diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9ab5f1e..3d4e536 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,7 +19,7 @@ jobs:
       - name: Install dependencies
         run: |
           pip install -U pip
-          pip install -r requirements.txt
+          pip install -e ".[dev]"
       - name: Lint and check formatting
         run: |
           ruff check .
diff --git a/README.md b/README.md
index 46026fb..20d4fef 100644
--- a/README.md
+++ b/README.md
@@ -99,7 +99,7 @@ source .venv/bin/activate  # for Windows OS, .\.venv\Scripts\Activate instead sh
 #### Install dependencies
 
 ```sh
-pip install -r requirements.txt
+pip install -e ".[dev]"
 ```
 
 </details>
diff --git a/pyproject.toml b/pyproject.toml
index 90244b5..6915bd6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,6 +6,7 @@ dependencies = [
     "slack-sdk==3.45.0",
     "slack-bolt==1.30.0",
     "slack-cli-hooks<1.0.0",
+    # If you use a different LLM vendor, replace this dependency
     "openai==3.29.0",
     "python-dotenv==1.2.4",
 ]
diff --git a/requirements.txt b/requirements.txt
deleted file mode 100644
index 60dce27..0000000
--- a/requirements.txt
+++ /dev/null
@@ -1,11 +0,0 @@
-slack-sdk==3.45.0
-slack-bolt==1.30.0
-slack-cli-hooks<1.0.0
-
-# If you use a different LLM vendor, replace this dependency
-openai==3.29.0
-
-pytest==9.1.1
-ruff==0.17.0
-python-dotenv==1.2.4
-slack-cli-hooks<1.0.0