diff --git a/.claude/CLAUDE.md b/.claude/CLAUDE.md
index a0014a6..df589c5 100644
--- a/.claude/CLAUDE.md
+++ b/.claude/CLAUDE.md
@@ -38,7 +38,7 @@ openai-agents-sdk/   # OpenAI Agents SDK implementation
 pydantic-ai/         # Pydantic AI implementation
 ```
 
-CI runs ruff lint/format checks against all directories via a matrix strategy in `.github/workflows/ruff.yml`. Dependabot monitors `requirements.txt` in all directories independently.
+CI runs ruff lint/format checks against all directories via a matrix strategy in `.github/workflows/ruff.yml`. Dependabot monitors `pyproject.toml` in all directories independently.
 
 ## Architecture (shared across all implementations)
 
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 17e9b6a..babd9cc 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -28,7 +28,7 @@ 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 .
@@ -54,7 +54,6 @@ jobs:
       - name: Install dependencies
         run: |
           pip install -U pip
-          pip install -r requirements.txt
           pip install ".[test]"
       - name: Run all tests
         run: |
diff --git a/claude-agent-sdk/README.md b/claude-agent-sdk/README.md
index 884c4de..1dd24aa 100644
--- a/claude-agent-sdk/README.md
+++ b/claude-agent-sdk/README.md
@@ -95,7 +95,7 @@ source .venv/bin/activate  # for Windows OS, .\.venv\Scripts\Activate instead sh
 #### Install dependencies
 
 ```sh
-pip install -r requirements.txt
+pip install -e ".[dev]"
 ```
 
 ## Providers
diff --git a/claude-agent-sdk/pyproject.toml b/claude-agent-sdk/pyproject.toml
index d9b77e5..fa5d90c 100644
--- a/claude-agent-sdk/pyproject.toml
+++ b/claude-agent-sdk/pyproject.toml
@@ -7,7 +7,7 @@ dependencies = [
     "slack-bolt==1.30.0",
     "slack-cli-hooks==0.3.0",
     "claude-agent-sdk==0.2.165",
-    "aiohttp==3.14.3",
+    "aiohttp==3.14.5",
     "python-dotenv==1.2.4",
 ]
 
diff --git a/claude-agent-sdk/requirements.txt b/claude-agent-sdk/requirements.txt
deleted file mode 100644
index ff52632..0000000
--- a/claude-agent-sdk/requirements.txt
+++ /dev/null
@@ -1,10 +0,0 @@
-slack-sdk==3.45.0
-slack-bolt==1.30.0
-slack-cli-hooks==0.3.0
-claude-agent-sdk==0.2.165
-aiohttp==3.14.5
-python-dotenv==1.2.4
-
-pytest==9.1.1
-pytest-asyncio==1.4.0
-ruff==0.17.0
diff --git a/openai-agents-sdk/README.md b/openai-agents-sdk/README.md
index c94d7a6..2aa7013 100644
--- a/openai-agents-sdk/README.md
+++ b/openai-agents-sdk/README.md
@@ -95,7 +95,7 @@ source .venv/bin/activate  # for Windows OS, .\.venv\Scripts\Activate instead sh
 #### Install dependencies
 
 ```sh
-pip install -r requirements.txt
+pip install -e ".[dev]"
 ```
 
 ## Providers
diff --git a/openai-agents-sdk/requirements.txt b/openai-agents-sdk/requirements.txt
deleted file mode 100644
index 4bf5da4..0000000
--- a/openai-agents-sdk/requirements.txt
+++ /dev/null
@@ -1,8 +0,0 @@
-slack-sdk==3.45.0
-slack-bolt==1.30.0
-slack-cli-hooks==0.3.0
-openai-agents==0.23.1
-python-dotenv==1.2.4
-
-pytest==9.1.1
-ruff==0.17.0
diff --git a/pydantic-ai/README.md b/pydantic-ai/README.md
index de3a540..720aaad 100644
--- a/pydantic-ai/README.md
+++ b/pydantic-ai/README.md
@@ -95,7 +95,7 @@ source .venv/bin/activate  # for Windows OS, .\.venv\Scripts\Activate instead sh
 #### Install dependencies
 
 ```sh
-pip install -r requirements.txt
+pip install -e ".[dev]"
 ```
 
 ## Providers
diff --git a/pydantic-ai/pyproject.toml b/pydantic-ai/pyproject.toml
index c5ac0c7..289e1e8 100644
--- a/pydantic-ai/pyproject.toml
+++ b/pydantic-ai/pyproject.toml
@@ -6,7 +6,7 @@ dependencies = [
     "slack-sdk==3.45.0",
     "slack-bolt==1.30.0",
     "slack-cli-hooks==0.3.0",
-    "pydantic-ai[openai]==2.54.0",
+    "pydantic-ai[openai,anthropic]==2.55.0",
     "python-dotenv==1.2.4",
 ]
 
diff --git a/pydantic-ai/requirements.txt b/pydantic-ai/requirements.txt
deleted file mode 100644
index 72cd8a8..0000000
--- a/pydantic-ai/requirements.txt
+++ /dev/null
@@ -1,8 +0,0 @@
-slack-sdk==3.45.0
-slack-bolt==1.30.0
-slack-cli-hooks==0.3.0
-pydantic-ai[openai,anthropic]==2.55.0
-python-dotenv==1.2.4
-
-pytest==9.1.1
-ruff==0.17.0