diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 6ba3e69..fc8e8c6 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -5254,7 +5254,7 @@
          (SSL_SERIALIZED_SESSION_CONFIG_ETM << SSL_SERIALIZED_SESSION_CONFIG_ETM_BIT) | \
          (SSL_SERIALIZED_SESSION_CONFIG_TICKET << SSL_SERIALIZED_SESSION_CONFIG_TICKET_BIT)))
 
-static unsigned char ssl_serialized_session_header[] = {
+static const unsigned char ssl_serialized_session_header[] = {
     MBEDTLS_VERSION_MAJOR,
     MBEDTLS_VERSION_MINOR,
     MBEDTLS_VERSION_PATCH,
@@ -6123,7 +6123,7 @@
          (SSL_SERIALIZED_CONTEXT_CONFIG_ALPN << SSL_SERIALIZED_CONTEXT_CONFIG_ALPN_BIT) | \
          0u))
 
-static unsigned char ssl_serialized_context_header[] = {
+static const unsigned char ssl_serialized_context_header[] = {
     MBEDTLS_VERSION_MAJOR,
     MBEDTLS_VERSION_MINOR,
     MBEDTLS_VERSION_PATCH,
@@ -6821,7 +6821,7 @@
 }
 
 #if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
-static int ssl_preset_default_hashes[] = {
+static const int ssl_preset_default_hashes[] = {
 #if defined(MBEDTLS_SHA512_C)
     MBEDTLS_MD_SHA512,
 #endif
@@ -6839,14 +6839,14 @@
 };
 #endif
 
-static int ssl_preset_suiteb_ciphersuites[] = {
+static const int ssl_preset_suiteb_ciphersuites[] = {
     MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
     MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
     0
 };
 
 #if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
-static int ssl_preset_suiteb_hashes[] = {
+static const int ssl_preset_suiteb_hashes[] = {
     MBEDTLS_MD_SHA256,
     MBEDTLS_MD_SHA384,
     MBEDTLS_MD_NONE
@@ -6854,7 +6854,7 @@
 #endif
 
 #if defined(MBEDTLS_ECP_C)
-static mbedtls_ecp_group_id ssl_preset_suiteb_curves[] = {
+static const mbedtls_ecp_group_id ssl_preset_suiteb_curves[] = {
 #if defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED)
     MBEDTLS_ECP_DP_SECP256R1,
 #endif