diff --git a/Dockerfile b/Dockerfile
index 159cef7..e8993df 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-# Copyright 2018 Google LLC. All rights reserved.
+# Copyright 2024 Google LLC. All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -11,16 +11,16 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 
-FROM marketplace.gcr.io/google/debian11
+FROM marketplace.gcr.io/google/debian12
 
-ENV PACKER_VERSION 1.8.3
-ENV PACKER_SHA256 0587f7815ed79589cd9c2b754c82115731c8d0b8fd3b746fe40055d969facba5
-ENV PACKER_BINARY /bin/packer
+ENV PACKER_VERSION=1.11.2
+ENV PACKER_SHA256=ced13efc257d0255932d14b8ae8f38863265133739a007c430cae106afcfc45a
+ENV PACKER_BINARY=/bin/packer
 
-ENV CHEF_DIR /chef
-ENV PACKER_DIR /packer/templates
-ENV TESTS_DIR /tests
-ENV KEY_FILE_PATH /service-account.json
+ENV CHEF_DIR=/chef
+ENV PACKER_DIR=/packer/templates
+ENV TESTS_DIR=/tests
+ENV KEY_FILE_PATH=/service-account.json
 
 # Installs packages
 RUN set -eux \
diff --git a/cloudbuild.yaml b/cloudbuild.yaml
index dee4112..7b851e5 100644
--- a/cloudbuild.yaml
+++ b/cloudbuild.yaml
@@ -1,4 +1,4 @@
-timeout: 600s
+timeout: 800s
 options:
   workerPool: projects/${PROJECT_ID}/locations/us-central1/workerPools/gcb-workers-pool-e2
 steps:
diff --git a/scripts/build-vm-image.sh b/scripts/build-vm-image.sh
index f41b0e2..8413aeb 100755
--- a/scripts/build-vm-image.sh
+++ b/scripts/build-vm-image.sh
@@ -95,6 +95,10 @@ python3 "${SCRIPT_DIR}/packergen.py" "${INPUT_TEMPLATE}" > /tmp/template.json
 
 echo "Packer: $("${PACKER_BINARY}" -v)"
 
+# Install googlecompute and chef plugins
+"${PACKER_BINARY}" plugins install github.com/hashicorp/googlecompute
+"${PACKER_BINARY}" plugins install github.com/hashicorp/chef
+
 # Build the packer command
 PACKER_COMMAND=("${PACKER_BINARY}" build -color=false)
 PACKER_COMMAND+=(-var "chefdir=${CHEF_DIR}")
diff --git a/scripts/packergen.py b/scripts/packergen.py
index a78854a..d21f53c 100644
--- a/scripts/packergen.py
+++ b/scripts/packergen.py
@@ -20,8 +20,8 @@
 
 # Install chef-solo via deb package.
 INSTALL_CHEF_SOLO = r"""
-declare -r VERSION=18.2.7
-declare -r SHA256=a4461840de71f08f11f3c65a6d2f40f41d394e98f84979f7a8388ed0b578c666
+declare -r VERSION=18.5.0
+declare -r SHA256=1918e72eebeea0dd2f7680b08f1362d699b37570431ebca3c1b4fbe40cfc2abb
 
 curl "https://packages.chef.io/files/stable/chef/${VERSION}/debian/11/chef_${VERSION}-1_amd64.deb" -o chef-solo.deb \
   && echo "${SHA256} chef-solo.deb" | sha256sum -c \
diff --git a/scripts/run-tests.sh b/scripts/run-tests.sh
index fefbc95..697449b 100755
--- a/scripts/run-tests.sh
+++ b/scripts/run-tests.sh
@@ -94,6 +94,12 @@ while (( ${index} <= ${max_connection_attempts} )); do
 done
 
 # Create $IMAGEBUILDER_TEST_DIR directory and upload tests there
+echo "Copying tests to the tester instance..."
+ssh -i "${PRIVATE_SSH_KEY}" \
+    -o UserKnownHostsFile="${TEMPDIR}/known_hosts" \
+    -o StrictHostKeyChecking=no \
+    "${USER}@${IP}" \
+    "/bin/bash -e -c 'mkdir -p "${IMAGEBUILDER_TEST_DIR}"'"
 scp -r \
     -i "${PRIVATE_SSH_KEY}" \
     -o UserKnownHostsFile="${TEMPDIR}/known_hosts" \
@@ -101,11 +107,12 @@ scp -r \
     "${TESTS_DIR}" "${USER}@${IP}:${IMAGEBUILDER_TEST_DIR}/"
 
 # Run tests
+echo "Running tests in tester instance..."
 ssh -i "${PRIVATE_SSH_KEY}" \
     -o UserKnownHostsFile="${TEMPDIR}/known_hosts" \
     -o StrictHostKeyChecking=no \
     "${USER}@${IP}" \
-    "/bin/bash -eu -c 'chmod +x ${IMAGEBUILDER_TEST_DIR}/run-tests-on-instance.sh && PACKER_SSH_USERNAME=${PACKER_SSH_USERNAME} SOLUTION_NAME=${SOLUTION_NAME} ${IMAGEBUILDER_TEST_DIR}/run-tests-on-instance.sh'" \
+    "/bin/bash -eu -c 'chmod +x ${IMAGEBUILDER_TEST_DIR}/tests/run-tests-on-instance.sh && PACKER_SSH_USERNAME=${PACKER_SSH_USERNAME} SOLUTION_NAME=${SOLUTION_NAME} ${IMAGEBUILDER_TEST_DIR}/tests/run-tests-on-instance.sh'" \
       && lcstatus=$? || lcstatus=$?
 
 echo "--> Deleting the temporary instance (${INSTANCE}) ..."