diff --git a/dao/CHANGELOG.md b/dao/CHANGELOG.md
index 37aecbfe..e5cf2314 100644
--- a/dao/CHANGELOG.md
+++ b/dao/CHANGELOG.md
@@ -1,6 +1,12 @@
 # Changelog 刀 DAO
 # Day Ahead Optimizer
-# 2026.02.0
+# 2026.02.1
+Added missing module tzdata
+
+### Breaking change
+The file-format ofthe calculated model is changed (update of module pandas).
+The ml_prediction works only after a new training of the models.<br>
+### Changes:
 - Update several python modules
 - Fix error api predict pv_dc (reported by @Dogooder)
 - Adjustments in documentation (#521, @storeman)
diff --git a/dao/config.yaml b/dao/config.yaml
index e1f64cfe..730efe70 100644
--- a/dao/config.yaml
+++ b/dao/config.yaml
@@ -1,6 +1,6 @@
 ---
 name: 刀 Day Ahead Optimizer
-version: 2026.02.0
+version: 2026.02.1
 slug: day_ahead_opt
 description: Home Assistant Community Add-ons for day ahead optimizations
 url: https://github.com/corneel27/day-ahead
diff --git a/dao/prog/da_prices.py b/dao/prog/da_prices.py
index 85cdb13c..d60dd0d9 100644
--- a/dao/prog/da_prices.py
+++ b/dao/prog/da_prices.py
@@ -7,6 +7,7 @@
 from requests import get, post
 from nordpool.elspot import Prices
 import pytz
+import tzdata
 import json
 import math
 import pprint as pp
diff --git a/dao/requirements.txt b/dao/requirements.txt
index 8659d6eb..2b8063e5 100644
--- a/dao/requirements.txt
+++ b/dao/requirements.txt
@@ -27,4 +27,5 @@ xgboost~=3.1.3
 scipy~=1.17.0
 joblib~=1.5.3
 knmi-py~=0.2.0
-asteval~=1.0.8
\ No newline at end of file
+asteval~=1.0.8
+tzdata~=2025.3
\ No newline at end of file
diff --git a/release-testing/CHANGELOG.md b/release-testing/CHANGELOG.md
index 331166af..fa5f2ae5 100644
--- a/release-testing/CHANGELOG.md
+++ b/release-testing/CHANGELOG.md
@@ -1,6 +1,13 @@
 # Changelog 刀 DAO
 # Day Ahead Optimizer
+# 2026.02.1.rc1
+Add missing module tzdata
+
 # 2026.02.0.rc2
+### Breaking change
+The file-format ofthe calculated model is changed (update of module pandas).
+The ml_prediction works only after a new training of the models.<br>
+### Changes:
 Update several python modules
 
 # 2026.02.0.rc1
diff --git a/release-testing/config.yaml b/release-testing/config.yaml
index 4fb6a58d..ce8a0290 100644
--- a/release-testing/config.yaml
+++ b/release-testing/config.yaml
@@ -1,6 +1,6 @@
 ---
 name: 刀 Day Ahead Optimizer (TESTING)
-version: 2026.02.0.rc2
+version: 2026.02.1.rc1
 stage: experimental
 slug: day_ahead_opt-testing
 description: Beta version of DAO. Use only for testing!