diff --git a/CHANGELOG.md b/CHANGELOG.md
index cbde9be..3fbe570 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,13 @@
 # Changelog
 
 This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+## [3.18.4] - 2025-12-21
+  - add unratified Zvzip extension
+
+## [3.18.3] - 2024-05-28
+  - exclude Svnapot from march generation. fixes #178.
+  - log raw error messages from ruamel while loading yamls. fixes #179.
+
 ## [3.18.2] - 2024-04-16
   - added yaml dump_flag which provides for the functions that dump yaml.
 
diff --git a/riscv_config/__init__.py b/riscv_config/__init__.py
index 4c64bcc..94e44d8 100644
--- a/riscv_config/__init__.py
+++ b/riscv_config/__init__.py
@@ -1,4 +1,4 @@
 from pkgutil import extend_path
 __path__ = extend_path(__path__, __name__)
-__version__ = '3.18.2'
+__version__ = '3.18.4'
 
diff --git a/riscv_config/constants.py b/riscv_config/constants.py
index 2913757..2c7b2f4 100644
--- a/riscv_config/constants.py
+++ b/riscv_config/constants.py
@@ -30,7 +30,8 @@
         "Ztso",
         "Zba", "Zbb", "Zbc", "Zbe", "Zbf", "Zbkb", "Zbkc", "Zbkx", "Zbm", "Zbp", "Zbpbo", "Zbr", "Zbs", "Zbt",
         "Zk", "Zkn", "Zknd", "Zkne", "Zknh", "Zkr", "Zks", "Zksed", "Zksh", "Zkt",
-        "Zpn", "Zpsf"
+        "Zpn", "Zpsf",
+        "Zvzip"
 ] + Zve_extensions + Zvl_extensions
 
 S_extensions = ['Smrnmi','Smdbltrp', 'Ssdbltrp', 'Svnapot','Svadu', 'Sddbltrp', 'Sdext']
diff --git a/setup.cfg b/setup.cfg
index a21fc70..e139e47 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 3.18.2
+current_version = 3.18.4
 commit = True
 tag = True