diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 6c61520..c073b54 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -1,48 +1,3 @@
-# name: CI
-# on:
-#   push:
-#     branches:
-#       - main
-#     tags: ['*']
-#   pull_request:
-#   workflow_dispatch:
-# concurrency:
-#   # Skip intermediate builds: always.
-#   # Cancel intermediate builds: only if it is a pull request build.
-#   group: ${{ github.workflow }}-${{ github.ref }}
-#   cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
-# jobs:
-#   test:
-#     name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
-#     runs-on: ${{ matrix.os }}
-#     strategy:
-#       fail-fast: false
-#       matrix:
-#         version:
-#           - '1.6'
-#           - '1.9'
-#           - 'nightly'
-#         os:
-#           - ubuntu-latest
-#         arch:
-#           - x64
-#     steps:
-#       - uses: actions/checkout@v4
-#       - uses: julia-actions/setup-julia@v1
-#         with:
-#           version: ${{ matrix.version }}
-#           arch: ${{ matrix.arch }}
-#       - uses: julia-actions/cache@v1
-#       - uses: julia-actions/julia-buildpkg@v1
-#       - uses: julia-actions/julia-runtest@v1
-#       - uses: julia-actions/julia-processcoverage@v1
-#       - uses: codecov/codecov-action@v3
-#         with:
-#           files: lcov.info
-#       - uses: julia-actions/julia-uploadcoveralls@v1
-#         env:
-#           COVERALLS_TOKEN: ${{ secrets.COVERALLS_TOKEN }}
-
 name: CI
 on:
   push:
@@ -59,7 +14,7 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.9'
+          - '1.6'
           - '1.9'
           - 'nightly'
         os:
@@ -67,7 +22,7 @@ jobs:
         arch:
           - x64          
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v2
       - uses: julia-actions/setup-julia@v1
         with:
           version: ${{ matrix.version }}
@@ -87,4 +42,4 @@ jobs:
       - uses: julia-actions/julia-processcoverage@v1
       - uses: codecov/codecov-action@v3
         with:
-          file: lcov.info
\ No newline at end of file
+          file: lcov.info