diff --git a/cache/articlecache.go b/cache/articlecache.go
index c4b36225..6010b6c3 100644
--- a/cache/articlecache.go
+++ b/cache/articlecache.go
@@ -19,6 +19,7 @@ package cache
 
 import (
 	"os"
+	"time"
 
 	"github.com/88250/gulu"
 	"github.com/88250/pipe/model"
@@ -30,7 +31,7 @@ var logger = gulu.Log.NewLogger(os.Stdout)
 
 // Article cache.
 var Article = &articleCache{
-	idHolder: gcache.New(1024 * 10).LRU().Build(),
+	idHolder: gcache.New(1024 * 10).LRU().Expiration(30 * time.Minute).Build(),
 }
 
 type articleCache struct {
diff --git a/cache/commentcache.go b/cache/commentcache.go
index c7eb045e..8e38f9e9 100644
--- a/cache/commentcache.go
+++ b/cache/commentcache.go
@@ -17,13 +17,15 @@
 package cache
 
 import (
+	"time"
+
 	"github.com/88250/pipe/model"
 	"github.com/bluele/gcache"
 )
 
 // Comment service.
 var Comment = &commentCache{
-	idHolder: gcache.New(1024 * 10 * 10).LRU().Build(),
+	idHolder: gcache.New(1024 * 10 * 10).LRU().Expiration(30 * time.Minute).Build(),
 }
 
 type commentCache struct {
diff --git a/cache/settingcache.go b/cache/settingcache.go
index e3aaf93a..bdc30f3b 100644
--- a/cache/settingcache.go
+++ b/cache/settingcache.go
@@ -18,6 +18,7 @@ package cache
 
 import (
 	"fmt"
+	"time"
 
 	"github.com/88250/pipe/model"
 	"github.com/bluele/gcache"
@@ -25,7 +26,7 @@ import (
 
 // Setting cache.
 var Setting = &settingCache{
-	categoryNameHolder: gcache.New(1024 * 10).LRU().Build(),
+	categoryNameHolder: gcache.New(1024 * 10).LRU().Expiration(30 * time.Minute).Build(),
 }
 
 type settingCache struct {
diff --git a/cache/usercache.go b/cache/usercache.go
index cf194dfc..9d9d841c 100644
--- a/cache/usercache.go
+++ b/cache/usercache.go
@@ -17,13 +17,15 @@
 package cache
 
 import (
+	"time"
+
 	"github.com/88250/pipe/model"
 	"github.com/bluele/gcache"
 )
 
 // User cache.
 var User = &userCache{
-	idHolder: gcache.New(1024 * 10).LRU().Build(),
+	idHolder: gcache.New(1024 * 10).LRU().Expiration(30 * time.Minute).Build(),
 }
 
 type userCache struct {
diff --git a/util/markdowns.go b/util/markdowns.go
index 1b612538..6cd3de51 100644
--- a/util/markdowns.go
+++ b/util/markdowns.go
@@ -20,16 +20,17 @@ import (
 	"crypto/md5"
 	"regexp"
 	"strings"
+	"time"
 	"unicode"
 	"unicode/utf8"
 
-	"github.com/PuerkitoBio/goquery"
 	"github.com/88250/lute"
+	"github.com/PuerkitoBio/goquery"
 	"github.com/bluele/gcache"
 	"github.com/microcosm-cc/bluemonday"
 )
 
-var markdownCache = gcache.New(1024).LRU().Build()
+var markdownCache = gcache.New(1024).LRU().Expiration(30 * time.Minute).Build()
 
 // MarkdownResult represents markdown result.
 type MarkdownResult struct {