diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f69e0df5..b7680934 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -180,36 +180,36 @@ jobs:
             TOYWASM_ENABLE_WASI_THREADS: OFF
             TOYWASM_ENABLE_WASM_EXCEPTION_HANDLING: OFF
             TOYWASM_ENABLE_WASM_CUSTOM_PAGE_SIZES: OFF
-          - name: ubuntu-20.04-armhf
-            os: ubuntu-20.04
-            compiler: clang
-            arch: armhf
-            BUILD_TYPE: Release
-            TOYWASM_USE_SEPARATE_EXECUTE: ON
-            TOYWASM_USE_TAILCALL: ON
-            TOYWASM_ENABLE_TRACING: OFF
-            TOYWASM_USE_SMALL_CELLS: ON
-            TOYWASM_USE_SEPARATE_LOCALS: ON
-            MISC_FEATURES: OFF
-            TOYWASM_ENABLE_WASM_THREADS: OFF
-            TOYWASM_ENABLE_WASI_THREADS: OFF
-            TOYWASM_ENABLE_WASM_EXCEPTION_HANDLING: OFF
-            TOYWASM_ENABLE_WASM_CUSTOM_PAGE_SIZES: OFF
-          - name: ubuntu-20.04-s390x
-            os: ubuntu-20.04
-            compiler: clang
-            arch: s390x
-            BUILD_TYPE: Release
-            TOYWASM_USE_SEPARATE_EXECUTE: ON
-            TOYWASM_USE_TAILCALL: ON
-            TOYWASM_ENABLE_TRACING: OFF
-            TOYWASM_USE_SMALL_CELLS: ON
-            TOYWASM_USE_SEPARATE_LOCALS: ON
-            MISC_FEATURES: OFF
-            TOYWASM_ENABLE_WASM_THREADS: OFF
-            TOYWASM_ENABLE_WASI_THREADS: OFF
-            TOYWASM_ENABLE_WASM_EXCEPTION_HANDLING: OFF
-            TOYWASM_ENABLE_WASM_CUSTOM_PAGE_SIZES: OFF
+          #- name: ubuntu-20.04-armhf
+          #  os: ubuntu-20.04
+          #  compiler: clang
+          #  arch: armhf
+          #  BUILD_TYPE: Release
+          #  TOYWASM_USE_SEPARATE_EXECUTE: ON
+          #  TOYWASM_USE_TAILCALL: ON
+          #  TOYWASM_ENABLE_TRACING: OFF
+          #  TOYWASM_USE_SMALL_CELLS: ON
+          #  TOYWASM_USE_SEPARATE_LOCALS: ON
+          #  MISC_FEATURES: OFF
+          #  TOYWASM_ENABLE_WASM_THREADS: OFF
+          #  TOYWASM_ENABLE_WASI_THREADS: OFF
+          #  TOYWASM_ENABLE_WASM_EXCEPTION_HANDLING: OFF
+          #  TOYWASM_ENABLE_WASM_CUSTOM_PAGE_SIZES: OFF
+          #- name: ubuntu-20.04-s390x
+          #  os: ubuntu-20.04
+          #  compiler: clang
+          #  arch: s390x
+          #  BUILD_TYPE: Release
+          #  TOYWASM_USE_SEPARATE_EXECUTE: ON
+          #  TOYWASM_USE_TAILCALL: ON
+          #  TOYWASM_ENABLE_TRACING: OFF
+          #  TOYWASM_USE_SMALL_CELLS: ON
+          #  TOYWASM_USE_SEPARATE_LOCALS: ON
+          #  MISC_FEATURES: OFF
+          #  TOYWASM_ENABLE_WASM_THREADS: OFF
+          #  TOYWASM_ENABLE_WASI_THREADS: OFF
+          #  TOYWASM_ENABLE_WASM_EXCEPTION_HANDLING: OFF
+          #  TOYWASM_ENABLE_WASM_CUSTOM_PAGE_SIZES: OFF
           - name: ubuntu-20.04-riscv64
             os: ubuntu-20.04
             compiler: clang
@@ -272,22 +272,22 @@ jobs:
             TOYWASM_ENABLE_WASI_THREADS: ON
             TOYWASM_ENABLE_WASI_LITTLEFS: ON
             TOYWASM_ENABLE_WASM_EXCEPTION_HANDLING: ON
-          - name: full-ubuntu-20.04-s390x
-            os: ubuntu-20.04
-            compiler: clang
-            arch: s390x
-            BUILD_TYPE: Release
-            TOYWASM_USE_SEPARATE_EXECUTE: ON
-            TOYWASM_USE_TAILCALL: ON
-            TOYWASM_ENABLE_TRACING: OFF
-            TOYWASM_USE_SMALL_CELLS: ON
-            TOYWASM_USE_SEPARATE_LOCALS: ON
-            MISC_FEATURES: ON
-            TOYWASM_ENABLE_WASM_THREADS: ON
-            TOYWASM_ENABLE_WASI_THREADS: ON
-            TOYWASM_ENABLE_WASI_LITTLEFS: ON
-            TOYWASM_ENABLE_WASM_EXCEPTION_HANDLING: ON
-            TOYWASM_ENABLE_WASM_CUSTOM_PAGE_SIZES: ON
+          #- name: full-ubuntu-20.04-s390x
+          #  os: ubuntu-20.04
+          #  compiler: clang
+          #  arch: s390x
+          #  BUILD_TYPE: Release
+          #  TOYWASM_USE_SEPARATE_EXECUTE: ON
+          #  TOYWASM_USE_TAILCALL: ON
+          #  TOYWASM_ENABLE_TRACING: OFF
+          #  TOYWASM_USE_SMALL_CELLS: ON
+          #  TOYWASM_USE_SEPARATE_LOCALS: ON
+          #  MISC_FEATURES: ON
+          #  TOYWASM_ENABLE_WASM_THREADS: ON
+          #  TOYWASM_ENABLE_WASI_THREADS: ON
+          #  TOYWASM_ENABLE_WASI_LITTLEFS: ON
+          #  TOYWASM_ENABLE_WASM_EXCEPTION_HANDLING: ON
+          #  TOYWASM_ENABLE_WASM_CUSTOM_PAGE_SIZES: ON
           - name: full-ubuntu-20.04-riscv64
             os: ubuntu-20.04
             compiler: clang
@@ -413,12 +413,7 @@ jobs:
 
