diff --git a/.github/workflows/master.yml b/.github/workflows/master.yml
index 76e10ec..2c51296 100644
--- a/.github/workflows/master.yml
+++ b/.github/workflows/master.yml
@@ -21,6 +21,6 @@ jobs:
         env:
           DOCKER_USERNAME: 'boky'
           DOCKER_PASSWORD: '${{ secrets.DOCKER_ACCESS_TOKEN }}'
-          PLATFORMS: "linux/386,linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64,linux/ppc64le,linux/s390x"
+          PLATFORMS: "linux/386,linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64,linux/ppc64le"
         run: ./build.sh -t boky/postfix --push
 
diff --git a/.github/workflows/pull_request.yml b/.github/workflows/pull_request.yml
index 00f0743..49a4a94 100644
--- a/.github/workflows/pull_request.yml
+++ b/.github/workflows/pull_request.yml
@@ -17,6 +17,6 @@ jobs:
           version: latest
       - name: Run Buildx
         env:
-          PLATFORMS: "linux/386,linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64,linux/ppc64le,linux/s390x"
+          PLATFORMS: "linux/386,linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64,linux/ppc64le"
         run: ./build.sh -t boky/postfix
 
diff --git a/.github/workflows/tags.yml b/.github/workflows/tags.yml
index 00ae0b4..01b6161 100644
--- a/.github/workflows/tags.yml
+++ b/.github/workflows/tags.yml
@@ -19,6 +19,6 @@ jobs:
         env:
           DOCKER_USERNAME: 'boky'
           DOCKER_PASSWORD: '${{ secrets.DOCKER_ACCESS_TOKEN }}'
-          PLATFORMS: "linux/386,linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64,linux/ppc64le,linux/s390x"
+          PLATFORMS: "linux/386,linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64,linux/ppc64le"
         run: ./build.sh -t boky/postfix:$(echo ${GITHUB_REF:10}) --push