diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 647f8e301..192ddaf37 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -33,5 +33,5 @@ jobs:
       uses: docker/build-push-action@v2
       with:
         file: Dockerfile
-        platforms: linux/amd64,linux/ppc64le,linux/s390x
+        platforms: linux/amd64,linux/ppc64le
         tags: quay.io/eclipse/che-operator:nightly
diff --git a/.github/workflows/nightly-image-build.yaml b/.github/workflows/nightly-image-build.yaml
index f672e262b..f51042de3 100644
--- a/.github/workflows/nightly-image-build.yaml
+++ b/.github/workflows/nightly-image-build.yaml
@@ -34,6 +34,6 @@ jobs:
       uses: docker/build-push-action@v2
       with:
         file: Dockerfile
-        platforms: linux/amd64,linux/ppc64le,linux/s390x
+        platforms: linux/amd64,linux/ppc64le
         push: true
         tags: quay.io/eclipse/che-operator:nightly
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 95ebc665c..0ea587277 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -12,7 +12,7 @@ on:
         default: ''
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-18.04
     steps:
       - uses: actions/checkout@v2
         with: