diff --git a/tls/client-tls13.c b/tls/client-tls13.c
index ba073920..b8cd5775 100644
--- a/tls/client-tls13.c
+++ b/tls/client-tls13.c
@@ -38,7 +38,7 @@
 
 #define DEFAULT_PORT 11111
 
-#define CERT_FILE "../certs/ca-cert.pem"
+#define CERT_FILE "../certs/falcon_level5_root_cert.pem"
 
 #if defined(WOLFSSL_TLS13) && defined(HAVE_SECRET_CALLBACK)
 
@@ -185,6 +185,13 @@ int main(int argc, char** argv)
         ret = -1; goto exit;
     }
 
+    ret = wolfSSL_UseKeyShare(ssl, WOLFSSL_P521_KYBER_LEVEL5);
+    if (ret < 0) {
+        fprintf(stderr, "ERROR: failed to set the requested group to "
+                        "P521_KYBER_LEVEL5.\n");
+        ret = -1; goto exit;
+    }
+
     /* Attach wolfSSL to the socket */
     if ((ret = wolfSSL_set_fd(ssl, sockfd)) != WOLFSSL_SUCCESS) {
         fprintf(stderr, "ERROR: Failed to set the file descriptor\n");
diff --git a/tls/server-tls13.c b/tls/server-tls13.c
index bf05d50a..072c7fc9 100644
--- a/tls/server-tls13.c
+++ b/tls/server-tls13.c
@@ -43,8 +43,8 @@
 
 #define DEFAULT_PORT 11111
 
-#define CERT_FILE "../certs/server-cert.pem"
-#define KEY_FILE  "../certs/server-key.pem"
+#define CERT_FILE "../certs/falcon_level5_entity_cert.pem"
+#define KEY_FILE  "../certs/falcon_level5_entity_key.pem"
 
 
 #if defined(WOLFSSL_TLS13) && defined(HAVE_SECRET_CALLBACK)
@@ -229,6 +229,13 @@ int main(int argc, char** argv)
             ret = -1; goto exit;
         }
 
+        ret = wolfSSL_UseKeyShare(ssl, WOLFSSL_P521_KYBER_LEVEL5);
+        if (ret < 0) {
+            fprintf(stderr, "ERROR: failed to set the requested group to "
+                            "P521_KYBER_LEVEL5.\n");
+            ret = -1; goto exit;
+        }
+
         /* Attach wolfSSL to the socket */
         wolfSSL_set_fd(ssl, mConnd);