diff --git a/.env.example b/.env.example
index 5166f7b..742b580 100644
--- a/.env.example
+++ b/.env.example
@@ -2,5 +2,6 @@ WEBSITE_ENV=
 WEBSITE_URL=
 MICROCMS_SERVICE_DOMAIN=
 MICROCMS_API_KEY=
+MICROCMS_WEBHOOK_KEY=
 CLOUDFLARE_ZONE_ID=
 CLOUDFLARE_API_KEY=
diff --git a/qlfile b/qlfile
index 1b680f7..b4862b2 100644
--- a/qlfile
+++ b/qlfile
@@ -11,3 +11,4 @@ ql local-time
 ql function-cache
 ql jonathan
 ql access
+ql flexi-streams
diff --git a/qlfile.lock b/qlfile.lock
index f3d33ac..6421bac 100644
--- a/qlfile.lock
+++ b/qlfile.lock
@@ -54,3 +54,7 @@
  (:class qlot/source/ql:source-ql
   :initargs (:%version :latest)
   :version "ql-2024-10-12"))
+("flexi-streams" .
+ (:class qlot/source/ql:source-ql
+  :initargs (:%version :latest)
+  :version "ql-2024-10-12"))
diff --git a/src/components/header.lisp b/src/components/header.lisp
index d4a2f9c..9546095 100644
--- a/src/components/header.lisp
+++ b/src/components/header.lisp
@@ -1,6 +1,7 @@
 (defpackage #:website/components/header
   (:use #:cl
-        #:website/helper)
+        #:hsx
+        #:jingle)
   (:export #:~header))
 (in-package #:website/components/header)
 
diff --git a/src/components/metadata.lisp b/src/components/metadata.lisp
index 780e2c8..f8fb04a 100644
--- a/src/components/metadata.lisp
+++ b/src/components/metadata.lisp
@@ -1,6 +1,7 @@
 (defpackage #:website/components/metadata
   (:use #:cl
-        #:website/helper)
+        #:hsx
+        #:jingle)
   (:import-from #:website/lib/env
                 #:website-url)
   (:export #:~metadata))
diff --git a/src/helper.lisp b/src/helper.lisp
index a367676..c208395 100644
--- a/src/helper.lisp
+++ b/src/helper.lisp
@@ -1,15 +1,26 @@
 (uiop:define-package #:website/helper
-  (:use #:cl)
-  (:use-reexport #:hsx
-                 #:jingle
-                 #:jonathan
-                 #:access)
-  (:export #:api-p))
+  (:use #:cl
+        #:jingle)
+  (:import-from #:flexi-streams
+                #:make-flexi-stream)
+  (:import-from #:jonathan
+                #:parse)
+  (:export #:api-request-p
+           #:get-request-body-plist))
 (in-package #:website/helper)
 
 (defun starts-with-p (prefix string)
   (let ((pos (search prefix string :start1 0 :end1 (length prefix) :start2 0)))
     (and pos (= pos 0))))
 
-(defun api-p ()
+(defun api-request-p ()
   (starts-with-p "/api/" (request-uri *request*)))
+
+(defun get-request-body-plist ()
+  (parse
+   (let ((text-stream (make-flexi-stream (request-raw-body *request*)
+                                         :external-format :utf-8)))
+     (with-output-to-string (out)
+       (loop :for char := (read-char text-stream nil)
+             :while char
+             :do (write-char char out))))))
diff --git a/src/lib/cms.lisp b/src/lib/cms.lisp
index 7f24118..7f75c80 100644
--- a/src/lib/cms.lisp
+++ b/src/lib/cms.lisp
@@ -17,21 +17,19 @@
 (setf microcms:*service-domain* (microcms-service-domain))
 (setf microcms:*api-key* (microcms-api-key))
 
-(defmacro memorize (name timeout)
+(defmacro memorize (name)
   (let ((origin (gensym)))
     `(progn
        (setf (fdefinition ',origin) (fdefinition ',name))
-       (defcached (,name :timeout ,timeout) (&key query)
+       (defcached ,name (&key query)
          (,origin :query query)))))
 
-(defparameter *timeout* 60)
-
 (define-object-client about)
-(memorize get-about *timeout*)
+(memorize get-about)
 
 (define-object-client work)
-(memorize get-work *timeout*)
+(memorize get-work)
 
