diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0ac81e3..d1e2201 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+#### Changed
+
+- If available, use pdfmanagement instead of \pdfpagesattr
+
 ## 1.1.0 - 2020-05-10
 
 ### Added
diff --git a/llncsconf.sty b/llncsconf.sty
index 58deba2..264dcd3 100644
--- a/llncsconf.sty
+++ b/llncsconf.sty
@@ -45,13 +45,27 @@
 
 % <crop>
 \ifthenelse{\boolean{crop}}{%
+\ExplSyntaxOn
+\@ifundefined{pdfmanagement_add:nnn}{%
   \@ifclasswith{llncs}{a4paper}{%
     \pdfpagesattr{/CropBox [92 114 523 780]}%
   }{%
     \pdfpagesattr{/CropBox [92 65 523 731]}% LNCS page: 152x235 mm
   }%
+}{%
+  \@ifclasswith{llncs}{a4paper}{%
+    \pdfmanagement_add:nnn {Pages}{CropBox}{[92~114~523~780]}   
+  }{%
+    \pdfmanagement_add:nnn {Pages}{CropBox}{[92~62~523~731]}   
+  }%
+}%
+\ExplSyntaxOff
 }{}
 % </crop>
+
+
+
+
 \def\ps@svninfofirst{\let\@mkboth\@gobbletwo\let\@oddhead\@empty\let\@evenhead\@empty
      \def\@oddfoot{\reset@font\scriptsize
      \vbox to\z@{\parindent=\z@\vss