release/v5.2.0: updating version numbers (#3269)

Author: serban-nicusor-toptal

.github/ISSUE_TEMPLATE.md

@@ -25,4 +25,4 @@ If this is a **feature request**, show what you expect to happen if the feature
 
 
 #### Current Version:
-v5.1.0
+v5.2.0

RELEASE-NOTES.txt

@@ -1,5 +1,17 @@
 Stan Math Library Release Notes
 
+======================================================================
+v5.2.0 (6 January 2026)
+======================================================================
+
+ - Added the unnormalized CDF and CCDF for the wiener 7-parameter diffusion model. Allows modeling truncated and censored data. (#3042, #3258, #3260, #3263)
+ - Added `yule_simon_lpmf` and `yule_simon_lccdf`. Allows modeling power-law count data. (#3220, #3236)
+ - Updated wording of validate_positive_index. (#3248)
+ - Replaced standard `if` statements with `if constexpr` where posssible. (#3240)
+ - Removed use of `forward_as` in the math library. (#3242)
+ - Added some more type traits for dealing with tuples. (#3244)
+ - Added `inline` to all functions. (#3245)
+
 ======================================================================
 v5.1.0 (2 September 2025)
 ======================================================================

doxygen/doxygen.cfg

@@ -48,7 +48,7 @@ PROJECT_NAME           = "Stan Math Library"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 5.1.0
+PROJECT_NUMBER         = 5.2.0
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a

stan/math/version.hpp

@@ -12,7 +12,7 @@
 #endif
 
 #define STAN_MATH_MAJOR 5
-#define STAN_MATH_MINOR 1
+#define STAN_MATH_MINOR 2
 #define STAN_MATH_PATCH 0
 
 namespace stan {