diff --git a/docs/requirements.txt b/docs/requirements.txt
index 7ece00dc9f..d955d34bfb 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,7 +1,7 @@
 attrs==23.1.0
 catkin-pkg==0.5.2
 click==8.1.7
-craft-application==2.5.0
+craft-application==2.6.0
 craft-archives==1.1.3
 craft-cli==2.5.1
 craft-grammar==1.2.0
diff --git a/requirements-devel.txt b/requirements-devel.txt
index 5d1522d5f0..99af12eac4 100644
--- a/requirements-devel.txt
+++ b/requirements-devel.txt
@@ -11,7 +11,7 @@ click==8.1.7
 codespell==2.2.6
 colorama==0.4.6
 coverage==7.4.4
-craft-application==2.5.0
+craft-application==2.6.0
 craft-archives==1.1.3
 craft-cli==2.5.1
 craft-grammar==1.2.0
diff --git a/requirements.txt b/requirements.txt
index 7a3b3f675c..1025d55a82 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ cffi==1.16.0
 chardet==5.2.0
 charset-normalizer==3.3.2
 click==8.1.7
-craft-application==2.5.0
+craft-application==2.6.0
 craft-archives==1.1.3
 craft-cli==2.5.1
 craft-grammar==1.2.0
diff --git a/tests/spread/core24/grammar/snap/snapcraft.yaml b/tests/spread/core24/grammar/snap/snapcraft.yaml
index ef1407d36c..e0f04fe812 100644
--- a/tests/spread/core24/grammar/snap/snapcraft.yaml
+++ b/tests/spread/core24/grammar/snap/snapcraft.yaml
@@ -15,6 +15,12 @@ platforms:
     build-on: amd64
     build-for: arm64
 
+build-packages:
+  - on amd64 to amd64:
+    - libogg-dev
+  - on amd64 to arm64:
+    - libpci-dev
+
 parts:
   hello-world:
     plugin: dump
diff --git a/tests/unit/test_application.py b/tests/unit/test_application.py
index 9706ba1665..c289646277 100644
--- a/tests/unit/test_application.py
+++ b/tests/unit/test_application.py
@@ -161,9 +161,13 @@ def test_application_expand_extensions(emitter, monkeypatch, extension_source, n
 
 
 @pytest.mark.usefixtures("fake_extension")
-def test_application_build_with_extensions(monkeypatch, extension_source, new_dir):
-    """Test that extensions are correctly applied in regular builds."""
+def test_application_extra_yaml_transforms(
+    monkeypatch, extension_source, new_dir, emitter
+):
+    """Test that extra_yaml_transforms applies root keywords and expands extensions."""
     monkeypatch.setenv("CRAFT_DEBUG", "1")
+    extension_source["build-packages"] = [{"to s390x": "test-package"}]
+    extension_source["build-snaps"] = [{"to s390x": "test-snap"}]
 
     project_path = new_dir / "snap/snapcraft.yaml"
     (new_dir / "snap").mkdir()
@@ -172,12 +176,16 @@ def test_application_build_with_extensions(monkeypatch, extension_source, new_di
     # Calling a lifecycle command will create a Project. Creating a Project
     # without applying the extensions will fail because the "extensions" field
     # will still be present on the yaml data, so it's enough to run "pull".
-    monkeypatch.setattr("sys.argv", ["snapcraft", "pull", "--destructive-mode"])
+    monkeypatch.setattr(
+        "sys.argv", ["snapcraft", "pull", "--destructive-mode", "--build-for", "s390x"]
+    )
     app = application.create_app()
     app.run()
 
     project = app.get_project()
     assert "fake-extension/fake-part" in project.parts
+    assert project.parts["snapcraft/core"]["build-packages"] == ["test-package"]
+    assert project.parts["snapcraft/core"]["build-snaps"] == ["test-snap"]
 
 
 def test_application_managed_core20_fallback(monkeypatch, new_dir, mocker):