diff --git a/docs/getting_started/prerequisites.rst b/docs/getting_started/prerequisites.rst
index 91ecdf31c..e2c527e72 100644
--- a/docs/getting_started/prerequisites.rst
+++ b/docs/getting_started/prerequisites.rst
@@ -60,7 +60,7 @@ supporting tools:
 
 The following libraries are required for Trusted Board Boot support:
 
-- mbed TLS == 2.24.0 (tag: ``mbedtls-2.24.0``)
+- mbed TLS == 2.26.0 (tag: ``mbedtls-2.26.0``)
 
 These tools are optional: