diff --git a/cmake/templates/HPXConfig.cmake.in b/cmake/templates/HPXConfig.cmake.in
index 257e52a1415f..5c2b68ba7052 100644
--- a/cmake/templates/HPXConfig.cmake.in
+++ b/cmake/templates/HPXConfig.cmake.in
@@ -32,7 +32,7 @@ endif()
 # find_package.
 if(HPX_COMMAND_LINE_HANDLING_WITH_JSON_CONFIGURATION_FILES)
   if(HPX_WITH_FETCH_JSON)
-    include("${CMAKE_CURRENT_LIST_DIR}/HPXJSONTarget.cmake")
+    include("${CMAKE_CURRENT_LIST_DIR}/HPXJsonTarget.cmake")
   else()
     set(HPX_JSON_ROOT "@Json_ROOT@")
     include(HPX_SetupJSON)
diff --git a/docs/sphinx/releases/whats_new_1_10_0.rst b/docs/sphinx/releases/whats_new_1_10_0.rst
index c8e5d6dad820..38ed581aa559 100644
--- a/docs/sphinx/releases/whats_new_1_10_0.rst
+++ b/docs/sphinx/releases/whats_new_1_10_0.rst
@@ -1,4 +1,4 @@
-..
+..
     Copyright (C) 2007-2023 Hartmut Kaiser
 
     SPDX-License-Identifier: BSL-1.0
@@ -17,9 +17,11 @@ General changes
 Breaking changes
 ================
 
-- The CMake configuration keys ``SOMELIB_ROOT`` (e.g., ``BOOST_ROOT``) has been
+- The |cmake| configuration keys ``SOMELIB_ROOT`` (e.g., ``BOOST_ROOT``) have been
   renamed to ``Somelib_ROOT`` (e.g., ``Boost_ROOT``) to avoid warnings when using
-  newer versions of CMake. Please update your scripts accordingly.
+  newer versions of |cmake|. Please update your scripts accordingly. For now, the
+  old variable names are re-assigned to the new names and unset in the |cmake|
+  cache.
 
 Closed issues
 =============
diff --git a/libs/core/command_line_handling_local/CMakeLists.txt b/libs/core/command_line_handling_local/CMakeLists.txt
index b46c96205e01..51d744771110 100644
--- a/libs/core/command_line_handling_local/CMakeLists.txt
+++ b/libs/core/command_line_handling_local/CMakeLists.txt
@@ -39,7 +39,7 @@ set(command_line_handling_local_sources
 
 if(HPX_COMMAND_LINE_HANDLING_WITH_JSON_CONFIGURATION_FILES)
   include(HPX_SetupJSON)
-  set(command_line_handling_local_dependencies JSON::json)
+  set(command_line_handling_local_dependencies Json::json)
 
   set(command_line_handling_local_headers
       ${command_line_handling_local_headers}
diff --git a/libs/core/command_line_handling_local/cmake/HPX_SetupJSON.cmake b/libs/core/command_line_handling_local/cmake/HPX_SetupJSON.cmake
index 119cb8eb07e3..faf92256426e 100644
--- a/libs/core/command_line_handling_local/cmake/HPX_SetupJSON.cmake
+++ b/libs/core/command_line_handling_local/cmake/HPX_SetupJSON.cmake
@@ -15,7 +15,7 @@ endif()
 
 if(NOT HPX_WITH_FETCH_JSON)
   find_package(nlohmann_json 3.2.0 REQUIRED)
-elseif(NOT TARGET JSON::json)
+elseif(NOT TARGET Json::json)
   if(NOT HPX_WITH_JSON_TAG)
     set(HPX_WITH_JSON_TAG "v3.11.2")
   endif()
@@ -26,7 +26,7 @@ elseif(NOT TARGET JSON::json)
     )
   else()
     hpx_info(
-      "HPX_WITH_FETCH_JSON=${HPX_WITH_FETCH_JSON}, JSON will be fetched using CMake's FetchContent and installed alongside HPX (HPX_WITH_Json_TAG=${HPX_WITH_Json_TAG})"
+      "HPX_WITH_FETCH_JSON=${HPX_WITH_FETCH_JSON}, JSON will be fetched using CMake's FetchContent and installed alongside HPX (HPX_WITH_JSON_TAG=${HPX_WITH_JSON_TAG})"
     )
   endif()
 
@@ -45,11 +45,11 @@ elseif(NOT TARGET JSON::json)
     json SYSTEM INTERFACE $<BUILD_INTERFACE:${Json_ROOT}/include>
                           $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
   )
-  target_compile_definitions(json INTERFACE Json_HAS_CPP_17)
+  target_compile_definitions(json INTERFACE JSON_HAS_CPP_17)
 
   install(
     TARGETS json
-    EXPORT HPXJSONTarget
+    EXPORT HPXJsonTarget
     COMPONENT core
   )
 
@@ -63,17 +63,17 @@ elseif(NOT TARGET JSON::json)
 
   export(
     TARGETS json
-    NAMESPACE JSON::
-    FILE "${CMAKE_BINARY_DIR}/lib/cmake/${HPX_PACKAGE_NAME}/HPXJSONTarget.cmake"
+    NAMESPACE Json::
+    FILE "${CMAKE_BINARY_DIR}/lib/cmake/${HPX_PACKAGE_NAME}/HPXJsonTarget.cmake"
   )
 
   install(
-    EXPORT HPXJSONTarget
-    NAMESPACE JSON::
-    FILE HPXJSONTarget.cmake
+    EXPORT HPXJsonTarget
+    NAMESPACE Json::
+    FILE HPXJsonTarget.cmake
     DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${HPX_PACKAGE_NAME}
     COMPONENT cmake
   )
 
-  add_library(JSON::json ALIAS json)
+  add_library(Json::json ALIAS json)
 endif()