     - name: Install QEMU
       if: matrix.arch != 'native' && matrix.arch != 'i386'
-      # install newer qemu from
-      # https://launchpad.net/%7Ecanonical-server/+archive/ubuntu/server-backports/
-      # https://github.com/yamt/toywasm/pull/53#issuecomment-1605899935
       run: |
-        sudo apt-get update && sudo apt-get install -y software-properties-common
-        sudo add-apt-repository -y ppa:canonical-server/server-backports
         sudo apt-get update && sudo apt-get install -y qemu-user-static
 
     - name: toywasm --version
@@ -629,15 +624,15 @@ jobs:
         name: ubuntu-20.04-arm64
         path: release_assets
 
-    - uses: actions/download-artifact@v3
-      with:
-        name: ubuntu-20.04-armhf
-        path: release_assets
+    #- uses: actions/download-artifact@v3
+    #  with:
+    #    name: ubuntu-20.04-armhf
+    #    path: release_assets
 
-    - uses: actions/download-artifact@v3
-      with:
-        name: ubuntu-20.04-s390x
-        path: release_assets
+    #- uses: actions/download-artifact@v3
+    #  with:
+    #    name: ubuntu-20.04-s390x
+    #    path: release_assets
 
     - uses: actions/download-artifact@v3
       with:
@@ -659,10 +654,10 @@ jobs:
         name: full-ubuntu-20.04-armhf
         path: release_assets
 
-    - uses: actions/download-artifact@v3
-      with:
-        name: full-ubuntu-20.04-s390x
-        path: release_assets
+    #- uses: actions/download-artifact@v3
+    #  with:
+    #    name: full-ubuntu-20.04-s390x
+    #    path: release_assets
 
     - uses: actions/download-artifact@v3
       with: