diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index febdfe2..39cce68 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -24,7 +24,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install flake8 black pytest
+        pip install -r time_based_storage/requirements-dev.txt
         cd time_based_storage && pip install -e .
     
     - name: Check code formatting with black
@@ -38,6 +38,19 @@ jobs:
         flake8 time_based_storage/src --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
         flake8 time_based_storage/tests --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
     
-    - name: Run tests
+    - name: Run tests with coverage
       run: |
-        cd time_based_storage && python -m pytest tests/ -v 
\ No newline at end of file
+        cd time_based_storage && python -m pytest tests/ -v --cov=src/time_based_storage --cov-report=xml
+
+    - name: Upload coverage reports to Codecov
+      uses: codecov/codecov-action@v5
+      with:
+        token: ${{ secrets.CODECOV_TOKEN }}
+        slug: johnburbridge/python-time-based-experiment
+          
+    - name: Upload test results to Codecov
+      if: ${{ !cancelled() }}
+      uses: codecov/test-results-action@v1
+      with:
+        token: ${{ secrets.CODECOV_TOKEN }}
+ 
diff --git a/README.md b/README.md
index 75e7d4b..d35eb61 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
 # Time-Based Storage System
 
 [![CI](https://github.com/johnburbridge/python-time-based-experiment/actions/workflows/ci.yml/badge.svg)](https://github.com/johnburbridge/python-time-based-experiment/actions/workflows/ci.yml)
+[![codecov](https://codecov.io/gh/johnburbridge/python-time-based-experiment/branch/main/graph/badge.svg)](https://codecov.io/gh/johnburbridge/python-time-based-experiment)
 
 A Python package providing two implementations of a time-based storage system for managing events with timestamps. This library is useful for applications that need to efficiently store and query time-based data, such as event logs, time series data, monitoring systems, and schedulers.
 
@@ -180,6 +181,15 @@ cd time_based_storage
 python -m pytest tests/ -v
 ```
 
+Run tests with code coverage:
+
+```bash
+cd time_based_storage
+python -m pytest tests/ -v --cov=src/time_based_storage --cov-report=html
+```
+
+This will generate an HTML coverage report in the `htmlcov` directory.
+
 ## Development
 
 ### Setup Development Environment
@@ -190,7 +200,7 @@ cd python-time-based-experiment
 python -m venv venv
 source venv/bin/activate  # On Windows: venv\Scripts\activate
 pip install -e time_based_storage/
-pip install pytest black flake8
+pip install -r time_based_storage/requirements-dev.txt
 ```
 
 ### Code Style
diff --git a/codecov.yml b/codecov.yml
new file mode 100644
index 0000000..734ef55
--- /dev/null
+++ b/codecov.yml
@@ -0,0 +1,29 @@
+codecov:
+  require_ci_to_pass: true
+
+coverage:
+  precision: 2
+  round: down
+  range: "70...100"
+  status:
+    project:
+      default:
+        target: 80%
+        threshold: 2%
+    patch:
+      default:
+        target: 80%
+        threshold: 2%
+
+parsers:
+  gcov:
+    branch_detection:
+      conditional: true
+      loop: true
+      method: false
+      macro: false
+
+comment:
+  layout: "reach,diff,flags,files,footer"
+  behavior: default
+  require_changes: false
diff --git a/time_based_storage/pyproject.toml b/time_based_storage/pyproject.toml
index 9b9309c..686cde7 100644
--- a/time_based_storage/pyproject.toml
+++ b/time_based_storage/pyproject.toml
@@ -27,4 +27,18 @@ extend-exclude = '''
 [tool.pytest.ini_options]
 testpaths = ["tests"]
 python_files = ["test_*.py"]
-addopts = "-v" 
\ No newline at end of file
+addopts = "-v"
+
+[tool.coverage.run]
+source = ["src/time_based_storage"]
+omit = ["tests/*"]
+
+[tool.coverage.report]
+exclude_lines = [
+    "pragma: no cover",
+    "def __repr__",
+    "raise NotImplementedError",
+    "if __name__ == .__main__.:",
+    "pass",
+    "raise ImportError",
+] 
\ No newline at end of file
diff --git a/time_based_storage/requirements-dev.txt b/time_based_storage/requirements-dev.txt
new file mode 100644
index 0000000..955a846
--- /dev/null
+++ b/time_based_storage/requirements-dev.txt
@@ -0,0 +1,5 @@
+pytest>=7.0.0
+black>=23.0.0
+flake8>=6.0.0
+pytest-cov>=4.0.0
+codecov>=2.1.12 
\ No newline at end of file