diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c589f40c..f818d7cb 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -229,21 +229,21 @@ jobs:
             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-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
@@ -306,22 +306,22 @@ 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
@@ -688,10 +688,10 @@ jobs:
         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:
@@ -713,10 +713,10 @@ 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: