diff --git a/.github/actions/prepare-gpu/action.yml b/.github/actions/prepare-gpu/action.yml
index 050e4657..e0527808 100644
--- a/.github/actions/prepare-gpu/action.yml
+++ b/.github/actions/prepare-gpu/action.yml
@@ -20,6 +20,8 @@ runs:
     - name: Init submodules to ensure stimuli is located
       run: |
         conda activate ${{ env.conda-env-name-no-time }}-$(date --date "${{ env.workflow-timestamp }}" +%Y%m%d)-${{ inputs.toolchain }}
+        eval `ssh-agent -s`
+        ssh-add - <<< '${{ secrets.PRIVATE_SSH_KEY }}'
         ./scripts/init-submodules-no-riscv-tools.sh --force
       shell: bash -leo pipefail {0}
 
diff --git a/.github/scripts/run-tests.sh b/.github/scripts/run-tests.sh
index 582b5535..d04b07fc 100755
--- a/.github/scripts/run-tests.sh
+++ b/.github/scripts/run-tests.sh
@@ -139,7 +139,7 @@ case $1 in
         ;;
     chipyard-vortex)
         # FIXME fix args.bin
-        run_binary BINARY=$LOCAL_CHIPYARD_DIR/generators/rocket-gpu/stimuli/vecadd.elf
+        run_binary BINARY=$LOCAL_CHIPYARD_DIR/generators/rocket-gpu/stimuli/vecadd.bin.elf
         ;;
     chipyard-coalescer)
         run_binary BINARY=none
diff --git a/.gitmodules b/.gitmodules
index 9be7aba6..3d7620c8 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -135,4 +135,4 @@
 	url = https://github.com/ucb-bar/berkeley-hardfloat.git
 [submodule "generators/rocket-gpu"]
 	path = generators/rocket-gpu
-	url = https://github.com/hansungk/rocket-gpu.git
+	url = git@github.com:hansungk/rocket-gpu.git