diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 6549ce3..d5bbaa5 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -31,7 +31,7 @@ jobs:
         with:
           python-version: ${{ env.PYTHON_VERSION }}
       - name: Install dependencies
-        run: pip install -r requirements.txt
+        run: pip install .
       - name: Install check dependencies
         run: pip install black mypy pandas-stubs
       - name: black
@@ -47,8 +47,6 @@ jobs:
       - uses: actions/setup-python@v5
         with:
           python-version: ${{ env.PYTHON_VERSION }}
-      - name: Install dependencies
-        run: pip install -r requirements.txt && pip install pytest
       - name: Build wheel
         uses: PyO3/maturin-action@v1
         with:
@@ -57,6 +55,8 @@ jobs:
           sccache: "true"
       - name: Install wheel
         run: pip install dist/*.whl
+      - name: Install test dependencies
+        run: pip install pytest
       - name: Run tests
         run: pytest
 
@@ -80,9 +80,6 @@ jobs:
         with:
           python-version: ${{ env.PYTHON_VERSION }}
 
-      - name: Install requirements
-        run: pip install -r requirements.txt
-
       - name: Set Rust target for aarch64
         if: matrix.architecture == 'aarch64'
         id: target
diff --git a/README.md b/README.md
index 8dce2d2..d05ece7 100644
--- a/README.md
+++ b/README.md
@@ -4,13 +4,9 @@
 
 ## Installation
 
-`carefree-pyo3` has some prerequisites, the easiest way to install them is to use `requirements.txt`:
-
-```bash
-pip install -r requirements.txt
-```
-
-After that, simply install `carefree-pyo3` with `pip`:
+`carefree-pyo3` requires:
+- Python 3.8 or higher.
+- `numpy < 2.x`, because currently rust numpy doesn't support numpy 2.x.
 
 ```bash
 pip install carefree-pyo3
diff --git a/pyproject.toml b/pyproject.toml
index 3060a18..eec3ead 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,11 +5,17 @@ build-backend = "maturin"
 [project]
 name = "carefree-pyo3"
 requires-python = ">=3.8"
+dependencies = [
+  "numpy==1.24.4",
+  "pandas",
+  "pydantic",
+]
 classifiers = [
     "Programming Language :: Rust",
     "Programming Language :: Python :: Implementation :: CPython",
     "Programming Language :: Python :: Implementation :: PyPy",
 ]
 dynamic = ["version"]
+
 [tool.maturin]
 features = ["pyo3/extension-module"]
diff --git a/requirements.txt b/requirements.txt
deleted file mode 100644
index 9ffe0e0..0000000
--- a/requirements.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-numpy==1.24.4
-pandas
-pydantic