diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 080b2a0f06..1693bf4494 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -10,7 +10,7 @@ defaults:
     shell: bash
     working-directory: src
 env:
-  CACHE_EPOCH: 1
+  CACHE_EPOCH: 2
   CCACHE_MAXSIZE: 200M
   CCACHE_MAXFILES: 0
   SCCACHE_CACHE_SIZE: 200M
@@ -443,6 +443,8 @@ jobs:
             openwrt: "target=at91 subtarget=sama7"
             target_cpu: arm
             extra: 'arm_version=0 arm_cpu="cortex-a7" arm_fpu="vfpv4" arm_float_abi="hard" arm_use_neon=false'
+            openwrt_release: '23.05.0'
+            openwrt_gcc_ver: '12.3.0'
           - arch: arm_cortex-a8_vfpv3
             openwrt: "target=sunxi subtarget=cortexa8"
             target_cpu: arm
@@ -486,9 +488,11 @@ jobs:
           - arch: riscv64
             openwrt: "target=sifiveu subtarget=generic"
             target_cpu: riscv64
+            openwrt_release: '23.05.0'
+            openwrt_gcc_ver: '12.3.0'
     env:
       EXTRA_FLAGS: target_cpu="${{ matrix.target_cpu }}" target_os="openwrt" ${{ matrix.extra }}
-      OPENWRT_FLAGS: arch=${{ matrix.arch }} release=23.05.0 gcc_ver=12.3.0 ${{ matrix.openwrt }}
+      OPENWRT_FLAGS: arch=${{ matrix.arch }} release=${{ matrix.openwrt_release || '21.02.0' }} gcc_ver=${{ matrix.openwrt_gcc_ver || '8.4.0' }} ${{ matrix.openwrt }}
       BUNDLE: naiveproxy-${{ github.event.release.tag_name }}-${{ github.job }}-${{ matrix.arch }}
     steps:
       - uses: actions/checkout@v4