 (define-list-client blog)
-(memorize get-blog-list *timeout*)
-(memorize get-blog-detail *timeout*)
+(memorize get-blog-list)
+(memorize get-blog-detail)
diff --git a/src/lib/env.lisp b/src/lib/env.lisp
index a6e1ffb..f0a4bb1 100644
--- a/src/lib/env.lisp
+++ b/src/lib/env.lisp
@@ -18,3 +18,4 @@
 (env-var website-url "WEBSITE_URL")
 (env-var microcms-service-domain "MICROCMS_SERVICE_DOMAIN")
 (env-var microcms-api-key "MICROCMS_API_KEY")
+(env-var microcms-webhook-key "MICROCMS_WEBHOOK_KEY")
diff --git a/src/renderer.lisp b/src/renderer.lisp
index 64c6724..7863e38 100644
--- a/src/renderer.lisp
+++ b/src/renderer.lisp
@@ -1,8 +1,11 @@
 (defpackage #:website/renderer
   (:use #:cl
-        #:website/helper)
-  (:import-from #:hsx/element
-                #:element)
+        #:hsx
+        #:jingle)
+  (:import-from #:jonathan
+                #:to-json)
+  (:import-from #:website/helper
+                #:api-request-p)
   (:import-from #:website/components/metadata
                 #:~metadata)
   (:import-from #:website/components/scripts
@@ -14,7 +17,7 @@
 (defmethod jingle:process-response :around ((app jingle:app) result)
   (when (eq (request-method *request*) :get)
     (set-response-header :cache-control "public, max-age=60"))
-  (cond ((api-p)
+  (cond ((api-request-p)
          (set-response-header :content-type "application/json; charset=utf-8") 
          (call-next-method app (to-json result)))
         (t
diff --git a/src/routes/about.lisp b/src/routes/about.lisp
index fa84d69..1fd330c 100644
--- a/src/routes/about.lisp
+++ b/src/routes/about.lisp
@@ -1,6 +1,8 @@
 (defpackage #:website/routes/about
   (:use #:cl
-        #:website/helper)
+        #:hsx
+        #:jingle
+        #:access)
   (:import-from #:website/lib/cms
                 #:get-about)
   (:import-from #:website/lib/time
diff --git a/src/routes/api/revalidate.lisp b/src/routes/api/revalidate.lisp
new file mode 100644
index 0000000..7c0457e
--- /dev/null
+++ b/src/routes/api/revalidate.lisp
@@ -0,0 +1,24 @@
+(defpackage #:website/routes/api/revalidate
+  (:use #:cl
+        #:jingle)
+  (:import-from #:function-cache
+                #:clear-cache)
+  (:import-from #:website/lib/env
+                #:microcms-webhook-key)
+  (:import-from #:website/helper
+                #:get-request-body-plist)
+  (:import-from #:website/lib/cms
+                #:get-about)
+  (:export #:handle-post))
+(in-package #:website/routes/api/revalidate)
+
+(defun handle-post (params)
+  (declare (ignore params))
+  (unless (string= (car (get-request-header "X-MICROCMS-WEBHOOK-KEY"))
+                   (microcms-webhook-key))
+    (set-response-status :unauthorized)
+    (return-from handle-post '(:|message| "Invalid token")))
+  (let* ((body (get-request-body-plist))
+         (api (getf body :|api|)))
+    (cond ((string= api "about") (clear-cache 'get-about)))
+    '(:|message| "ok")))
diff --git a/src/routes/blog.lisp b/src/routes/blog.lisp
index 051e7df..820b359 100644
--- a/src/routes/blog.lisp
+++ b/src/routes/blog.lisp
@@ -1,6 +1,7 @@
 (defpackage #:website/routes/blog
   (:use #:cl
-        #:website/helper)
+        #:hsx
+        #:jingle)
   (:export #:handle-get))
 (in-package #:website/routes/blog)
 
diff --git a/src/routes/index.lisp b/src/routes/index.lisp
index fe78adb..398abbc 100644
--- a/src/routes/index.lisp
+++ b/src/routes/index.lisp
@@ -1,6 +1,7 @@
 (defpackage #:website/routes/index
   (:use #:cl
-        #:website/helper)
+        #:hsx
+        #:access)
   (:import-from #:website/lib/cms
                 #:get-about)
   (:export #:handle-get
diff --git a/src/routes/not-found.lisp b/src/routes/not-found.lisp
index b5ca783..163ff70 100644
--- a/src/routes/not-found.lisp
+++ b/src/routes/not-found.lisp
@@ -1,6 +1,9 @@
 (defpackage #:website/routes/not-found
   (:use #:cl
-        #:website/helper)
+        #:hsx
+        #:jingle)
+  (:import-from #:website/helper
+                #:api-request-p)
   (:export #:handle-not-found))
 (in-package #:website/routes/not-found)
 
@@ -11,7 +14,7 @@
 
 (defun handle-not-found ()
   (setf (context :metadata) *metadata*)
-  (if (api-p)
+  (if (api-request-p)
       '(:|message| "404 Not Found")
       (hsx
        (div :class "flex flex-col h-full items-center justify-center gap-y-6"
diff --git a/src/routes/work.lisp b/src/routes/work.lisp
index 97114cc..c1e6cf4 100644
--- a/src/routes/work.lisp
+++ b/src/routes/work.lisp
@@ -1,6 +1,7 @@
 (defpackage #:website/routes/work
   (:use #:cl
-        #:website/helper)
+        #:hsx
+        #:jingle)
   (:import-from #:website/lib/cms
                 #:get-work)
   (:import-from #:website/lib/time