diff --git a/.github/workflows/ccpp.yml b/.github/workflows/ccpp.yml
index 67c854901..2814c2fe5 100644
--- a/.github/workflows/ccpp.yml
+++ b/.github/workflows/ccpp.yml
@@ -20,7 +20,7 @@ jobs:
       run: brew install ninja lua@5.1 luarocks
     - name: luarocks
       run: |
-        luarocks install --lua-version 5.1 luaposix 35.1-1
+        luarocks install --lua-version 5.1 luaposix 33.0.0-1
     - name: make
       run: make LUA=/usr/local/bin/lua5.1
 
@@ -45,7 +45,7 @@ jobs:
           zip
     - name: luarocks
       run: |
-        /mingw32/bin/luarocks --lua-version 5.1 install luaposix 35.1-1
+        /mingw32/bin/luarocks --lua-version 5.1 install luaposix 33.0.0-1
     - uses: actions/checkout@v3
     - name: build
       run: |