diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 1ce7c8d..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,37 +0,0 @@
-language: python
-os: linux
-dist: xenial
-
-env:
-  global:
-    PIP_PREFER_BINARY=true
-
-python:
-  - "3.5"
-  - "3.6"
-  - "3.7"
-  - "3.8"
-  - "3.9"
-  - "3.10"
-  - "3.11"
-
-install:
-  - pip install --upgrade pip
-  - pip install -r requirements_ci.txt
-  - pip install pytest
-  - pip install pytest-cov
-  - pip install coveralls
-
-# command to run tests
-script:
-   pytest --cov=pyod/
-
-after_success:
-  - coveralls
-
-notifications:
-  email:
-    recipients:
-      - kq441morita@gmail.com
-  on_success: never # default: change
-  on_failure: always # default: always
diff --git a/circleci.yml b/circleci.yml
deleted file mode 100644
index 933332e..0000000
--- a/circleci.yml
+++ /dev/null
@@ -1,31 +0,0 @@
-version: 2.1
-
-orbs:
-  node: circleci/node@1.1.6
-
-jobs:
-  test:
-    executor:
-      name: node/default
-
-    steps:
-      - checkout
-
-      - node/with-cache:
-          steps:
-            - run: npm install
-            - run: make test-coverage
-
-      # More compact variant without hashsum check
-      # - run: curl -sL https://coveralls.io/coveralls-linux.tar.gz | tar -xz && ./coveralls
-      - run: |
-          curl -sLO https://github.com/coverallsapp/coverage-reporter/releases/latest/download/coveralls-linux.tar.gz
-          curl -sLO https://github.com/coverallsapp/coverage-reporter/releases/latest/download/coveralls-checksums.txt
-          cat coveralls-checksums.txt | grep coveralls-linux.tar.gz | sha256sum --check
-          tar -xzf coveralls-linux.tar.gz
-          ./coveralls
-
-workflows:
-  test:
-    jobs:
-      - test