diff --git a/script/tf-coverity/common-def.sh b/script/tf-coverity/common-def.sh
index dae1e83..6e17ea9 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-3.4.0"
+MBED_TLS_SOURCES_TAG="mbedtls-3.3.0"
 
 ARMCLANG_PATH="$(set_armclang_toolchain)"
 
diff --git a/utils.sh b/utils.sh
index e75a4df..d924a0d 100644
--- a/utils.sh
+++ b/utils.sh
@@ -639,7 +639,7 @@
 
 linaro_2001_release="${linaro_2001_release:-$tfa_downloads/linaro/20.01}"
 linaro_release="${linaro_release:-$linaro_2001_release}"
-mbedtls_version="${mbedtls_version:-3.4.0}"
+mbedtls_version="${mbedtls_version:-3.3.0}"
 
 # mbedTLS archive public hosting available at github.com
 mbedtls_archive="${mbedtls_archive:-https://github.com/Mbed-TLS/mbedtls/archive/mbedtls-${mbedtls_version}.tar.gz}"