diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..93830d4
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,49 @@
+name: CI
+
+on:
+  push:
+    branches: [ main, master ]
+  pull_request:
+    branches: [ main, master ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -r dev-requirements.txt
+        pip install -e .
+
+    - name: Set PYTHONPATH
+      run: echo "PYTHONPATH=$(pwd):$PYTHONPATH" >> $GITHUB_ENV
+
+    - name: Run validation
+      run: |
+        if [ -z "$NOVALIDATE" ]; then
+          make validate
+        else
+          echo "skipping validate"
+        fi
+
+    - name: Run tests with coverage
+      run: pytest --cov ffx
+
+    - name: Upload coverage to Coveralls
+      if: matrix.python-version == '3.11'
+      uses: coverallsapp/github-action@v2
+      with:
+        github-token: ${{ secrets.GITHUB_TOKEN }}
+        coveralls-endpoint: https://coveralls.io
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 3626526..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,25 +0,0 @@
-language: python
-
-jobs:
-  include:
-    - python: "3.7"
-    - python: "3.8"
-    - python: "3.9"
-    - python: "3.10"
-    - python: "3.11"
-    - python: "3.12"
-    - python: "3.13"
-
-install:
-  - pip install -r dev-requirements.txt
-  - pip install -e .
-
-before_script:
-  - export PYTHONPATH=$(pwd):$PYTHONPATH;
-
-script:
-  - '[ -z "$NOVALIDATE" ] && make validate || echo "skipping validate"'
-  - pytest --cov ffx
-
-after_success:
-  - coveralls
diff --git a/README.md b/README.md
index e2b83b8..a50f036 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # FFX: Fast Function Extraction
 
-[![Build Status at Travis CI](https://travis-ci.org/natekupp/ffx.svg?branch=master)](https://travis-ci.org/natekupp/ffx)
+[![CI](https://github.com/natekupp/ffx/workflows/CI/badge.svg)](https://github.com/natekupp/ffx/actions?query=workflow%3ACI)
 [![Coverage Status](https://coveralls.io/repos/github/natekupp/ffx/badge.svg?branch=master)](https://coveralls.io/github/natekupp/ffx?branch=master)
 
 FFX is a technique for symbolic regression. It is:
diff --git a/ffx/time_utils.py b/ffx/time_utils.py
index cfb8db1..0e60ad9 100644
--- a/ffx/time_utils.py
+++ b/ffx/time_utils.py
@@ -1,21 +1,13 @@
-import os
 import signal
-import sys
 import time
 from contextlib import contextmanager
 from functools import wraps
-
-if sys.version_info.major >= 3 and sys.version_info.minor >= 3:
-    time_fn = time.perf_counter
-elif os.name == 'nt':
-    time_fn = time.clock
-else:
-    time_fn = time.time
+from builtins import TimeoutError
 
 
 class TimerResult:
     def __init__(self):
-        self.start_time = time_fn()
+        self.start_time = time.perf_counter()
         self.end_time = None
 
     @property
@@ -29,7 +21,7 @@ def millis(self):
 
 @contextmanager
 def time_execution_scope():
-    '''Usage:
+    """Usage:
 
     with time_execution_scope() as timer_result:
         do_some_operation()
@@ -39,18 +31,11 @@ def time_execution_scope():
             timer_result=timer_result
         )
     )
-    '''
+    """
 
     timer_result = TimerResult()
     yield timer_result
-    timer_result.end_time = time_fn()
-
-
-try:
-    from builtins import TimeoutError  # pylint: disable=unused-import
-except ImportError:
-    # TimeoutError was introduced in python 3.3+
-    TimeoutError = OSError
+    timer_result.end_time = time.perf_counter()
 
 
 def timeout(seconds_before_timeout):