diff --git a/.github/workflows/build_slim_packages.yaml b/.github/workflows/build_slim_packages.yaml
index 56d2a6394..eeba6b6e0 100644
--- a/.github/workflows/build_slim_packages.yaml
+++ b/.github/workflows/build_slim_packages.yaml
@@ -80,7 +80,9 @@ jobs:
     - uses: actions/upload-artifact@v2
       with:
         name: "${{ matrix.profile }}_schema_dump"
-        path: _build/*/lib/emqx_dashboard/priv/www/static/schema.json
+        path: |
+          scripts/spellcheck
+          _build/${{ matrix.profile }}/lib/emqx_dashboard/priv/www/static/schema.json
 
   windows:
     runs-on: windows-2019
@@ -205,7 +207,6 @@ jobs:
         - emqx
         - emqx-enterprise
     runs-on: aws-amd64
-    container: "ghcr.io/emqx/emqx-schema-validate:0.3.3"
     steps:
     - uses: actions/download-artifact@v2
       name: Download schema dump
@@ -214,9 +215,7 @@ jobs:
         path: /tmp/
     - name: Run spellcheck
       run: |
-        cd /LanguageTool
-        bash start.sh > /dev/null &
-        ./emqx_schema_validate /tmp/${{ matrix.profile }}/lib/emqx_dashboard/priv/www/static/schema.json
+        bash /tmp/scripts/spellcheck/spellcheck.sh /tmp/_build/${{ matrix.profile }}/lib/emqx_dashboard/priv/www/static/schema.json
 
   allgood_packaging:
     runs-on: ubuntu-latest
diff --git a/scripts/spellcheck b/scripts/spellcheck
deleted file mode 100755
index 51d8d2907..000000000
--- a/scripts/spellcheck
+++ /dev/null
@@ -1,21 +0,0 @@
-#!/bin/bash
-set -uo pipefail
-
-if [ -z "${1:-}" ]; then
-    SCHEMA="_build/emqx/lib/emqx_dashboard/priv/www/static/schema.json"
-else
-    SCHEMA="$1"
-fi
-
-docker run -d --name langtool "ghcr.io/emqx/emqx-schema-validate:0.3.3"
-
-docker exec -i langtool ./emqx_schema_validate - < "${SCHEMA}"
-success="$?"
-
-docker kill langtool || true
-docker rm langtool || true
-
-echo "If this script finds a false positive (e.g. when it things that a protocol name is a typo),
-make a PR here: https://github.com/emqx/emqx-schema-validate/blob/master/dict/en_spelling_additions.txt"
-
-exit "$success"
diff --git a/scripts/spellcheck/dicts/emqx.txt b/scripts/spellcheck/dicts/emqx.txt
new file mode 100644
index 000000000..8355e3d03
--- /dev/null
+++ b/scripts/spellcheck/dicts/emqx.txt
@@ -0,0 +1,265 @@
+ACL
+AES
+APIs
+BPAPI
+BSON
+Backplane
+CA
+CAs
+CHACHA
+CLI
+CMD
+CN
+CONNACK
+CoAP
+Cygwin
+DES
+DN
+DNS
+DTLS
+DevOps
+Dialyzer
+Diffie
+EIP
+EMQX
+EPMD
+ERL
+ETS
+FIXME
+GCM
+HMAC
+HOCON
+HTTPS
+JSON
+JWK
+JWKs
+JWT
+Kubernetes
+LwM
+MQTT
+Makefile
+MitM
+Multicast
+NIF
+OTP
+PEM
+PINGREQ
+PSK
+PSK
+PSKs
+PUBREL
+QoS
+RESTful
+ROADMAP
+RSA
+Req
+Riak
+SHA
+SMS
+Struct
+TCP
+TLS
+TTL
+UDP
+URI
+XMLs
+acceptors
+ack
+acked
+addr
+api
+apiserver
+arg
+args
+async
+attr
+auth
+authenticator
+authenticators
+authn
+authz
+autoclean
+autoheal
+backend
+backends
+backoff
+backplane
+backtrace
+badarg
+badkey
+bcrypt
+behaviour
+bhvr
+boolean
+bytesize
+cacert
+cacertfile
+certfile
+ci
+clientid
+clientinfo
+cmake
+coap
+conf
+config
+configs
+confirmable
+conn
+connectionless
+cors
+cpu
+ctx
+customizable
+datagram
+datagrams
+desc
+dir
+dns
+downlink
+downlink
+dtls
+ekka
+emqx
+enablement
+enqueue
+enqueued
+env
+eof
+epmd
+erl
+erts
+escript
+etcd
+eval
+exe
+executables
+exhook
+exproto
+extensibility
+formatter
+gRPC
+github
+goto
+grpcbox
+hocon
+hoconsc
+hostname
+hrl
+http
+https
+iface
+img
+impl
+inet
+inflight
+ini
+init
+ip
+ipv
+jenkins
+jq
+kb
+keepalive
+libcoap
+lifecycle
+localhost
+lwm
+mnesia
+mountpoint
+mqueue
+mria
+msg
+multicalls
+multicasts
+namespace
+natively
+nodelay
+nodetool
+nullable
+num
+os
+params
+peerhost
+peername
+perf
+powershell
+procmem
+procs
+progname
+prometheus
+proto
+ps
+psk
+pubsub
+pushgateway
+qlen
+qmode
+qos
+quic
+ratelimit
+rebar
+recbuf
+relup
+replayq
+replicant
+repo
+reuseaddr
+rh
+rlog
+rootdir
+rpc
+runtime
+sc
+scalable
+seg
+setcookie
+sharded
+shareload
+sn
+sndbuf
+sockname
+sql
+src
+ssl
+statsd
+structs
+subprotocol
+subprotocols
+superset
+sys
+sysmem
+sysmon
+tcp
+ticktime
+tlog
+tls
+tlsv
+travis
+trie
+ttl
+typerefl
+udp
+uid
+un-acked
+unsub
+uplink
+url
+utc
+util
+ver
+vm
+vsn
+wakaama
+websocket
+ws
+wss
+xml
+HStream
+HStreamDB
+hstream
+hstreamDB
+hstream
+hstreamdb
+SASL
+GSSAPI
+keytab
diff --git a/scripts/spellcheck/spellcheck.sh b/scripts/spellcheck/spellcheck.sh
new file mode 100755
index 000000000..a21fc93ec
--- /dev/null
+++ b/scripts/spellcheck/spellcheck.sh
@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+# ensure dir
+cd -P -- "$(dirname -- "${BASH_SOURCE[0]}")/../.."
+PROJ_ROOT="$(pwd)"
+
+if [ -z "${1:-}" ]; then
+    SCHEMA="${PROJ_ROOT}/_build/emqx/lib/emqx_dashboard/priv/www/static/schema.json"
+else
+    SCHEMA="$(realpath "$1")"
+fi
+
+set +e
+docker run --rm -i --name spellcheck \
+    -v "${PROJ_ROOT}"/scripts/spellcheck/dicts:/dicts \
+    -v "$SCHEMA":/schema.json \
+    ghcr.io/emqx/emqx-schema-validate:0.4.0 /schema.json
+
+result="$?"
+
+if [ "$result" -eq 0 ]; then
+    echo "Spellcheck OK"
+    exit 0
+fi
+
+echo "If this script finds a false positive (e.g. when it thinks that a protocol name is a typo),"
+echo "Add the word to dictionary in scripts/spellcheck/dicts"
+exit $result