diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 19c4376..98e7db0 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -40,26 +40,26 @@ jobs:
         python -m pytest test --cov=samila --cov-report=term
       env:
         NFT_STORAGE_API_KEY: ${{ secrets.NFT_STORAGE_API_KEY }}
-      if: matrix.python-version == 3.7 && matrix.os == 'ubuntu-latest'
+      if: matrix.python-version == 3.8 && matrix.os == 'ubuntu-latest'
     - name: Version check
       run: |
         python otherfiles/version_check.py
-      if: matrix.python-version == 3.7
+      if: matrix.python-version == 3.8
     - name: Other tests
       run: |
         python -m vulture samila/ setup.py --min-confidence 65 --exclude=__init__.py --sort-by-size
         python -m bandit -r samila -s B311,B307
         python -m pydocstyle -v --match-dir=samila
-      if: matrix.python-version == 3.7
+      if: matrix.python-version == 3.8
     - name: Notebook check
       run: |
         pip install notebook>=5.2.2
         python otherfiles/notebook_check.py
-      if: matrix.python-version == 3.7 && matrix.os == 'ubuntu-latest'
+      if: matrix.python-version == 3.8 && matrix.os == 'ubuntu-latest'
     - name: Codecov
       run: |
         codecov
-      if: matrix.python-version == 3.7 && matrix.os == 'ubuntu-latest'
+      if: matrix.python-version == 3.8 && matrix.os == 'ubuntu-latest'
     - name: cProfile
       run: |
           python -m cProfile -s cumtime otherfiles/samila_profile.py
diff --git a/CHANGELOG.md b/CHANGELOG.md
index eeb16a8..150142c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Changed
+- Test system modified
 ## [0.9] - 2022-09-28
 ### Added
 - Anaconda workflow