diff --git a/src/libcamera/control_ids.yaml b/src/libcamera/control_ids.yaml
index ecab3ae9..5510feef 100644
--- a/src/libcamera/control_ids.yaml
+++ b/src/libcamera/control_ids.yaml
@@ -2,7 +2,7 @@
 #
 # Copyright (C) 2019, Google Inc.
 #
-%YAML 1.2
+%YAML 1.1
 ---
 # Unless otherwise stated, all controls are bi-directional, i.e. they can be
 # set through Request::controls() and returned out through Request::metadata().
diff --git a/src/libcamera/formats.yaml b/src/libcamera/formats.yaml
index d3fbf5f4..e586cde1 100644
--- a/src/libcamera/formats.yaml
+++ b/src/libcamera/formats.yaml
@@ -2,7 +2,7 @@
 #
 # Copyright (C) 2020, Google Inc.
 #
-%YAML 1.2
+%YAML 1.1
 ---
 formats:
   - R8:
diff --git a/src/libcamera/property_ids.yaml b/src/libcamera/property_ids.yaml
index 11b7ebdc..cb55e0ed 100644
--- a/src/libcamera/property_ids.yaml
+++ b/src/libcamera/property_ids.yaml
@@ -2,7 +2,7 @@
 #
 # Copyright (C) 2019, Google Inc.
 #
-%YAML 1.2
+%YAML 1.1
 ---
 controls:
   - Location: