diff --git a/src/core/tsi/alts/handshaker/alts_tsi_handshaker.h b/src/core/tsi/alts/handshaker/alts_tsi_handshaker.h
index e1ae985a84d..1c3605afc21 100644
--- a/src/core/tsi/alts/handshaker/alts_tsi_handshaker.h
+++ b/src/core/tsi/alts/handshaker/alts_tsi_handshaker.h
@@ -41,7 +41,7 @@ const size_t kTsiAltsNumOfPeerProperties = 5;
 // Frame size negotiation extends send frame size range to
 // [kTsiAltsMinFrameSize, kTsiAltsMaxFrameSize].
 const size_t kTsiAltsMinFrameSize = 16 * 1024;
-const size_t kTsiAltsMaxFrameSize = 128 * 1024;
+const size_t kTsiAltsMaxFrameSize = 1024 * 1024;
 
 typedef struct alts_tsi_handshaker alts_tsi_handshaker;
 
diff --git a/test/core/tsi/alts/handshaker/alts_tsi_handshaker_test.cc b/test/core/tsi/alts/handshaker/alts_tsi_handshaker_test.cc
index 54435b7cdf3..95a3dce71a6 100644
--- a/test/core/tsi/alts/handshaker/alts_tsi_handshaker_test.cc
+++ b/test/core/tsi/alts/handshaker/alts_tsi_handshaker_test.cc
@@ -52,7 +52,7 @@
 #define ALTS_TSI_HANDSHAKER_TEST_APPLICATION_PROTOCOL \
   "test application protocol"
 #define ALTS_TSI_HANDSHAKER_TEST_RECORD_PROTOCOL "test record protocol"
-#define ALTS_TSI_HANDSHAKER_TEST_MAX_FRAME_SIZE (256 * 1024)
+#define ALTS_TSI_HANDSHAKER_TEST_MAX_FRAME_SIZE (2 * 1024 * 1024)
 #define ALTS_TSI_HANDSHAKER_TEST_PEER_ATTRIBUTES_KEY "peer"
 #define ALTS_TSI_HANDSHAKER_TEST_PEER_ATTRIBUTES_VALUE "attributes"