diff --git a/CMakeLists.txt b/CMakeLists.txt
index ccb1cd32a..9dc368094 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,7 +16,7 @@ IF( POLICY CMP0054 )
 ENDIF( POLICY CMP0054 )
 #
 # cppad_version is used by version.sh to get the version number.
-SET(cppad_version "20231207")
+SET(cppad_version "20231223")
 SET(cppad_url          "https://coin-or.github.io/CppAD" )
 SET(cppad_description  "Differentiation of C++ Algorithms" )
 IF( NOT DEFINED CMAKE_BUILD_TYPE)
diff --git a/user_guide.xrst b/user_guide.xrst
index 7b48f6783..acffa6afb 100644
--- a/user_guide.xrst
+++ b/user_guide.xrst
@@ -11,7 +11,7 @@
    posix
 }
 
-cppad-20231207: CppAD User's Manual
+cppad-20231223: CppAD User's Manual
 ###################################
 
 .. image:: {xrst_dir coin.png}