diff --git a/script/tf-coverity/common-def.sh b/script/tf-coverity/common-def.sh
index 6e17ea9..dae1e83 100644
--- a/script/tf-coverity/common-def.sh
+++ b/script/tf-coverity/common-def.sh
@@ -80,7 +80,7 @@
 
 # mbed TLS source tag to checkout when building Trusted Firmware with
 # cryptography support (e.g. for Trusted Board Boot feature).
-MBED_TLS_SOURCES_TAG="mbedtls-3.3.0"
+MBED_TLS_SOURCES_TAG="mbedtls-3.4.0"
 
 ARMCLANG_PATH="$(set_armclang_toolchain)"