diff --git a/CHANGES.md b/CHANGES.md
index 3fa7ad4..47e78dd 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -14,8 +14,10 @@
 
 ### Changes
 
+* remove `pyaml` python dependency.
 
 ### Upgrade Notes
+
 ---
 
 ## 0.3 2024-07-01
diff --git a/cdl_utils/untyped_gen.py b/cdl_utils/untyped_gen.py
index a6107e5..5fbd623 100755
--- a/cdl_utils/untyped_gen.py
+++ b/cdl_utils/untyped_gen.py
@@ -14,7 +14,7 @@
 from collections import namedtuple, deque, defaultdict
 
 from elftools.elf.elffile import ELFFile
-from pyaml import yaml
+import yaml
 from sortedcontainers import SortedList
 
 from capdl import register_object_sizes