diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b053784c..8a3e3621 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -97,7 +97,7 @@ jobs:
         uv python install ${{ matrix.python-version }}
         uv venv --python ${{ matrix.python-version }} .venv
     - name: Change dependencies to minimal supported versions
-      run: sed -i -e 's/>=/==/g; s/~=.*==\(.*\)/==\1/g; s/~=/==/g;' pyproject.toml
+      run: sed -i -e '/requires-python/!s/>=/==/g; /requires-python/!s/~=.*==\(.*\)/==\1/g; /requires-python/!s/~=/==/g;' pyproject.toml
       if: matrix.dependencies == 'minimal'
     - name: Run tests
       run: |