diff --git a/.upstream.d/20-github.com-sagemath-sage-releases b/.upstream.d/20-github.com-sagemath-sage-releases
index 0176fddf829..1ab20a34a06 100644
--- a/.upstream.d/20-github.com-sagemath-sage-releases
+++ b/.upstream.d/20-github.com-sagemath-sage-releases
@@ -1,4 +1,5 @@
 # Upstream packages as uploaded as GitHub release assets.
 # This file is automatically updated by the sage-update-version script.
+https://github.com/sagemath/sage/releases/download/10.3/
 https://github.com/sagemath/sage/releases/download/10.2/
 https://github.com/sagemath/sage/releases/download/10.1/
diff --git a/CITATION.cff b/CITATION.cff
index 6998dacb03a..33dda263384 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -4,8 +4,8 @@ title: SageMath
 abstract: SageMath is a free open-source mathematics software system.
 authors:
 - name: "The SageMath Developers"
-version: 10.2
+version: 10.3.beta0
 doi: 10.5281/zenodo.593563
-date-released: 2023-12-03
+date-released: 2023-12-05
 repository-code: "https://github.com/sagemath/sage"
 url: "https://www.sagemath.org/"
diff --git a/VERSION.txt b/VERSION.txt
index 274290e658a..75f3e554fbb 100644
--- a/VERSION.txt
+++ b/VERSION.txt
@@ -1 +1 @@
-SageMath version 10.2, Release Date: 2023-12-03
+SageMath version 10.3.beta0, Release Date: 2023-12-05
diff --git a/build/pkgs/configure/checksums.ini b/build/pkgs/configure/checksums.ini
index 9d9a932630e..6fab326e890 100644
--- a/build/pkgs/configure/checksums.ini
+++ b/build/pkgs/configure/checksums.ini
@@ -1,4 +1,4 @@
 tarball=configure-VERSION.tar.gz
-sha1=09ed008d1bdba4837fdb078f8f50a67cac9a9d7f
-md5=eeed6bf17634e46f99f44c1f8dcd010a
-cksum=1753047461
+sha1=cba1a107f45084e1884ca8a873504c70eec9c16c
+md5=b61e77023581c8994c73313e867a6c26
+cksum=615928275
diff --git a/build/pkgs/configure/package-version.txt b/build/pkgs/configure/package-version.txt
index 61f7a9c7ecd..d124c289596 100644
--- a/build/pkgs/configure/package-version.txt
+++ b/build/pkgs/configure/package-version.txt
@@ -1 +1 @@
-c3f06e4734ef325db812d73dcdb2bf846b590104
+9b1e18ffc022a8ed0e7451ccf190a009ceb2d81c
diff --git a/build/pkgs/sage_conf/install-requires.txt b/build/pkgs/sage_conf/install-requires.txt
index 8eb5ae88a85..38ec7e2cd5d 100644
--- a/build/pkgs/sage_conf/install-requires.txt
+++ b/build/pkgs/sage_conf/install-requires.txt
@@ -1,2 +1,2 @@
 # This file is updated on every release by the sage-update-version script
-sage-conf ~= 10.2
+sage-conf ~= 10.3b0
diff --git a/build/pkgs/sage_docbuild/install-requires.txt b/build/pkgs/sage_docbuild/install-requires.txt
index ff18a74200a..3769c7054e8 100644
--- a/build/pkgs/sage_docbuild/install-requires.txt
+++ b/build/pkgs/sage_docbuild/install-requires.txt
@@ -1,2 +1,2 @@
 # This file is updated on every release by the sage-update-version script
-sage-docbuild ~= 10.2
+sage-docbuild ~= 10.3b0
diff --git a/build/pkgs/sage_setup/install-requires.txt b/build/pkgs/sage_setup/install-requires.txt
index eb6834048e1..0913b873634 100644
--- a/build/pkgs/sage_setup/install-requires.txt
+++ b/build/pkgs/sage_setup/install-requires.txt
@@ -1,2 +1,2 @@
 # This file is updated on every release by the sage-update-version script
-sage-setup ~= 10.2
+sage-setup ~= 10.3b0
