diff --git a/CHANGES.txt b/CHANGES.txt
index 96a54d4303..a442f11938 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -34,6 +34,8 @@ Merged from 3.0:
  * MigrationManager attempts to pull schema from different major version nodes (CASSANDRA-14928)
  * Fix incorrect cqlsh results when selecting same columns multiple times (CASSANDRA-13262)
  * Returns null instead of NaN or Infinity in JSON strings (CASSANDRA-14377)
+Merged from 2.1:
+ * Update release checksum algorithms to SHA-256, SHA-512 (CASSANDRA-14970)
 
 
 3.11.3
diff --git a/build.xml b/build.xml
index 8fefd176e2..c369cf346f 100644
--- a/build.xml
+++ b/build.xml
@@ -1142,14 +1142,14 @@
 
     <target name="release" depends="eclipse-warnings,artifacts,rat-init"
             description="Create and QC release artifacts">
-      <checksum forceOverwrite="yes" todir="${build.dir}" fileext=".md5"
-                algorithm="MD5">
+      <checksum forceOverwrite="yes" todir="${build.dir}" fileext=".sha256"
+                algorithm="SHA-256">
         <fileset dir="${build.dir}">
           <include name="*.tar.gz" />
         </fileset>
       </checksum>
-      <checksum forceOverwrite="yes" todir="${build.dir}" fileext=".sha"
-                algorithm="SHA">
+      <checksum forceOverwrite="yes" todir="${build.dir}" fileext=".sha512"
+                algorithm="SHA-512">
         <fileset dir="${build.dir}">
           <include name="*.tar.gz" />
         </fileset>