diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e3f81eb6..cdba7a8a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -197,7 +197,7 @@ jobs:
           for wasm in *.wasm; do
             name="${wasm%.wasm}"
             echo "[$name]"
-            if ! wasmer run "$wasm" --mapdir=./:.  2>&1; then
+            if ! wasmer run "$wasm" --volume=./:.  2>&1; then
               echo "*** [$name] FAILED" >&2
               failed=1
             fi
diff --git a/test/default/wasi-test-wrapper.sh b/test/default/wasi-test-wrapper.sh
index 20ea7031..028f2789 100755
--- a/test/default/wasi-test-wrapper.sh
+++ b/test/default/wasi-test-wrapper.sh
@@ -19,7 +19,7 @@ fi
 
 if [ -z "$WASI_RUNTIME" ] || [ "$WASI_RUNTIME" = "wasmer" ]; then
   if command -v wasmer >/dev/null; then
-    wasmer run "$1" "--${WASMER_BACKEND:-cranelift}" --mapdir=./:. && exit 0
+    wasmer run "$1" "--${WASMER_BACKEND:-cranelift}" --volume=./:. && exit 0
   fi
 fi