diff --git a/docs/community/release-notes.md b/docs/community/release-notes.md
index 0efc7fa6c..e1fb87afd 100644
--- a/docs/community/release-notes.md
+++ b/docs/community/release-notes.md
@@ -42,7 +42,8 @@ You can determine your currently installed version using `pip show`:
 
 ### 3.9.2 - IN DEVELOPMENT
 
-...
+* Resolve DeprecationWarning with markdown. [#6317][gh6317]
+* Upgrade markdown to 3.0.1 to avoid deprecation issue.
 
 ### 3.9.1
 
diff --git a/requirements/requirements-optionals.txt b/requirements/requirements-optionals.txt
index c800a5891..5cef08725 100644
--- a/requirements/requirements-optionals.txt
+++ b/requirements/requirements-optionals.txt
@@ -1,6 +1,6 @@
 # Optional packages which may be used with REST framework.
 psycopg2-binary==2.7.5
-markdown==2.6.11
+markdown==3.0.1
 django-guardian==1.5.0
 django-filter==1.1.0
 coreapi==2.3.1
diff --git a/rest_framework/compat.py b/rest_framework/compat.py
index 5a4bcdf66..77af69ddc 100644
--- a/rest_framework/compat.py
+++ b/rest_framework/compat.py
@@ -258,7 +258,7 @@ if markdown is not None and pygments is not None:
             return ret.split("\n")
 
     def md_filter_add_syntax_highlight(md):
-        md.preprocessors.add('highlight', CodeBlockPreprocessor(), "_begin")
+        md.preprocessors.register(CodeBlockPreprocessor(), 'highlight', 40)
         return True
 else:
     def md_filter_add_syntax_highlight(md):