diff --git a/build/pkgs/sage_sws2rst/install-requires.txt b/build/pkgs/sage_sws2rst/install-requires.txt
index 5cc98378a84..8e3570a99d3 100644
--- a/build/pkgs/sage_sws2rst/install-requires.txt
+++ b/build/pkgs/sage_sws2rst/install-requires.txt
@@ -1,2 +1,2 @@
 # This file is updated on every release by the sage-update-version script
-sage-sws2rst ~= 10.2
+sage-sws2rst ~= 10.3b0
diff --git a/build/pkgs/sagelib/install-requires.txt b/build/pkgs/sagelib/install-requires.txt
index 8609e43c636..307a02db545 100644
--- a/build/pkgs/sagelib/install-requires.txt
+++ b/build/pkgs/sagelib/install-requires.txt
@@ -1,2 +1,2 @@
 # This file is updated on every release by the sage-update-version script
-sagemath-standard ~= 10.2
+sagemath-standard ~= 10.3b0
diff --git a/build/pkgs/sagemath_bliss/install-requires.txt b/build/pkgs/sagemath_bliss/install-requires.txt
index cd1c51681dc..b340ea27044 100644
--- a/build/pkgs/sagemath_bliss/install-requires.txt
+++ b/build/pkgs/sagemath_bliss/install-requires.txt
@@ -1,2 +1,2 @@
 # This file is updated on every release by the sage-update-version script
-sagemath-bliss ~= 10.2
+sagemath-bliss ~= 10.3b0
diff --git a/build/pkgs/sagemath_categories/install-requires.txt b/build/pkgs/sagemath_categories/install-requires.txt
index 017b3d374b0..9019a793f10 100644
--- a/build/pkgs/sagemath_categories/install-requires.txt
+++ b/build/pkgs/sagemath_categories/install-requires.txt
@@ -1,2 +1,2 @@
 # This file is updated on every release by the sage-update-version script
-sagemath-categories ~= 10.2
+sagemath-categories ~= 10.3b0
diff --git a/build/pkgs/sagemath_coxeter3/install-requires.txt b/build/pkgs/sagemath_coxeter3/install-requires.txt
index 40569f233fc..e57fd056654 100644
--- a/build/pkgs/sagemath_coxeter3/install-requires.txt
+++ b/build/pkgs/sagemath_coxeter3/install-requires.txt
@@ -1,2 +1,2 @@
 # This file is updated on every release by the sage-update-version script
-sagemath-coxeter3 ~= 10.2
+sagemath-coxeter3 ~= 10.3b0
diff --git a/build/pkgs/sagemath_environment/install-requires.txt b/build/pkgs/sagemath_environment/install-requires.txt
index a1f32f6bc98..9202789d78a 100644
--- a/build/pkgs/sagemath_environment/install-requires.txt
+++ b/build/pkgs/sagemath_environment/install-requires.txt
@@ -1,2 +1,2 @@
 # This file is updated on every release by the sage-update-version script
-sagemath-environment ~= 10.2
+sagemath-environment ~= 10.3b0
diff --git a/build/pkgs/sagemath_mcqd/install-requires.txt b/build/pkgs/sagemath_mcqd/install-requires.txt
index 7f4164c93a1..93f176e6fc5 100644
--- a/build/pkgs/sagemath_mcqd/install-requires.txt
+++ b/build/pkgs/sagemath_mcqd/install-requires.txt
@@ -1,2 +1,2 @@
 # This file is updated on every release by the sage-update-version script
-sagemath-mcqd ~= 10.2
+sagemath-mcqd ~= 10.3b0
diff --git a/build/pkgs/sagemath_meataxe/install-requires.txt b/build/pkgs/sagemath_meataxe/install-requires.txt
index 9122afd82be..ee1e280aad1 100644
--- a/build/pkgs/sagemath_meataxe/install-requires.txt
+++ b/build/pkgs/sagemath_meataxe/install-requires.txt
@@ -1,2 +1,2 @@
 # This file is updated on every release by the sage-update-version script
-sagemath-meataxe ~= 10.2
+sagemath-meataxe ~= 10.3b0
