diff --git a/.circleci/config.yml b/.circleci/config.yml
index 5361a944..03943fa8 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -6,7 +6,7 @@ version: 2.1
 parameters:
     tools-cache-version:
         type: string
-        default: "v4"
+        default: "v5"
 
 # default execution env.s
 executors:
diff --git a/scripts/build-toolchains.sh b/scripts/build-toolchains.sh
index fa24214c..62a2f74b 100755
--- a/scripts/build-toolchains.sh
+++ b/scripts/build-toolchains.sh
@@ -131,7 +131,7 @@ SRCDIR="$(pwd)/toolchains" module_all libgloss --prefix="${RISCV}/riscv64-unknow
 SRCDIR="$(pwd)/toolchains" module_all qemu --prefix="${RISCV}" --target-list=riscv64-softmmu
 
 # make Dromajo
-git submodule --init $CHIPYARD_DIR/tools/dromajo/dromajo-src
+git submodule update --init $CHIPYARD_DIR/tools/dromajo/dromajo-src
 make -C $CHIPYARD_DIR/tools/dromajo/dromajo-src/src
 
 cd "$RDIR"