diff --git a/bin/compile b/bin/compile
index 2e98dcb..701f110 100755
--- a/bin/compile
+++ b/bin/compile
@@ -16,22 +16,36 @@ function indent() {
     sed -e 's/^/       /'
 }
 
+function tailscale_latest_release_json() {
+   if [ -z "$LATEST_RELEASE_JSON" ]; then
+      LATEST_RELEASE_JSON=$(curl -s https://api.github.com/repos/tailscale/tailscale/releases/latest)
+    fi
+    echo "$LATEST_RELEASE_JSON"
+}
+
+function tailscale_latest_version() {
+  local version=$(jq -r '.tag_name' <<< "$(tailscale_latest_release_json)")
+  echo "${version#v}" # remove leading 'v'
+}
+
 # setup variables
 BUILD_DIR=$1
 CACHE_DIR=$2
 ENV_DIR=$3
 BUILDPACK_DIR="$(dirname "$(dirname "$0")")"
 
-TAILSCALE_VERSION=1.74.0
+TAILSCALE_VERSION=${TAILSCALE_VERSION:-$(tailscale_latest_version)}
 TAILSCALE_BUILD_ARCH=amd64
 TAILSCALE_SOURCE_URL="https://pkgs.tailscale.com/stable/tailscale_${TAILSCALE_VERSION}_${TAILSCALE_BUILD_ARCH}.tgz"
 TAILSCALE_INSTALL_DIR="$BUILD_DIR/vendor/tailscale"
 
-PROXYCHAINS_VERSION=4.17
+PROXYCHAINS_VERSION=${PROXYCHAINS_VERSION:-4.17}
 PROXYCHAINS_SOURCE_URL="https://github.com/rofl0r/proxychains-ng/archive/refs/tags/v$PROXYCHAINS_VERSION.tar.gz"
 PROXYCHAINS_INSTALL_DIR="$BUILD_DIR/vendor/proxychains-ng"
 
-log "Installing Tailscale"
+# TODO: a new version of Tailscale is available check.
+
+log "Installing Tailscale $TAILSCALE_VERSION"
 mkdir -p $TAILSCALE_INSTALL_DIR
 export PATH="$TAILSCALE_INSTALL_DIR:$PATH"
 curl -sL $TAILSCALE_SOURCE_URL \
@@ -45,10 +59,10 @@ chmod +x "$TAILSCALE_INSTALL_DIR/heroku-tailscale-test.sh"
 mkdir -p $BUILD_DIR/.profile.d
 echo 'export PATH="/app/vendor/tailscale:$PATH"' >> $BUILD_DIR/.profile.d/heroku-tailscale-buildpack.sh
 
-log "Installing ProxyChains-ng"
+log "Installing ProxyChains-ng $PROXYCHAINS_VERSION"
 PROXYCHAINS_BUILD_DIR="$CACHE_DIR/proxychains-ng-$PROXYCHAINS_VERSION"
-if [ ! -f "$PROXYCHAINS_BUILD_DIR/proxychains4" ]; then  
-  rm -rf $PROXYCHAINS_BUILD_DIR  
+if [ ! -f "$PROXYCHAINS_BUILD_DIR/proxychains4" ]; then
+  rm -rf $PROXYCHAINS_BUILD_DIR
   wget $PROXYCHAINS_SOURCE_URL -O $CACHE_DIR/proxychains.tar.gz
   cd $CACHE_DIR
   tar -zxvf $CACHE_DIR/proxychains.tar.gz
@@ -81,4 +95,4 @@ if [ -f "$BUILD_DIR/bin/rails" ]; then
   mv $BUILD_DIR/bin/rake $BUILD_DIR/bin/rake_original
   cp "$BUILDPACK_DIR/bin/rails/rake" $BUILD_DIR/bin/
   chmod +x $BUILD_DIR/bin/rake
-fi
\ No newline at end of file
+fi
diff --git a/bin/heroku-tailscale-start.sh b/bin/heroku-tailscale-start.sh
index ced4bfc..0adc7b3 100755
--- a/bin/heroku-tailscale-start.sh
+++ b/bin/heroku-tailscale-start.sh
@@ -8,20 +8,25 @@ if [ -z "$TAILSCALE_AUTH_KEY" ]; then
 fi
 
 wait_for_tailscale_running() {
-    timeout=5     # Timeout in seconds
-    interval=0.5  # Interval between checks
-    elapsed=0
-
-    while [ "$elapsed" -lt "$timeout" ]; do
-        state=$(tailscale status -json | jq -r .BackendState)
-        if [ "$state" = "Running" ]; then            
-            return 0
-        fi
-        sleep "$interval"
-        elapsed=$(echo "$elapsed + $interval" | bc)
-    done
-    
-    return 1
+  timeout=${TAILSCALE_RUNNING_TIMEOUT:-5} # Timeout in seconds
+  interval=0.5  # Interval between checks
+
+  # convert to milliseconds so we can use integer math
+  timeout_ms=$(awk "BEGIN {print $timeout * 1000}")
+  interval_ms=$(awk "BEGIN {print $interval * 1000}")
+
+  elapsed=0
+
+  while [ "$elapsed" -lt "$timeout_ms" ]; do
+    state=$(tailscale status -json | jq -r .BackendState)
+    if [ "$state" = "Running" ]; then
+      return 0
+    fi
+    sleep "$interval"
+    elapsed=$((elapsed + interval_ms))
+  done
+
+  return 1
 }
 
 if [ -z "$TAILSCALE_HOSTNAME" ]; then
@@ -39,14 +44,12 @@ else
   TAILSCALE_HOSTNAME="$TAILSCALE_HOSTNAME"
 fi
 tailscaled -cleanup > /dev/null 2>&1
-(tailscaled -verbose ${TAILSCALED_VERBOSE:--1} --tun=userspace-networking --socks5-server=localhost:1055 > /dev/null 2>&1 &)  
+(tailscaled -verbose ${TAILSCALED_VERBOSE:--1} --tun=userspace-networking --socks5-server=localhost:1055 > /dev/null 2>&1 &)
 tailscale up \
-  --authkey="${TAILSCALE_AUTH_KEY}?preauthorized=true&ephemeral=true" \
+  --authkey="${TAILSCALE_AUTH_KEY}" \
   --hostname="$TAILSCALE_HOSTNAME" \
   --advertise-tags=${TAILSCALE_ADVERTISE_TAGS:-} \
-  --accept-routes \
-  --timeout=15s \
-  ${TAILSCALE_ADDITIONAL_ARGS:---timeout=15s}
+  ${TAILSCALE_ADDITIONAL_ARGS:---accept-routes --timeout=15s}
 
 export ALL_PROXY=socks5://localhost:1055/