diff --git a/build/pkgs/sagemath_objects/install-requires.txt b/build/pkgs/sagemath_objects/install-requires.txt
index a322fd5489f..07baf32ec81 100644
--- a/build/pkgs/sagemath_objects/install-requires.txt
+++ b/build/pkgs/sagemath_objects/install-requires.txt
@@ -1,2 +1,2 @@
 # This file is updated on every release by the sage-update-version script
-sagemath-objects ~= 10.2
+sagemath-objects ~= 10.3b0
diff --git a/build/pkgs/sagemath_repl/install-requires.txt b/build/pkgs/sagemath_repl/install-requires.txt
index 9c272edab74..79c7e5a7ed0 100644
--- a/build/pkgs/sagemath_repl/install-requires.txt
+++ b/build/pkgs/sagemath_repl/install-requires.txt
@@ -1,2 +1,2 @@
 # This file is updated on every release by the sage-update-version script
-sagemath-repl ~= 10.2
+sagemath-repl ~= 10.3b0
diff --git a/build/pkgs/sagemath_sirocco/install-requires.txt b/build/pkgs/sagemath_sirocco/install-requires.txt
index e7ab8fa942b..44ebb97d788 100644
--- a/build/pkgs/sagemath_sirocco/install-requires.txt
+++ b/build/pkgs/sagemath_sirocco/install-requires.txt
@@ -1,2 +1,2 @@
 # This file is updated on every release by the sage-update-version script
-sagemath-sirocco ~= 10.2
+sagemath-sirocco ~= 10.3b0
diff --git a/build/pkgs/sagemath_tdlib/install-requires.txt b/build/pkgs/sagemath_tdlib/install-requires.txt
index f717989d8c4..ea24439a16a 100644
--- a/build/pkgs/sagemath_tdlib/install-requires.txt
+++ b/build/pkgs/sagemath_tdlib/install-requires.txt
@@ -1,2 +1,2 @@
 # This file is updated on every release by the sage-update-version script
-sagemath-tdlib ~= 10.2
+sagemath-tdlib ~= 10.3b0
diff --git a/pkgs/sage-conf/VERSION.txt b/pkgs/sage-conf/VERSION.txt
index e2498ea52d3..d1741c9f234 100644
--- a/pkgs/sage-conf/VERSION.txt
+++ b/pkgs/sage-conf/VERSION.txt
@@ -1 +1 @@
-10.2
+10.3.beta0
diff --git a/pkgs/sage-conf_conda/VERSION.txt b/pkgs/sage-conf_conda/VERSION.txt
index e2498ea52d3..d1741c9f234 100644
--- a/pkgs/sage-conf_conda/VERSION.txt
+++ b/pkgs/sage-conf_conda/VERSION.txt
@@ -1 +1 @@
-10.2
+10.3.beta0
diff --git a/pkgs/sage-conf_pypi/VERSION.txt b/pkgs/sage-conf_pypi/VERSION.txt
index e2498ea52d3..d1741c9f234 100644
--- a/pkgs/sage-conf_pypi/VERSION.txt
+++ b/pkgs/sage-conf_pypi/VERSION.txt
@@ -1 +1 @@
-10.2
+10.3.beta0
diff --git a/pkgs/sage-docbuild/VERSION.txt b/pkgs/sage-docbuild/VERSION.txt
index e2498ea52d3..d1741c9f234 100644
--- a/pkgs/sage-docbuild/VERSION.txt
+++ b/pkgs/sage-docbuild/VERSION.txt
@@ -1 +1 @@
-10.2
+10.3.beta0
diff --git a/pkgs/sage-setup/VERSION.txt b/pkgs/sage-setup/VERSION.txt
index e2498ea52d3..d1741c9f234 100644
--- a/pkgs/sage-setup/VERSION.txt
+++ b/pkgs/sage-setup/VERSION.txt
@@ -1 +1 @@
-10.2
+10.3.beta0
diff --git a/pkgs/sage-sws2rst/VERSION.txt b/pkgs/sage-sws2rst/VERSION.txt
index e2498ea52d3..d1741c9f234 100644
--- a/pkgs/sage-sws2rst/VERSION.txt
+++ b/pkgs/sage-sws2rst/VERSION.txt
@@ -1 +1 @@
-10.2
+10.3.beta0
diff --git a/pkgs/sagemath-bliss/VERSION.txt b/pkgs/sagemath-bliss/VERSION.txt
index e2498ea52d3..d1741c9f234 100644
--- a/pkgs/sagemath-bliss/VERSION.txt
+++ b/pkgs/sagemath-bliss/VERSION.txt
@@ -1 +1 @@
-10.2
+10.3.beta0
diff --git a/pkgs/sagemath-categories/VERSION.txt b/pkgs/sagemath-categories/VERSION.txt
index e2498ea52d3..d1741c9f234 100644
--- a/pkgs/sagemath-categories/VERSION.txt
+++ b/pkgs/sagemath-categories/VERSION.txt
@@ -1 +1 @@
-10.2
+10.3.beta0
diff --git a/pkgs/sagemath-coxeter3/VERSION.txt b/pkgs/sagemath-coxeter3/VERSION.txt
index e2498ea52d3..d1741c9f234 100644
--- a/pkgs/sagemath-coxeter3/VERSION.txt
+++ b/pkgs/sagemath-coxeter3/VERSION.txt
@@ -1 +1 @@
-10.2
+10.3.beta0
diff --git a/pkgs/sagemath-environment/VERSION.txt b/pkgs/sagemath-environment/VERSION.txt
index e2498ea52d3..d1741c9f234 100644
--- a/pkgs/sagemath-environment/VERSION.txt
+++ b/pkgs/sagemath-environment/VERSION.txt
@@ -1 +1 @@
-10.2
+10.3.beta0
diff --git a/pkgs/sagemath-mcqd/VERSION.txt b/pkgs/sagemath-mcqd/VERSION.txt
index e2498ea52d3..d1741c9f234 100644
--- a/pkgs/sagemath-mcqd/VERSION.txt
+++ b/pkgs/sagemath-mcqd/VERSION.txt
@@ -1 +1 @@
-10.2
+10.3.beta0
diff --git a/pkgs/sagemath-meataxe/VERSION.txt b/pkgs/sagemath-meataxe/VERSION.txt
index e2498ea52d3..d1741c9f234 100644
--- a/pkgs/sagemath-meataxe/VERSION.txt
+++ b/pkgs/sagemath-meataxe/VERSION.txt
@@ -1 +1 @@
-10.2
+10.3.beta0
diff --git a/pkgs/sagemath-objects/VERSION.txt b/pkgs/sagemath-objects/VERSION.txt
index e2498ea52d3..d1741c9f234 100644
--- a/pkgs/sagemath-objects/VERSION.txt
+++ b/pkgs/sagemath-objects/VERSION.txt
@@ -1 +1 @@
-10.2
+10.3.beta0
diff --git a/pkgs/sagemath-repl/VERSION.txt b/pkgs/sagemath-repl/VERSION.txt
index e2498ea52d3..d1741c9f234 100644
--- a/pkgs/sagemath-repl/VERSION.txt
+++ b/pkgs/sagemath-repl/VERSION.txt
@@ -1 +1 @@
-10.2
+10.3.beta0
diff --git a/pkgs/sagemath-sirocco/VERSION.txt b/pkgs/sagemath-sirocco/VERSION.txt
index e2498ea52d3..d1741c9f234 100644
--- a/pkgs/sagemath-sirocco/VERSION.txt
+++ b/pkgs/sagemath-sirocco/VERSION.txt
@@ -1 +1 @@
-10.2
+10.3.beta0
diff --git a/pkgs/sagemath-tdlib/VERSION.txt b/pkgs/sagemath-tdlib/VERSION.txt
index e2498ea52d3..d1741c9f234 100644
--- a/pkgs/sagemath-tdlib/VERSION.txt
+++ b/pkgs/sagemath-tdlib/VERSION.txt
@@ -1 +1 @@
-10.2
+10.3.beta0
diff --git a/src/VERSION.txt b/src/VERSION.txt
index e2498ea52d3..d1741c9f234 100644
--- a/src/VERSION.txt
+++ b/src/VERSION.txt
@@ -1 +1 @@
-10.2
+10.3.beta0
diff --git a/src/bin/sage-version.sh b/src/bin/sage-version.sh
index 17ce1d95cd5..9f4098364dc 100644
--- a/src/bin/sage-version.sh
+++ b/src/bin/sage-version.sh
@@ -4,6 +4,6 @@
 # which stops "setup.py develop" from rewriting it as a Python file.
 :
 # This file is auto-generated by the sage-update-version script, do not edit!
-SAGE_VERSION='10.2'
-SAGE_RELEASE_DATE='2023-12-03'
-SAGE_VERSION_BANNER='SageMath version 10.2, Release Date: 2023-12-03'
+SAGE_VERSION='10.3.beta0'
+SAGE_RELEASE_DATE='2023-12-05'
+SAGE_VERSION_BANNER='SageMath version 10.3.beta0, Release Date: 2023-12-05'
diff --git a/src/sage/version.py b/src/sage/version.py
index 911aeb53f24..f7c0467ee4e 100644
--- a/src/sage/version.py
+++ b/src/sage/version.py
@@ -1,5 +1,5 @@
 # Sage version information for Python scripts
 # This file is auto-generated by the sage-update-version script, do not edit!
-version = '10.2'
-date = '2023-12-03'
-banner = 'SageMath version 10.2, Release Date: 2023-12-03'
+version = '10.3.beta0'
+date = '2023-12-05'
+banner = 'SageMath version 10.3.beta0, Release Date: 2023-12-05'