsChangeInFlight) {
   static_assert(QUIC_ARRAYSIZE(kSupportedTransportVersions) == 6u,
                 "Supported versions out of sync");
-  SetQuicReloadableFlag(quic_enable_version_49, true);
   SetQuicReloadableFlag(quic_enable_version_50, true);
   SetQuicReloadableFlag(quic_enable_version_99, true);
 
@@ -952,16 +951,6 @@
   SetQuicReloadableFlag(quic_enable_version_50, true);
   VerifyVersionSupported(
       ParsedQuicVersion(PROTOCOL_QUIC_CRYPTO, QUIC_VERSION_50));
-
-  // Turn off version 49.
-  SetQuicReloadableFlag(quic_enable_version_49, false);
-  VerifyVersionNotSupported(
-      ParsedQuicVersion(PROTOCOL_QUIC_CRYPTO, QUIC_VERSION_49));
-
-  // Turn on version 49.
-  SetQuicReloadableFlag(quic_enable_version_49, true);
-  VerifyVersionSupported(
-      ParsedQuicVersion(PROTOCOL_QUIC_CRYPTO, QUIC_VERSION_49));
 }
 
 TEST_F(QuicDispatcherTest, RejectDeprecatedVersionsWithVersionNegotiation) {
diff --git a/quic/core/quic_version_manager.cc b/quic/core/quic_version_manager.cc
index d9bc268..476bbc7 100644
--- a/quic/core/quic_version_manager.cc
+++ b/quic/core/quic_version_manager.cc
@@ -17,7 +17,6 @@
     ParsedQuicVersionVector supported_versions)
     : enable_version_99_(GetQuicReloadableFlag(quic_enable_version_99)),
       enable_version_50_(GetQuicReloadableFlag(quic_enable_version_50)),
-      enable_version_49_(GetQuicReloadableFlag(quic_enable_version_49)),
       enable_tls_(GetQuicReloadableFlag(quic_supports_tls_handshake)),
       allowed_supported_versions_(std::move(supported_versions)) {
   static_assert(QUIC_ARRAYSIZE(kSupportedTransportVersions) == 6u,
@@ -43,11 +42,9 @@
                 "Supported versions out of sync");
   if (enable_version_99_ != GetQuicReloadableFlag(quic_enable_version_99) ||
       enable_version_50_ != GetQuicReloadableFlag(quic_enable_version_50) ||
-      enable_version_49_ != GetQuicReloadableFlag(quic_enable_version_49) ||
       enable_tls_ != GetQuicReloadableFlag(quic_supports_tls_handshake)) {
     enable_version_99_ = GetQuicReloadableFlag(quic_enable_version_99);
     enable_version_50_ = GetQuicReloadableFlag(quic_enable_version_50);
-    enable_version_49_ = GetQuicReloadableFlag(quic_enable_version_49);
     enable_tls_ = GetQuicReloadableFlag(quic_supports_tls_handshake);
     RefilterSupportedVersions();
   }
diff --git a/quic/core/quic_version_manager.h b/quic/core/quic_version_manager.h
index 79e5898..0851464 100644
--- a/quic/core/quic_version_manager.h
+++ b/quic/core/quic_version_manager.h
@@ -45,8 +45,6 @@
   bool enable_version_99_;
   // quic_enable_version_50 flag
   bool enable_version_50_;
-  // quic_enable_version_49 flag
-  bool enable_version_49_;
   // quic_supports_tls_handshake flag
   bool enable_tls_;
 
diff --git a/quic/core/quic_version_manager_test.cc b/quic/core/quic_version_manager_test.cc
index a01316f..48623a8 100644
--- a/quic/core/quic_version_manager_test.cc
+++ b/quic/core/quic_version_manager_test.cc
@@ -20,17 +20,11 @@
                 "Supported versions out of sync");
   SetQuicReloadableFlag(quic_enable_version_99, false);
   SetQuicReloadableFlag(quic_enable_version_50, false);
-  SetQuicReloadableFlag(quic_enable_version_49, false);
   QuicVersionManager manager(AllSupportedVersions());
 
   EXPECT_EQ(FilterSupportedTransportVersions(AllSupportedTransportVersions()),
             manager.GetSupportedTransportVersions());
 
-  EXPECT_EQ(QuicTransportVersionVector(
-                {QUIC_VERSION_48, QUIC_VERSION_46, QUIC_VERSION_43}),
-            manager.GetSupportedTransportVersions());
-
-  SetQuicReloadableFlag(quic_enable_version_49, true);
   EXPECT_EQ(QuicTransportVersionVector({QUIC_VERSION_49, QUIC_VERSION_48,
                                         QUIC_VERSION_46, QUIC_VERSION_43}),
             manager.GetSupportedTransportVersions());
diff --git a/quic/core/quic_versions.cc b/quic/core/quic_versions.cc
index b68c988..5b9e8f1 100644
--- a/quic/core/quic_versions.cc
+++ b/quic/core/quic_versions.cc
@@ -270,10 +270,6 @@
       if (GetQuicReloadableFlag(quic_enable_version_50)) {
         filtered_versions.push_back(version);
       }
-    } else if (version.transport_version == QUIC_VERSION_49) {
-      if (GetQuicReloadableFlag(quic_enable_version_49)) {
-        filtered_versions.push_back(version);
-      }
     } else {
       filtered_versions.push_back(version);
     }
@@ -478,9 +474,6 @@
   if (parsed_version.transport_version == QUIC_VERSION_50) {
     SetQuicReloadableFlag(quic_enable_version_50, true);
   }
-  if (parsed_version.transport_version == QUIC_VERSION_49) {
-    SetQuicReloadableFlag(quic_enable_version_49, true);
-  }
 }
 
 #undef RETURN_STRING_LITERAL  // undef for jumbo builds
diff --git a/quic/core/quic_versions_test.cc b/quic/core/quic_versions_test.cc
index 02aa15f..283113f 100644
--- a/quic/core/quic_versions_test.cc
+++ b/quic/core/quic_versions_test.cc
@@ -280,7 +280,6 @@
   QuicTransportVersionVector all_versions = AllSupportedTransportVersions();
   static_assert(QUIC_ARRAYSIZE(kSupportedTransportVersions) == 6u,
                 "Supported versions out of sync");
-  SetQuicReloadableFlag(quic_enable_version_49, true);
   SetQuicReloadableFlag(quic_enable_version_50, true);
   SetQuicReloadableFlag(quic_enable_version_99, true);
   ParsedQuicVersionVector parsed_versions;
@@ -304,7 +303,6 @@
   QuicTransportVersionVector all_versions = AllSupportedTransportVersions();
   static_assert(QUIC_ARRAYSIZE(kSupportedTransportVersions) == 6u,
                 "Supported versions out of sync");
-  SetQuicReloadableFlag(quic_enable_version_49, true);
   SetQuicReloadableFlag(quic_enable_version_50, true);
   SetQuicReloadableFlag(quic_enable_version_99, false);
   ParsedQuicVersionVector parsed_versions;
@@ -326,7 +324,6 @@
 
 TEST_F(QuicVersionsTest, FilterSupportedTransportVersionsNo50) {
   QuicTransportVersionVector all_versions = AllSupportedTransportVersions();
-  SetQuicReloadableFlag(quic_enable_version_49, true);
   SetQuicReloadableFlag(quic_enable_version_50, false);
   SetQuicReloadableFlag(quic_enable_version_99, false);
   ParsedQuicVersionVector parsed_versions;
@@ -345,34 +342,10 @@
   ASSERT_EQ(expected_parsed_versions, FilterSupportedVersions(parsed_versions));
 }
 
-TEST_F(QuicVersionsTest, FilterSupportedTransportVersionsNo49) {
-  QuicTransportVersionVector all_versions = AllSupportedTransportVersions();
-  static_assert(QUIC_ARRAYSIZE(kSupportedTransportVersions) == 6u,
-                "Supported versions out of sync");
-  SetQuicReloadableFlag(quic_enable_version_49, false);
-  SetQuicReloadableFlag(quic_enable_version_50, false);
-  SetQuicReloadableFlag(quic_enable_version_99, false);
-  ParsedQuicVersionVector parsed_versions;
-  for (QuicTransportVersion version : all_versions) {
-    parsed_versions.push_back(ParsedQuicVersion(PROTOCOL_QUIC_CRYPTO, version));
-  }
-  QuicTransportVersionVector expected_versions = {
-      QUIC_VERSION_48, QUIC_VERSION_46, QUIC_VERSION_43};
-  ParsedQuicVersionVector expected_parsed_versions;
-  for (QuicTransportVersion version : expected_versions) {
-    expected_parsed_versions.push_back(
-        ParsedQuicVersion(PROTOCOL_QUIC_CRYPTO, version));
-  }
-
-  ASSERT_EQ(expected_versions, FilterSupportedTransportVersions(all_versions));
-  ASSERT_EQ(expected_parsed_versions, FilterSupportedVersions(parsed_versions));
-}
-
 TEST_F(QuicVersionsTest, FilterSupportedTransportVersionsNoFlags) {
   QuicTransportVersionVector all_versions = AllSupportedTransportVersions();
   static_assert(QUIC_ARRAYSIZE(kSupportedTransportVersions) == 6u,
                 "Supported versions out of sync");
-  SetQuicReloadableFlag(quic_enable_version_49, false);
   SetQuicReloadableFlag(quic_enable_version_50, false);
   SetQuicReloadableFlag(quic_enable_version_99, false);
   ParsedQuicVersionVector parsed_versions;
@@ -380,7 +353,7 @@
     parsed_versions.push_back(ParsedQuicVersion(PROTOCOL_QUIC_CRYPTO, version));
   }
   QuicTransportVersionVector expected_versions = {
-      QUIC_VERSION_48, QUIC_VERSION_46, QUIC_VERSION_43};
+      QUIC_VERSION_49, QUIC_VERSION_48, QUIC_VERSION_46, QUIC_VERSION_43};
   ParsedQuicVersionVector expected_parsed_versions;
   for (QuicTransportVersion version : expected_versions) {
     expected_parsed_versions.push_back(
@@ -473,10 +446,6 @@
   static_assert(QUIC_ARRAYSIZE(kSupportedTransportVersions) == 6u,
                 "Supported versions out of sync");
   SetQuicReloadableFlag(quic_supports_tls_handshake, true);
-  ParsedQuicVersion parsed_version_q049 =
-      ParsedQuicVersion(PROTOCOL_QUIC_CRYPTO, QUIC_VERSION_49);
-  ParsedQuicVersion parsed_version_t049 =
-      ParsedQuicVersion(PROTOCOL_TLS1_3, QUIC_VERSION_49);
   ParsedQuicVersion parsed_version_q050 =
       ParsedQuicVersion(PROTOCOL_QUIC_CRYPTO, QUIC_VERSION_50);
   ParsedQuicVersion parsed_version_t050 =
@@ -484,7 +453,6 @@
   ParsedQuicVersion parsed_version_t099 =
       ParsedQuicVersion(PROTOCOL_TLS1_3, QUIC_VERSION_99);
   SetQuicReloadableFlag(quic_supports_tls_handshake, false);
-  SetQuicReloadableFlag(quic_enable_version_49, false);
   SetQuicReloadableFlag(quic_enable_version_50, false);
   SetQuicReloadableFlag(quic_enable_version_99, false);
 
@@ -506,22 +474,6 @@
 
   {
     QuicFlagSaver flag_saver;
-    QuicEnableVersion(parsed_version_q049);
-    EXPECT_FALSE(GetQuicReloadableFlag(quic_supports_tls_handshake));
-    EXPECT_TRUE(GetQuicReloadableFlag(quic_enable_version_49));
-    EXPECT_FALSE(GetQuicReloadableFlag(quic_enable_version_99));
-  }
-
-  {
-    QuicFlagSaver flag_saver;
-    QuicEnableVersion(parsed_version_t049);
-    EXPECT_TRUE(GetQuicReloadableFlag(quic_supports_tls_handshake));
-    EXPECT_TRUE(GetQuicReloadableFlag(quic_enable_version_49));
-    EXPECT_FALSE(GetQuicReloadableFlag(quic_enable_version_99));
-  }
-
-  {
-    QuicFlagSaver flag_saver;
     QuicEnableVersion(parsed_version_t099);
     EXPECT_TRUE(GetQuicReloadableFlag(quic_supports_tls_handshake));
     EXPECT_FALSE(GetQuicReloadableFlag(quic_enable_version_50));