diff --git a/CHANGELOG.md b/CHANGELOG.md
index e7dedf1..9a70508 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+
+## [3.21.0] - 2026-01-19
+  - Add unratified Ziccid extension
+
 ## [3.20.0] - 2024-07-08
   - Add Sdtrig support
 
@@ -12,6 +16,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
   - allow yaml python pkg requirements to install newer versions #142
   - Fixing yaml parsing issue by replacing special characters in schema_isa.yaml.
 
+
 ## [3.18.3] - 2024-05-28
   - exclude Svnapot from march generation. fixes #178.
   - log raw error messages from ruamel while loading yamls. fixes #179.
diff --git a/riscv_config/__init__.py b/riscv_config/__init__.py
index bd72a28..435d919 100644
--- a/riscv_config/__init__.py
+++ b/riscv_config/__init__.py
@@ -1,3 +1,3 @@
 from pkgutil import extend_path
 __path__ = extend_path(__path__, __name__)
-__version__ = '3.20.0'
+__version__ = '3.21.0'
diff --git a/riscv_config/constants.py b/riscv_config/constants.py
index b2c7d9a..3a0c728 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",
+        "Ziccid"
 ] + Zve_extensions + Zvl_extensions
 
 S_extensions = ['Smrnmi','Smdbltrp', 'Ssdbltrp', 'Svnapot','Svadu', 'Sddbltrp', 'Sdext', 'Sdtrig']
diff --git a/setup.cfg b/setup.cfg
index eb3c6d8..fc890e0 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 3.20.0
+current_version = 3.21.0
 commit = True
 tag = True