diff --git a/libphonenumber.spec b/libphonenumber.spec
index bd5e94e..3a25678 100644
--- a/libphonenumber.spec
+++ b/libphonenumber.spec
@@ -1,6 +1,6 @@
 Name:          libphonenumber
 Version:       8.12.48
-Release:       1mamba
+Release:       2mamba
 Summary:       Google's common Java, C++ and JavaScript library for parsing, formatting, and validating international phone numbers
 Group:         System/Libraries
 Vendor:        openmamba
@@ -19,7 +19,7 @@ BuildRequires: libicu-devel
 BuildRequires: libprotobuf-devel
 BuildRequires: libstdc++6-devel
 ## AUTOBUILDREQ-END
-BuildRequires: libprotobuf-devel >= 3.17.0
+BuildRequires: libprotobuf-devel >= 3.20.1
 
 %description
 Google's common Java, C++ and JavaScript library for parsing, formatting, and validating international phone numbers.
@@ -72,6 +72,9 @@ This package contains libraries and header files for developing applications tha
 %doc README.md
 
 %changelog
+* Sun May 15 2022 Silvan Calarco <silvan.calarco@mambasoft.it> 8.12.48-2mamba
+- rebuilt with libprotobuf 3.20.1
+
 * Sat May 07 2022 Automatic Build System <autodist@mambasoft.it> 8.12.48-1mamba
 - automatic version update by autodist