diff --git a/.github/workflows/github-actions.yml b/.github/workflows/github-actions.yml
new file mode 100644
index 0000000..6f18025
--- /dev/null
+++ b/.github/workflows/github-actions.yml
@@ -0,0 +1,25 @@
+name: Python package
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python 3.9
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.9
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt
+          pip install -r requirements_dev.txt
+      - name: Run precommit
+        run: |
+          pre-commit run --all-files
+      - name: Test with unittest
+        run: |
+          python -m unittest tests/*.py
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index bea15aa..9690c10 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -13,7 +13,7 @@ repos:
       language: system
       types: [python]
 -   repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v0.770
+    rev: v0.910
     hooks:
       - id: 'mypy'
         additional_dependencies:
diff --git a/mev_inspect/block.py b/mev_inspect/block.py
index 77ae962..821f031 100644
--- a/mev_inspect/block.py
+++ b/mev_inspect/block.py
@@ -1,5 +1,5 @@
 from pathlib import Path
-from typing import List
+from typing import Any, Dict, List
 
 from web3 import Web3
 
@@ -50,7 +50,7 @@ def fetch_block(w3, base_provider, block_number: int) -> Block:
     block_logs = w3.eth.get_logs({"blockHash": block_hash})
 
     ## Get gas used by individual txs and store them too
-    txs_gas_data = {}
+    txs_gas_data: Dict[str, Dict[str, Any]] = {}
 
     for transaction in block_data["transactions"]:
         tx_hash = (transaction.hash).hex()
diff --git a/requirements_dev.txt b/requirements_dev.txt
index e3f61f9..86600ba 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,2 +1,3 @@
 pre-commit==2.13.0
 pylint==2.9.3
+mypy==0.910