diff --git a/gen/kerberos_renewal_principals b/gen/kerberos_renewal_principals
index b92c392b..41107faa 100755
--- a/gen/kerberos_renewal_principals
+++ b/gen/kerberos_renewal_principals
@@ -7,7 +7,7 @@ use perunServicesUtils;
 use File::Basename;
 
 local $::SERVICE_NAME = basename($0);
-local $::PROTOCOL_VERSION = "3.0.0";
+local $::PROTOCOL_VERSION = "3.1.0";
 my $SCRIPT_VERSION = "3.0.1";
 
 perunServicesInit::init;
diff --git a/slave/process-kerberos-renewal-principals/bin/process-kerberos_renewal_principals.sh b/slave/process-kerberos-renewal-principals/bin/process-kerberos_renewal_principals.sh
index 61139530..450c950a 100755
--- a/slave/process-kerberos-renewal-principals/bin/process-kerberos_renewal_principals.sh
+++ b/slave/process-kerberos-renewal-principals/bin/process-kerberos_renewal_principals.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
-PROTOCOL_VERSION='3.0.0'
+PROTOCOL_VERSION='3.1.0'
 
 function process {