diff --git a/scripts/install_anr.sh b/scripts/install_anr.sh
new file mode 100755
index 000000000000..148321dee50d
--- /dev/null
+++ b/scripts/install_anr.sh
@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+set -e
+set -o nounset
+set -o pipefail
+
+# Avalanche root directory
+AVALANCHE_PATH=$(
+  cd "$(dirname "${BASH_SOURCE[0]}")"
+  cd .. && pwd
+)
+
+# Load the constants
+source "$AVALANCHE_PATH"/scripts/constants.sh
+
+#################################
+# download avalanche-network-runner
+# https://github.com/ava-labs/avalanche-network-runner
+GOARCH=$(go env GOARCH)
+GOOS=$(go env GOOS)
+NETWORK_RUNNER_VERSION=1.3.9
+anr_workdir=${ANR_WORKDIR:-"/tmp"}
+DOWNLOAD_PATH=${anr_workdir}/avalanche-network-runner-v${NETWORK_RUNNER_VERSION}.tar.gz
+DOWNLOAD_URL="https://github.com/ava-labs/avalanche-network-runner/releases/download/v${NETWORK_RUNNER_VERSION}/avalanche-network-runner_${NETWORK_RUNNER_VERSION}_${GOOS}_${GOARCH}.tar.gz"
+echo "Installing avalanche-network-runner ${NETWORK_RUNNER_VERSION} to ${anr_workdir}/avalanche-network-runner"
+
+# download only if not already downloaded
+if [ ! -f "$DOWNLOAD_PATH" ]; then
+  echo "downloading avalanche-network-runner ${NETWORK_RUNNER_VERSION} at ${DOWNLOAD_URL} to ${DOWNLOAD_PATH}"
+  curl --fail -L ${DOWNLOAD_URL} -o ${DOWNLOAD_PATH}
+else
+  echo "avalanche-network-runner ${NETWORK_RUNNER_VERSION} already downloaded at ${DOWNLOAD_PATH}"
+fi
+
+rm -f ${anr_workdir}/avalanche-network-runner
+
+echo "extracting downloaded avalanche-network-runner"
+tar xzvf ${DOWNLOAD_PATH} -C ${anr_workdir}
+${anr_workdir}/avalanche-network-runner -h
diff --git a/scripts/tests.e2e.sh b/scripts/tests.e2e.sh
index a12bea6d0a1f..67fd1b538b75 100755
--- a/scripts/tests.e2e.sh
+++ b/scripts/tests.e2e.sh
@@ -14,41 +14,14 @@ fi
 AVALANCHEGO_PATH="${1-}"
 if [[ -z "${AVALANCHEGO_PATH}" ]]; then
   echo "Missing AVALANCHEGO_PATH argument!"
-  echo "Usage: ${0} [AVALANCHEGO_PATH]" >> /dev/stderr
+  echo "Usage: ${0} [AVALANCHEGO_PATH]" >>/dev/stderr
   exit 255
 fi
 
-# Set the CGO flags to use the portable version of BLST
-#
-# We use "export" here instead of just setting a bash variable because we need
-# to pass this flag to all child processes spawned by the shell.
-export CGO_CFLAGS="-O -D__BLST_PORTABLE__"
-# While CGO_ENABLED doesn't need to be explicitly set, it produces a much more
-# clear error due to the default value change in go1.20.
-export CGO_ENABLED=1
-
 #################################
-# download avalanche-network-runner
-# https://github.com/ava-labs/avalanche-network-runner
-# TODO: migrate to upstream avalanche-network-runner
-GOARCH=$(go env GOARCH)
-GOOS=$(go env GOOS)
-NETWORK_RUNNER_VERSION=1.3.5-rc.0
-DOWNLOAD_PATH=/tmp/avalanche-network-runner.tar.gz
-DOWNLOAD_URL="https://github.com/ava-labs/avalanche-network-runner/releases/download/v${NETWORK_RUNNER_VERSION}/avalanche-network-runner_${NETWORK_RUNNER_VERSION}_${GOOS}_${GOARCH}.tar.gz"
-
-rm -f ${DOWNLOAD_PATH}
-rm -f /tmp/avalanche-network-runner
-
-echo "downloading avalanche-network-runner ${NETWORK_RUNNER_VERSION} at ${DOWNLOAD_URL} to ${DOWNLOAD_PATH}"
-curl --fail -L ${DOWNLOAD_URL} -o ${DOWNLOAD_PATH}
-
-echo "extracting downloaded avalanche-network-runner"
-tar xzvf ${DOWNLOAD_PATH} -C /tmp
-/tmp/avalanche-network-runner -h
-
-GOPATH="$(go env GOPATH)"
-PATH="${GOPATH}/bin:${PATH}"
+echo "installing avalanche-network-runner"
+ANR_WORKDIR="/tmp"
+./scripts/install_anr.sh
 
 #################################
 echo "building e2e.test"
@@ -60,23 +33,23 @@ ACK_GINKGO_RC=true ginkgo build ./tests/e2e
 #################################
 # run "avalanche-network-runner" server
 echo "launch avalanche-network-runner in the background"
-/tmp/avalanche-network-runner \
-server \
---log-level debug \
---port=":12342" \
---disable-grpc-gateway &
+$ANR_WORKDIR/avalanche-network-runner \
+  server \
+  --log-level debug \
+  --port=":12342" \
+  --disable-grpc-gateway &
 PID=${!}
 
 #################################
 echo "running e2e tests against the local cluster with ${AVALANCHEGO_PATH}"
 ./tests/e2e/e2e.test \
---ginkgo.v \
---log-level debug \
---network-runner-grpc-endpoint="0.0.0.0:12342" \
---network-runner-avalanchego-path=${AVALANCHEGO_PATH} \
---network-runner-avalanchego-log-level="WARN" \
---test-keys-file=tests/test.insecure.secp256k1.keys \
-&& EXIT_CODE=$? || EXIT_CODE=$?
+  --ginkgo.v \
+  --log-level debug \
+  --network-runner-grpc-endpoint="0.0.0.0:12342" \
+  --network-runner-avalanchego-path=${AVALANCHEGO_PATH} \
+  --network-runner-avalanchego-log-level="WARN" \
+  --test-keys-file=tests/test.insecure.secp256k1.keys &&
+  EXIT_CODE=$? || EXIT_CODE=$?
 
 kill ${PID}
 
diff --git a/scripts/tests.upgrade.sh b/scripts/tests.upgrade.sh
index 64608fafbaf6..14cba2b2a0e9 100755
--- a/scripts/tests.upgrade.sh
+++ b/scripts/tests.upgrade.sh
@@ -12,14 +12,14 @@ fi
 VERSION=$1
 if [[ -z "${VERSION}" ]]; then
   echo "Missing version argument!"
-  echo "Usage: ${0} [VERSION] [NEW-BINARY]" >> /dev/stderr
+  echo "Usage: ${0} [VERSION] [NEW-BINARY]" >>/dev/stderr
   exit 255
 fi
 
 NEW_BINARY=$2
 if [[ -z "${NEW_BINARY}" ]]; then
   echo "Missing new binary path argument!"
-  echo "Usage: ${0} [VERSION] [NEW-BINARY]" >> /dev/stderr
+  echo "Usage: ${0} [VERSION] [NEW-BINARY]" >>/dev/stderr
   exit 255
 fi
 
@@ -52,24 +52,9 @@ fi
 find /tmp/avalanchego-v${VERSION}
 
 #################################
-# download avalanche-network-runner
-# https://github.com/ava-labs/avalanche-network-runner
-NETWORK_RUNNER_VERSION=1.3.5-rc.0
-DOWNLOAD_PATH=/tmp/avalanche-network-runner.tar.gz
-DOWNLOAD_URL="https://github.com/ava-labs/avalanche-network-runner/releases/download/v${NETWORK_RUNNER_VERSION}/avalanche-network-runner_${NETWORK_RUNNER_VERSION}_${GOOS}_${GOARCH}.tar.gz"
-if [[ ${GOOS} == "darwin" ]]; then
-  DOWNLOAD_URL="https://github.com/ava-labs/avalanche-network-runner/releases/download/v${NETWORK_RUNNER_VERSION}/avalanche-network-runner_${NETWORK_RUNNER_VERSION}_darwin_amd64.tar.gz"
-fi
-
-rm -f ${DOWNLOAD_PATH}
-rm -f /tmp/avalanche-network-runner
-
-echo "downloading avalanche-network-runner ${NETWORK_RUNNER_VERSION} at ${DOWNLOAD_URL}"
-curl -L ${DOWNLOAD_URL} -o ${DOWNLOAD_PATH}
-
-echo "extracting downloaded avalanche-network-runner"
-tar xzvf ${DOWNLOAD_PATH} -C /tmp
-/tmp/avalanche-network-runner -h
+echo "installing avalanche-network-runner"
+ANR_WORKDIR="/tmp"
+./scripts/install_anr.sh
 
 #################################
 echo "building upgrade.test"
@@ -81,23 +66,23 @@ ACK_GINKGO_RC=true ginkgo build ./tests/upgrade
 #################################
 # run "avalanche-network-runner" server
 echo "launch avalanche-network-runner in the background"
-/tmp/avalanche-network-runner \
-server \
---log-level debug \
---port=":12340" \
---disable-grpc-gateway &
+$ANR_WORKDIR/avalanche-network-runner \
+  server \
+  --log-level debug \
+  --port=":12340" \
+  --disable-grpc-gateway &
 PID=${!}
 
 #################################
 # By default, it runs all upgrade test cases!
 echo "running upgrade tests against the local cluster with ${NEW_BINARY}"
 ./tests/upgrade/upgrade.test \
---ginkgo.v \
---log-level debug \
---network-runner-grpc-endpoint="0.0.0.0:12340" \
---network-runner-avalanchego-path=/tmp/avalanchego-v${VERSION}/avalanchego \
---network-runner-avalanchego-path-to-upgrade=${NEW_BINARY} \
---network-runner-avalanchego-log-level="WARN" || EXIT_CODE=$?
+  --ginkgo.v \
+  --log-level debug \
+  --network-runner-grpc-endpoint="0.0.0.0:12340" \
+  --network-runner-avalanchego-path=/tmp/avalanchego-v${VERSION}/avalanchego \
+  --network-runner-avalanchego-path-to-upgrade=${NEW_BINARY} \
+  --network-runner-avalanchego-log-level="WARN" || EXIT_CODE=$?
 
 # "e2e.test" already terminates the cluster
 # just in case tests are aborted, manually terminate them again