diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9b94d9fa6..eb6589bbd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3365,13 +3365,17 @@ if(ENABLE_ION)
     if(EXISTS ${GNSSSDR_BINARY_DIR}/thirdparty/gnss-metadata-standard/CMakeLists.txt)
         set(ION_METADATA_PATCH_COMMAND "")
     endif()
+    set(NO_WARNING_FLAGS "")
+    if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang" AND NOT WIN32)
+        set(NO_WARNING_FLAGS "-DCMAKE_CXX_FLAGS_INIT=-w" "-DCMAKE_C_FLAGS_INIT=-w")
+    endif()
     FetchContent_Declare(
         gnss_metadata_standard
         GIT_REPOSITORY https://github.com/IonMetadataWorkingGroup/GNSS-Metadata-Standard
         GIT_TAG 220d116e10db5e403e21b77a1fa25aa35feda198
         SOURCE_DIR ${GNSSSDR_BINARY_DIR}/thirdparty/gnss-metadata-standard
         PATCH_COMMAND ${ION_METADATA_PATCH_COMMAND}
-        CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${GNSSSDR_BINARY_DIR}/gnss-metadata-standard
+        CMAKE_ARGS ${NO_WARNING_FLAGS} -DCMAKE_INSTALL_PREFIX=${GNSSSDR_BINARY_DIR}/gnss-metadata-standard
         BINARY_DIR ${GNSSSDR_BINARY_DIR}/gnss-metadata-standard
     )
     FetchContent_MakeAvailable(gnss_metadata_standard)
diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index ced11996d..c8d6a477f 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -21,6 +21,15 @@ All notable changes to GNSS-SDR will be documented in this file.
   warning).
 - Added formatting of `.proto` files with clang-format. Added check in CI job.
 
+### Improvements in Portability:
+
+- Fix building option `-DENABLE_ION=ON` when using CMake >= 4.0.
+
+See the definitions of concepts and metrics at
+https://gnss-sdr.org/design-forces/
+
+ 
+
 ## [GNSS-SDR v0.0.20](https://github.com/gnss-sdr/gnss-sdr/releases/tag/v0.0.20) - 2025-04-01
 
 [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.15126929.svg)](https://doi.org/10.5281/zenodo.15126929)
diff --git a/tests/data/ion_gnss_standard_cmake.patch b/tests/data/ion_gnss_standard_cmake.patch
index d484bcad7..da8532ad8 100644
--- a/tests/data/ion_gnss_standard_cmake.patch
+++ b/tests/data/ion_gnss_standard_cmake.patch
@@ -7,7 +7,7 @@ SPDX-FileCopyrightText: 2025 Carles Fernandez-Prades <carles.fernandez@cttc.es>
  endif(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_BINARY_DIR})
  
 -cmake_minimum_required(VERSION 2.8)
-+cmake_minimum_required(VERSION 2.8.12...3.5)
++cmake_minimum_required(VERSION 2.8.12...3.10)
  project(GNSS_METADATA_STANDARD CXX C)
  
  file(RELATIVE_PATH RELATIVE_CMAKE_CALL ${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR})