diff --git a/CMakeLists.txt b/CMakeLists.txt
index 99d17f564f40..d3bfc048ea20 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -105,6 +105,9 @@ INSTALL_BUILD_STATS_SCRIPTS()
 # Install TriBITS so that other projects can use it
 include(SetupTribitsInstall)
 
+# See https://tribitspub.github.io/TriBITS/users_guide/index.html#project-name-must-find-all-tpl-libs
+SET(Trilinos_MUST_FIND_ALL_TPL_LIBS_DEFAULT TRUE)
+
 IF(${PROJECT_NAME}_ENABLE_YouCompleteMe)
   INCLUDE(CodeCompletion)
 ENDIF()
diff --git a/RELEASE_NOTES b/RELEASE_NOTES
index 0e25fb33c57d..a2c747e5b46a 100644
--- a/RELEASE_NOTES
+++ b/RELEASE_NOTES
@@ -1,4 +1,21 @@
 
+###############################################################################
+#                                                                             #
+# Trilinos Release 15.0 Release Notes                                         #
+#                                                                             #
+###############################################################################
+
+CMake
+
+  - Change the default for `Trilinos_MUST_FIND_ALL_TPL_LIBS` from `OFF` to
+    `ON`, by setting `Trilinos_MUST_FIND_ALL_TPL_LIBS_DEFAULT` to `ON`. It was
+    turned off by default because it breaks backward compatibility but it also
+    causes problems for new users and new configurations.
+
+    Users that do not want this new behavior can set
+    `-D Trilinos_MUST_FIND_ALL_TPL_LIBS=OFF`, which is backward compatible.
+
+
 ###############################################################################
 #                                                                             #
 # Trilinos Release 14.2 Release Notes                                         #