diff --git a/scripts/requirements-base.txt b/scripts/requirements-base.txt
index 00494ee4347..6682fcdbbfa 100644
--- a/scripts/requirements-base.txt
+++ b/scripts/requirements-base.txt
@@ -7,9 +7,12 @@
 pyelftools>=0.26
 
 # used by dts generation to parse binding YAMLs, also used by
-# twister to parse YAMLs
+# twister to parse YAMLs, by west, zephyr_module,...
 PyYAML>=5.1
 
+# YAML validation. Used by zephyr_module.
+pykwalify
+
 # used by west_commands
 canopen
 packaging
diff --git a/scripts/requirements-build-test.txt b/scripts/requirements-build-test.txt
index f3f3066a251..79309a179cd 100644
--- a/scripts/requirements-build-test.txt
+++ b/scripts/requirements-build-test.txt
@@ -9,9 +9,6 @@ colorama
 # python lex/yex used by twister
 ply>=3.10
 
-# optional, but used for validation of YAML
-pykwalify
-
 # used for code coverage
 gcovr>=4.2
 coverage