diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 8880e83d44..bfc20f767a 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -17,7 +17,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-18.04]
-        ruby: [ 2.7  ]
+        ruby: [ 2.6, 2.7  ]
     runs-on: ${{ matrix.os }}
     continue-on-error: ${{ endsWith(matrix.ruby, 'head') || matrix.ruby == 'debug' }}
     steps:
@@ -100,6 +100,11 @@ jobs:
       - name: Give test coverage reporter executable permissions
         run: chmod +x cc-test-reporter
 
+      - uses: actions/download-artifact@v1
+        with:
+          name: coverage-2.6
+          path: coverage
+
       - uses: actions/download-artifact@v1
         with:
           name: coverage-2.7
diff --git a/.ruby-version b/.ruby-version
index 37c2961c24..338a5b5d8f 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.7.2
+2.6.6
diff --git a/Dockerfile b/Dockerfile
index 97b0452e1d..5d241eeef4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM internetee/ruby:2.7-buster
+FROM internetee/ruby:2.6-buster
 
 RUN mkdir -p /opt/webapps/app/tmp/pids
 WORKDIR /opt/webapps/app