diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index a40f32c2afaf..fbcaf016ccb0 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -17,7 +17,7 @@ jobs:
           cache-dependency-glob: uv.lock
       - uses: actions/setup-python@v7
         with:
-          python-version-file: pyproject.toml
+          python-version: 3.15
           allow-prereleases: true
       - run: uv sync --group=test
       - name: Run tests
diff --git a/.github/workflows/directory_writer.yml b/.github/workflows/directory_writer.yml
index 9df64222cd56..63996262f752 100644
--- a/.github/workflows/directory_writer.yml
+++ b/.github/workflows/directory_writer.yml
@@ -11,7 +11,7 @@ jobs:
           fetch-depth: 0
       - uses: actions/setup-python@v7
         with:
-          python-version-file: pyproject.toml
+          python-version: 3.15
           allow-prereleases: true
       - name: Write DIRECTORY.md
         run: |
diff --git a/.github/workflows/project_euler.yml b/.github/workflows/project_euler.yml
index 06f865f0bcdf..02518dcdef89 100644
--- a/.github/workflows/project_euler.yml
+++ b/.github/workflows/project_euler.yml
@@ -25,7 +25,7 @@ jobs:
       - uses: astral-sh/setup-uv@v7
       - uses: actions/setup-python@v7
         with:
-          python-version-file: pyproject.toml
+          python-version: 3.15
           allow-prereleases: true
       - run: uv sync --group=euler-validate --group=test
       - run: uv run pytest --doctest-modules --cov-report=term-missing:skip-covered --cov=project_euler/ project_euler/
@@ -43,7 +43,7 @@ jobs:
       - uses: astral-sh/setup-uv@v7
       - uses: actions/setup-python@v7
         with:
-          python-version-file: pyproject.toml
+          python-version: 3.15
           allow-prereleases: true
       - run: uv sync --group=euler-validate --group=test
       - run: uv run pytest scripts/validate_solutions.py
diff --git a/.github/workflows/sphinx.yml b/.github/workflows/sphinx.yml
index 3828bea0eaf0..9595b2ab2518 100644
--- a/.github/workflows/sphinx.yml
+++ b/.github/workflows/sphinx.yml
@@ -36,7 +36,7 @@ jobs:
       - uses: astral-sh/setup-uv@v7
       - uses: actions/setup-python@v7
         with:
-          python-version-file: pyproject.toml
+          python-version: 3.15
           allow-prereleases: true
       - run: uv sync --group=docs
       - uses: actions/configure-pages@v6
diff --git a/pyproject.toml b/pyproject.toml
index f6eb2e5e562f..e135d23c17ae 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,7 +24,7 @@ dependencies = [
   "qiskit>=2",
   "rich>=13.9.4",
   "scikit-learn>=1.5.2",
-  "scipy>=1.16.2",
+  "scipy>=1.18.1",
   "statsmodels>=0.14.4",
   "sympy>=1.13.3",
   "tweepy>=4.14",