diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 3bbcba0..3312ffa 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -2,7 +2,9 @@ name: CI
 
 on:
   push:
-  create:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
 
 env:
   CARGO_TERM_COLOR: always
@@ -24,7 +26,6 @@ jobs:
   # anyway so there's no point to run tests a third time.
   BuildLinux:
     runs-on: ubuntu-latest
-    if: "!(github.ref == 'refs/heads/main' && github.event_name == 'push')"
     steps:
     - uses: actions/checkout@v2
 
@@ -62,7 +63,6 @@ jobs:
 
   BuildWindows:
     runs-on: windows-latest
-    if: "!(github.ref == 'refs/heads/main' && github.event_name == 'push')"
     steps:
     - uses: actions/checkout@v2
 
@@ -92,7 +92,6 @@ jobs:
 
   BuildMacOS:
     runs-on: macos-latest
-    if: "!(github.ref == 'refs/heads/main' && github.event_name == 'push')"
     steps:
     - uses: actions/checkout@v2
 
@@ -113,43 +112,3 @@ jobs:
         name: wheels
         path: dist
         retention-days: 2
-
-  # This only runs when we push to main. Instead of running tests, we
-  # bump the version and make a tag.
-  BumpVersion:
-    runs-on: ubuntu-latest
-    if: github.ref == 'refs/heads/main' && github.event_name == 'push'
-    steps:
-      - uses: actions/checkout@v2
-        with:
-          fetch-depth: 0
-
-      # - run: git config user.name "GitHub actions"
-      # - run: git config user.email "github-actions@users.noreply.github.com"
-      # - run: python3 -m pip install --user python-semantic-release
-      # - run: python -m semantic_release version -v DEBUG -D commit_author="github-actions <action@github.com>"
-
-      - name: Python Semantic Release
-        uses: relekang/python-semantic-release@master
-        with:
-          github_token: ${{ secrets.GITHUB_TOKEN }}
-
-      - run: git push
-
-  # We've got a new version! `Build` will run and after it finishes we
-  # can publish!
-  Publish:
-    runs-on: ubuntu-latest
-    if: "startsWith(github.ref, 'refs/tags/')"
-    needs: [ BuildLinux, BuildWindows, BuildMacOS ]
-    steps:
-      - uses: actions/download-artifact@v2
-        with:
-          name: wheels
-      - name: Publish to PyPI
-        uses: messense/maturin-action@v1
-        env:
-          MATURIN_PYPI_TOKEN: ${{ secrets.PYPI_API_TOKEN }}
-        with:
-          command: upload
-          args: --repository-url=https://test.pypi.org/legacy/ --username=msalib --skip-existing *