diff --git a/CMakeLists.txt b/CMakeLists.txt
index aa5d51b7a7..7f658657a4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -19,7 +19,7 @@ include(CMakeDependentOption)
 # Set version number
 set(RAJA_VERSION_MAJOR 2025)
 set(RAJA_VERSION_MINOR 12)
-set(RAJA_VERSION_PATCHLEVEL 0)
+set(RAJA_VERSION_PATCHLEVEL 1)
 
 if (RAJA_LOADED AND (NOT RAJA_LOADED STREQUAL "${RAJA_VERSION_MAJOR}.${RAJA_VERSION_MINOR}.${RAJA_VERSION_PATCHLEVEL}"))
   message(FATAL_ERROR "You are mixing RAJA versions. Loaded is ${RAJA_LOADED}, expected ${RAJA_VERSION_MAJOR}.${RAJA_VERSION_MINOR}.${RAJA_VERSION_PATCHLEVEL}")
diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index 3e06c68373..bbe27753c9 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -21,19 +21,26 @@ Notable changes include:
   * Bug fixes/improvements:
 
 
-Version 2025.MM.PP -- Release date 2025-mm-dd
-=============================================
+Version 2025.12.1 -- Release date 2026-01-28
+============================================
 
-This release contains ...
+This release contains some improvements to code robustness, including
+evolving internal code implementations to use C++17, and eventually C++20.
 
 Notable changes include:
 
   * New features / API changes:
+    * Add Kahan sum class used in RAJAPerf to make parallel sum reductions
+      more accurate. Note that using fast-math compiler option (default with the
+      Intel compiler) will undo the accuracy increase. To recover the accuracy
+      with the Intel compiler, use the '-fp-model=precise' option. 
 
   * Build changes/improvements:
     * Bump minimum CMake version required to 3.24.
 
   * Bug fixes/improvements:
+    * Various internal code cleanups, simplifications, and improvements using
+      C++17 features, with an eye toward C++20.
 
 
 Version 2025.12.0 -- Release date 2025-12-19
diff --git a/docs/conf.py b/docs/conf.py
index 859e4d8c81..f517def7f3 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -89,7 +89,7 @@
 # The short X.Y version.
 version = u'2025.12'
 # The full version, including alpha/beta/rc tags.
-release = u'2025.12.0'
+release = u'2025.12.1'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.