diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0f3e5a381..b5a3987ab 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -341,7 +341,7 @@ set(GNSSSDR_GNSS_SIM_LOCAL_VERSION "master")
 set(GNSSSDR_GNSSTK_LOCAL_VERSION "13.4.0")
 set(GNSSSDR_MATIO_LOCAL_VERSION "1.5.23")
 set(GNSSSDR_PUGIXML_LOCAL_VERSION "1.12")
-set(GNSSSDR_PROTOCOLBUFFERS_LOCAL_VERSION "21.3")
+set(GNSSSDR_PROTOCOLBUFFERS_LOCAL_VERSION "21.4")
 set(GNSSSDR_BENCHMARK_LOCAL_VERSION "1.6.2")
 set(GNSSSDR_MATHJAX_EXTERNAL_VERSION "2.7.7")