diff --git a/.github/workflows/ci-workflow.yml b/.github/workflows/ci-workflow.yml
index c8d55df9e4..412986b603 100644
--- a/.github/workflows/ci-workflow.yml
+++ b/.github/workflows/ci-workflow.yml
@@ -109,3 +109,26 @@ jobs:
       with:
         name: premake-${{ matrix.msystem }}-${{ matrix.platform }}
         path: bin\${{ matrix.config }}\
+  cosmopolitan:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        config: [debug, release]
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+    - uses: tritao/setup-cosmopolitan@v1.3
+      with:
+        version: '3.9.2'
+    - name: Build
+      run: make -f Bootstrap.mak cosmo CONFIG=${{ matrix.config }}
+    - name: Test
+      run: bin/${{ matrix.config }}/premake5 test --test-all
+    - name: Docs check
+      run: bin/${{ matrix.config }}/premake5 docs-check
+    - name: Upload Artifacts
+      if: matrix.config == 'release'
+      uses: actions/upload-artifact@v4
+      with:
+        name: premake-cosmopolitan-universal
+        path: bin/${{ matrix.config }}/premake5
diff --git a/Bootstrap.mak b/Bootstrap.mak
index 5934916ad5..479ed04f56 100644
--- a/Bootstrap.mak
+++ b/Bootstrap.mak
@@ -151,3 +151,12 @@ windows: windows-base
 
 windows-msbuild: windows-base
 	msbuild /p:Configuration=$(CONFIG) /p:Platform=$(PLATFORM:x86=win32) .\build\bootstrap\Premake5.sln
+
+cosmo-clean: nix-clean
+
+cosmo: cosmo-clean
+	mkdir -p build/bootstrap
+	cosmocc -o build/bootstrap/premake_bootstrap -DPREMAKE_NO_BUILTIN_SCRIPTS -DLUA_USE_POSIX -DLUA_USE_DLOPEN -I"$(LUA_DIR)" -I"$(LUASHIM_DIR)" $(SRC) -lm -ldl -lrt
+	./build/bootstrap/premake_bootstrap embed
+	./build/bootstrap/premake_bootstrap --to=build/bootstrap --cc=cosmocc gmake2
+	$(MAKE) -C build/bootstrap -j`getconf _NPROCESSORS_ONLN` config=$(CONFIG)