diff --git a/Installation/include/CGAL/version.h b/Installation/include/CGAL/version.h
index 26a92686edd..c9484b891d1 100644
--- a/Installation/include/CGAL/version.h
+++ b/Installation/include/CGAL/version.h
@@ -17,7 +17,7 @@
 #define CGAL_VERSION_H
 
 #ifndef SWIG
-#define CGAL_VERSION 5.1-beta2
+#define CGAL_VERSION 5.1-beta3
 #define CGAL_GIT_HASH abcdef
 #endif
 #define CGAL_VERSION_NR 1050100000
diff --git a/Installation/lib/cmake/CGAL/CGALConfigVersion.cmake b/Installation/lib/cmake/CGAL/CGALConfigVersion.cmake
index a4851a51e1d..62b7f345e81 100644
--- a/Installation/lib/cmake/CGAL/CGALConfigVersion.cmake
+++ b/Installation/lib/cmake/CGAL/CGALConfigVersion.cmake
@@ -2,7 +2,7 @@ set(CGAL_MAJOR_VERSION 5)
 set(CGAL_MINOR_VERSION 1)
 set(CGAL_BUGFIX_VERSION 0)
 include(${CMAKE_CURRENT_LIST_DIR}/CGALConfigBuildVersion.cmake)
-set(CGAL_VERSION_PUBLIC_RELEASE_VERSION "5.1-beta2")
+set(CGAL_VERSION_PUBLIC_RELEASE_VERSION "5.1-beta3")
 set(CGAL_VERSION_PUBLIC_RELEASE_NAME "CGAL-${CGAL_VERSION_PUBLIC_RELEASE_VERSION}")
 
 if (CGAL_BUGFIX_VERSION AND CGAL_BUGFIX_VERSION GREATER 0)
diff --git a/Maintenance/public_release/announcement/mailing-beta.eml b/Maintenance/public_release/announcement/mailing-beta.eml
index 9234c02b647..578addc45a6 100644
--- a/Maintenance/public_release/announcement/mailing-beta.eml
+++ b/Maintenance/public_release/announcement/mailing-beta.eml
@@ -1,14 +1,14 @@
-Subject: CGAL 5.1 Beta 1 Released, Computational Geometry Algorithms Library
+Subject: CGAL 5.1 Beta 2 Released, Computational Geometry Algorithms Library
 Content-Type: text/plain; charset="utf-8"
 Body:
 
-The CGAL Open Source Project is pleased to announce the release 5.1 Beta 1
+The CGAL Open Source Project is pleased to announce the release 5.1 Beta 2
 of CGAL, the Computational Geometry Algorithms Library.
 
 
-CGAL version 5.1 Beta 1 is a public testing release. It should provide a
+CGAL version 5.1 Beta 2 is a public testing release. It should provide a
 solid ground to report bugs that need to be tackled before the release
-of the final version of CGAL 5.1 in July.
+of the final version of CGAL 5.1 in September.
 
 
 Besides fixes and general enhancement to existing packages, the following
@@ -45,6 +45,11 @@ Optimal Bounding Box (new package)
     See also the associated blog entry:
       https://www.cgal.org/2020/04/20/Optimal_bounding_box/
 
+Installation
+
+-   The CGAL_Core library no longer requires Boost.Thread, even if the
+    g++ compiler is used.
+
 Tutorials
 
 -   Two new, detailed tutorials have been added: