diff --git a/Makefile b/Makefile
index 4f45263..ad1d2f7 100644
--- a/Makefile
+++ b/Makefile
@@ -62,11 +62,11 @@ FETCH_TARGETS += $(FETCHDIR)/libfuse-fuse-$(FUSE_VERSION).tar.gz
 $(FETCHDIR)/libfuse-fuse-$(FUSE_VERSION).tar.gz: URL := https://github.com/libfuse/libfuse/archive/fuse-$(FUSE_VERSION).tar.gz
 $(SKIP_MD5SUM)$(FETCHDIR)/libfuse-fuse-$(FUSE_VERSION).tar.gz: MD5 := 5f7c1062def710d8b60343524a18cc82
 
-WEBSOCKETS_VERSION ?= 3.2.0
+WEBSOCKETS_VERSION ?= 4.0.1
 DOCKER_BUILDARGS += WEBSOCKETS_VERSION=$(WEBSOCKETS_VERSION)
 FETCH_TARGETS += $(FETCHDIR)/libwebsockets-$(WEBSOCKETS_VERSION).tar.gz
 $(FETCHDIR)/libwebsockets-$(WEBSOCKETS_VERSION).tar.gz: URL := https://github.com/warmcat/libwebsockets/archive/v$(WEBSOCKETS_VERSION).tar.gz
-$(SKIP_MD5SUM)$(FETCHDIR)/libwebsockets-$(WEBSOCKETS_VERSION).tar.gz: MD5 := 1d06f5602604e67e6f50cef9857c6b0c
+$(SKIP_MD5SUM)$(FETCHDIR)/libwebsockets-$(WEBSOCKETS_VERSION).tar.gz: MD5 := b5f90b470f398abbcf66e4639ad0273a
 
 JANSSON_VERSION ?= 2.12
 DOCKER_BUILDARGS += JANSSON_VERSION=$(JANSSON_VERSION)
diff --git a/build/amd64-alpine-builder.dockerfile b/build/amd64-alpine-builder.dockerfile
index 6bd7713..6de467a 100644
--- a/build/amd64-alpine-builder.dockerfile
+++ b/build/amd64-alpine-builder.dockerfile
@@ -67,9 +67,11 @@ RUN set -x \
   && rm -rf "$builddir" \
   && apk del .build-deps
 
-ARG WEBSOCKETS_VERSION=3.2.0
+ARG WEBSOCKETS_VERSION=4.0.1
 
 RUN set -x \
+  && builddeps="linux-headers" \
+  && apk add --no-cache --virtual .build-deps $builddeps \
   && apk add --no-cache \
        ca-certificates \
        openssl \
@@ -79,7 +81,8 @@ RUN set -x \
   && cd "$builddir" \
   && cmake "/usr/local/src/libwebsockets-$WEBSOCKETS_VERSION" \
   && make "$PARALLELMFLAGS" install \
-  && rm -rf "$builddir"
+  && rm -rf "$builddir" \
+  && apk del .build-deps
 
 ARG JANSSON_VERSION=2.12
 
diff --git a/build/amd64-ubuntu-builder.dockerfile b/build/amd64-ubuntu-builder.dockerfile
index cbdc241..383de3a 100644
--- a/build/amd64-ubuntu-builder.dockerfile
+++ b/build/amd64-ubuntu-builder.dockerfile
@@ -65,7 +65,7 @@ RUN set -x \
   && rm -rf "$builddir" \
   && apt purge -y $builddeps
 
-ARG WEBSOCKETS_VERSION=3.2.0
+ARG WEBSOCKETS_VERSION=4.0.1
 
 RUN set -x \
   && apt install --yes --no-install-recommends \
diff --git a/build/arm32v7-alpine-builder.dockerfile b/build/arm32v7-alpine-builder.dockerfile
index 4eca9a6..2e7c5a3 100644
--- a/build/arm32v7-alpine-builder.dockerfile
+++ b/build/arm32v7-alpine-builder.dockerfile
@@ -71,9 +71,11 @@ RUN set -x \
   && rm -rf "$builddir" \
   && apk del .build-deps
 
-ARG WEBSOCKETS_VERSION=3.2.0
+ARG WEBSOCKETS_VERSION=4.0.1
 
 RUN set -x \
+  && builddeps="linux-headers" \
+  && apk add --no-cache --virtual .build-deps $builddeps \
   && apk add --no-cache \
        ca-certificates \
        openssl \
@@ -83,7 +85,8 @@ RUN set -x \
   && cd "$builddir" \
   && cmake "/usr/local/src/libwebsockets-$WEBSOCKETS_VERSION" \
   && make "$PARALLELMFLAGS" install \
-  && rm -rf "$builddir"
+  && rm -rf "$builddir" \
+  && apk del .build-deps
 
 ARG JANSSON_VERSION=2.12
 
diff --git a/build/arm32v7-ubuntu-builder.dockerfile b/build/arm32v7-ubuntu-builder.dockerfile
index a9da298..08e3c7d 100644
--- a/build/arm32v7-ubuntu-builder.dockerfile
+++ b/build/arm32v7-ubuntu-builder.dockerfile
@@ -68,7 +68,7 @@ RUN set -x \
   && rm -rf "$builddir" \
   && apt purge -y $builddeps
 
-ARG WEBSOCKETS_VERSION=3.2.0
+ARG WEBSOCKETS_VERSION=4.0.1
 
 RUN set -x \
   && apt install --yes --no-install-recommends \
diff --git a/doc/build.md b/doc/build.md
index fe16a11..6adb6f2 100644
--- a/doc/build.md
+++ b/doc/build.md
@@ -58,9 +58,9 @@ To install libfuse, meson is needed. Please refer to [meson quick guide](https:/
 
 #### libwebsockets
 
-    wget -O libwebsockets-3.2.0.tar.gz https://github.com/warmcat/libwebsockets/archive/v3.2.0.tar.gz
-    tar -xf libwebsockets-3.2.0.tar.gz
-    cd libwebsockets-3.2.0
+    wget -O libwebsockets-4.0.1.tar.gz https://github.com/warmcat/libwebsockets/archive/v4.0.1.tar.gz
+    tar -xf libwebsockets-4.0.1.tar.gz
+    cd libwebsockets-4.0.1
     mkdir .build
     cd .build
     cmake ..