diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index 72404dba4..4de5a710c 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -6,7 +6,7 @@ jobs:
   build:
 
     env:
-      PACKAGE: sdformat14
+      PACKAGE: sdformat15
     runs-on: macos-latest
     steps:
     - uses: actions/checkout@v3
diff --git a/CMakeLists.txt b/CMakeLists.txt
index f18d73f91..6ae37bad4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,7 +5,7 @@ if(COMMAND CMAKE_POLICY)
   CMAKE_POLICY(SET CMP0004 NEW)
 endif(COMMAND CMAKE_POLICY)
 
-project (sdformat14 VERSION 14.1.1)
+project (sdformat15 VERSION 15.0.0)
 
 # The protocol version has nothing to do with the package version.
 # It represents the current version of SDFormat implemented by the software
diff --git a/Changelog.md b/Changelog.md
index c41c7af4e..3216b1855 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,3 +1,7 @@
+## libsdformat 15.X
+
+### libsdformat 15.X.X (202X-XX-XX)
+
 ## libsdformat 14.X
 
 ### libsdformat 14.1.1 (2024-03-28)
diff --git a/README.md b/README.md
index 4a8a8cf60..793254d4c 100644
--- a/README.md
+++ b/README.md
@@ -114,7 +114,7 @@ conda install libsdformat=12.5.0 --channel conda-forge
 ## Source Installation
 
 
-**Note:** the `main` branch is under development for `libsdformat14` and is
+**Note:** the `main` branch is under development for `libsdformat15` and is
 currently unstable. A release branch (`sdf12`, `sdf11`, `sdf10`, `sdf9`, etc.)
 is recommended for most users.
 
diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
index 7541a5de6..d191c1b0a 100644
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.10.2 FATAL_ERROR)
 
-find_package(sdformat14 REQUIRED)
+find_package(sdformat15 REQUIRED)
 
 set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17")
 
diff --git a/python/test/gz_test_deps/sdformat.py b/python/test/gz_test_deps/sdformat.py
index 51cec2889..5d34df703 100644
--- a/python/test/gz_test_deps/sdformat.py
+++ b/python/test/gz_test_deps/sdformat.py
@@ -1 +1 @@
-from sdformat14 import *
+from sdformat15 import *