diff --git a/extlib/benz b/extlib/benz
index 8c174cd5..dd80aff0 160000
--- a/extlib/benz
+++ b/extlib/benz
@@ -1 +1 @@
-Subproject commit 8c174cd505aa4fc3b7937819506423b39b405216
+Subproject commit dd80aff03ab36fea0633e0e449c71fd489bc738a
diff --git a/piclib/picrin/base.scm b/piclib/picrin/base.scm
index 92180e92..ead1be72 100644
--- a/piclib/picrin/base.scm
+++ b/piclib/picrin/base.scm
@@ -441,8 +441,7 @@
           dictionary-ref
           dictionary-set!
           dictionary-delete
-          dictionary-size
-          dictionary-for-each)
+          dictionary-size)
 
   (export make-record
           record?
diff --git a/piclib/picrin/dictionary.scm b/piclib/picrin/dictionary.scm
index 4ad679e9..c5205711 100644
--- a/piclib/picrin/dictionary.scm
+++ b/piclib/picrin/dictionary.scm
@@ -1,22 +1,6 @@
 (define-library (picrin dictionary)
   (import (picrin base))
 
-  (define (dictionary-map proc dict)
-    (let ((kvs '()))
-      (dictionary-for-each
-       (lambda (key val)
-         (set! kvs (cons (proc key val) kvs)))
-       dict)
-      (reverse kvs)))
-
-  (define (dictionary->plist dict)
-    (let ((kvs '()))
-      (dictionary-for-each
-       (lambda (key val)
-         (set! kvs (cons val (cons key kvs))))
-       dict)
-      (reverse kvs)))
-
   (define (plist->dictionary plist)
     (let ((dict (make-dictionary)))
       (do ((kv plist (cddr kv)))
@@ -24,12 +8,6 @@
            dict)
         (dictionary-set! dict (car kv) (cadr kv)))))
 
-  (define (dictionary->alist dict)
-    (dictionary-map
-     (lambda (key val)
-       (cons key val))
-     dict))
-
   (define (alist->dictionary alist)
     (let ((dict (make-dictionary)))
       (do ((kv alist (cdr kv)))
@@ -40,9 +18,12 @@
   (define (dictionary . plist)
     (plist->dictionary plist))
 
-  (export dictionary
-          dictionary-map
-          dictionary->plist
+  (export dictionary?
+          dictionary
+          make-dictionary
+          dictionary-ref
+          dictionary-set!
+          dictionary-delete
+          dictionary-size
           plist->dictionary
-          dictionary->alist
           alist->dictionary))