diff --git a/ci/musca-b1.yml b/ci/musca-b1.yml
index 1437b8ab..c2c3a986 100644
--- a/ci/musca-b1.yml
+++ b/ci/musca-b1.yml
@@ -6,6 +6,11 @@ header:
     - ci/base.yml
     - ci/meta-openembedded.yml
 
+local_conf_header:
+  version_for_ci: |
+    # For better CI coverage, use the LTS version of tf-m
+    PREFERRED_VERSION_trusted-firmware-m ?= "2.1.%"
+
 machine: musca-b1
 
 target: