diff --git a/deploy/update-test-server.sh b/deploy/update-test-server.sh
index 85f0c46..0f5df51 100755
--- a/deploy/update-test-server.sh
+++ b/deploy/update-test-server.sh
@@ -33,6 +33,30 @@ require_command()
     fi
 }
 
+# Cron runs with a bare PATH, so nvm-installed npm (added to PATH only by
+# .bashrc sourcing nvm.sh in an interactive shell) is invisible here even
+# though it works fine when this script is run by hand. Resolve nvm's
+# current npm via bash (nvm.sh is not POSIX sh compatible) and prepend it,
+# so a later `nvm use`/`nvm install` doesn't require updating this script
+# or the crontab.
+ensure_npm_on_path()
+{
+    command -v npm >/dev/null 2>&1 && return 0
+
+    nvm_dir=${NVM_DIR:-${HOME:-/root}/.nvm}
+    [ -s "$nvm_dir/nvm.sh" ] || return 0
+    command -v bash >/dev/null 2>&1 || return 0
+
+    npm_path=$(bash -c ". \"\$1/nvm.sh\" >/dev/null 2>&1 && command -v npm" _ "$nvm_dir" 2>/dev/null) || return 0
+    [ -n "$npm_path" ] || return 0
+
+    PATH=$(dirname -- "$npm_path"):$PATH
+    export PATH
+    log "Resolved npm via nvm: $npm_path"
+}
+
+ensure_npm_on_path
+
 git_in()
 {
     repository=$1