diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 66edc8f..b1e904f 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -61,15 +61,6 @@ jobs:
       - name: Use old matplotlib for tests to enable moments pictures.
         run: |
           conda install "matplotlib<3.5"
-          
-      - name: Install SMAC (Linux, python3.8).
-        if: runner.os == 'Linux' && matrix.python-version == '3.8'
-        run: |
-          pip uninstall -y numpy
-          conda install numpy==1.20.0
-          pip install -r requirements/bayes_opt.txt
-          pip uninstall -y numpy
-          conda install numpy==1.20.0
 
       - name: Check installations of packages.
         run: |
diff --git a/requirements/bayes_opt.txt b/requirements/bayes_opt.txt
index d110616..b93bd57 100644
--- a/requirements/bayes_opt.txt
+++ b/requirements/bayes_opt.txt
@@ -1,5 +1,5 @@
 scikit-optimize
-configspace==0.7.1
+configspace
 Bayesmark
 scikit-learn<=1.1.2; python_version>='3.8'
 scipy<=1.6