diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 2d48b340..65052726 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -16,9 +16,9 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v2
       - name: Set up JDK 11
-        uses: actions/setup-java@v1
+        uses: coursier/setup-action@v1.1.2
         with:
-          java-version: 11
+          jvm: adopt:11
       - name: Cache sbt
         uses: coursier/cache-action@v6
         with:
@@ -36,13 +36,13 @@ jobs:
       JAVA_OPTS: -Xmx4G
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: coursier/setup-action@v1.1.2
         with:
           fetch-depth: 0 # checkout tags so that dynver works properly (we need the version for MiMa)
       - name: Set up JDK 11
         uses: actions/setup-java@v1
         with:
-          java-version: 11
+          jvm: adopt:11
       - name: Cache sbt
         uses: coursier/cache-action@v6
         with:
@@ -50,6 +50,35 @@ jobs:
       - name: Check MiMa # disable for major releases
         run: sbt -v core/mimaReportBinaryIssues
 
+  sourcegraph:
+    name: Upload index to sourcegraph
+    needs: [ci]
+    # run on external PRs, but not on internal PRs since those will be run by push to branch
+    if: github.event_name == 'push' || github.event.pull_request.head.repo.full_name != github.repository
+    runs-on: ubuntu-20.04
+    env:
+      JAVA_OPTS: -Xmx4G
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Set up JDK 11
+        uses: coursier/setup-action@v1.1.2
+        with:
+          jvm: adopt:11
+          apps: lsif-java
+      - name: Cache sbt
+        uses: coursier/cache-action@v6
+        with:
+          extraKey: sbt-cache-${{ runner.os }}
+      - name: Generate LSIF
+        run: lsif-java index
+      - name: Upload LSIF data
+        uses: sourcegraph/lsif-upload-action@master
+        with:
+          endpoint: https://sourcegraph.com
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          file: dump.lsif
+
   publish:
     name: Publish release
     needs: [ci]
@@ -61,9 +90,9 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v2
       - name: Set up JDK 11
-        uses: actions/setup-java@v1
+        uses: coursier/setup-action@v1.1.2
         with:
-          java-version: 11
+          jvm: adopt:11
       - name: Cache sbt
         uses: coursier/cache-action@v6
         with: