Bump Meridian to v1.5.1

PiperOrigin-RevId: 865669613

Author: ronellecaguioa

CHANGELOG.md

@@ -23,9 +23,11 @@ To release a new version (e.g. from `1.0.0` -> `2.0.0`):
 
 ## [Unreleased]
 
+## [1.5.1] - 2026-02-04
+
 * Fix serialization for binary and text files.
 
-## [1.5.0] - 2026-01-26
+## [1.5.0] - 2026-01-27
 
 * Remove dependency on the unmaintained `patsy` library.
 * Add interactive zooming to prior-posterior distribution plots.
@@ -442,4 +444,5 @@ To release a new version (e.g. from `1.0.0` -> `2.0.0`):
 [1.3.2]: https://github.com/google/meridian/releases/tag/v1.3.2
 [1.4.0]: https://github.com/google/meridian/releases/tag/v1.4.0
 [1.5.0]: https://github.com/google/meridian/releases/tag/v1.5.0
-[Unreleased]: https://github.com/google/meridian/compare/v1.5.0...HEAD
+[1.5.1]: https://github.com/google/meridian/releases/tag/v1.5.1
+[Unreleased]: https://github.com/google/meridian/compare/v1.5.1...HEAD

README.md

@@ -153,7 +153,7 @@ To cite this repository:
   author = {Google Meridian Marketing Mix Modeling Team},
   title = {Meridian: Marketing Mix Modeling},
   url = {https://github.com/google/meridian},
-  version = {1.5.0},
+  version = {1.5.1},
   year = {2025},
 }
 ```

meridian/version.py

@@ -14,4 +14,4 @@
 
 """Module for Meridian version."""
 
-__version__ = "1.5.0"
+__version__ = "1.5.1"