diff --git a/.github/workflows/build-and-publish-to-pypi.yml b/.github/workflows/build-and-publish-to-pypi.yml
index d603404..b439f89 100644
--- a/.github/workflows/build-and-publish-to-pypi.yml
+++ b/.github/workflows/build-and-publish-to-pypi.yml
@@ -16,21 +16,22 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-20.04, macos-11]  #windows-2019
+        # skip building wheel for windows as it's not working yet
+        os: [ubuntu-latest, macos-13]  #windows-2019
 
     steps:
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
-      - name: Provide gfortran (macOS)
+      - name: Provide gfortran (macOS-13)
         if: runner.os == 'macOS'
         run: |
           # https://github.com/actions/virtual-environments/issues/2524
           # https://github.com/cbg-ethz/dce/blob/master/.github/workflows/pkgdown.yaml
-          sudo ln -s /usr/local/bin/gfortran-11 /usr/local/bin/gfortran
+          sudo ln -s /usr/local/bin/gfortran-13 /usr/local/bin/gfortran
           sudo mkdir /usr/local/gfortran
-          sudo ln -s /usr/local/Cellar/gcc@11/*/lib/gcc/11 /usr/local/gfortran/lib
+          sudo ln -s /usr/local/Cellar/gcc@13/*/lib/gcc/13 /usr/local/gfortran/lib
           gfortran --version
 
       - name: Provide gfortran (Windows)
diff --git a/pyproject.toml b/pyproject.toml
index 3353df7..ecad3f8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,7 +9,12 @@ authors = [
     {name="Zhang Yunjun", email="yunjunz@outlook.com"},
     {name="Dennis Milbert"},
 ]
+readme = "README.md"
 requires-python = ">=3.8"
+dependencies = [
+    "numpy",
+    "scipy",
+]
 
 keywords = ["solid Earth tides", "deformation", "geodesy", "geophysics"]
 license = {text = "GPL-3.0-or-later"}
@@ -25,7 +30,7 @@ classifiers = [
 # see section: setuptools_scm
 # https://setuptools.pypa.io/en/latest/userguide/pyproject_config.html#dynamic-metadata
 # dependencies will be read from text files
-dynamic = ["version", "readme", "dependencies", "optional-dependencies"]
+dynamic = ["version"]
 
 [project.urls]
 "Homepage" = "https://github.com/insarlab/PySolid"
@@ -35,17 +40,6 @@ dynamic = ["version", "readme", "dependencies", "optional-dependencies"]
 include-package-data = true
 zip-safe = false
 
-[tool.setuptools.dynamic]
-dependencies = { file = ["requirements.txt"] }
-readme = { file = "README.md", content-type = "text/markdown" }
-
-# extra requirements: `pip install pysolid[docs]` or `pip install .[docs,test]`
-# note: the [docs] syntax requires setuptools>=64.0, thus, not working yet.
-[tool.setuptools.dynamic.optional-dependencies.docs]
-file = ["docs/requirements.txt"]
-[tool.setuptools.dynamic.optional-dependencies.test]
-file = ["tests/requirements.txt"]
-
 [tool.setuptools.packages.find]
 where = ["src"]