diff --git a/META.json b/META.json
index d35bc13b0708..e6e6effe85c1 100644
--- a/META.json
+++ b/META.json
@@ -120,5 +120,5 @@
       }
    },
    "version" : "5.037005",
-   "x_serialization_backend" : "JSON::PP version 4.11"
+   "x_serialization_backend" : "JSON::PP version 4.12"
 }
diff --git a/Porting/Maintainers.pl b/Porting/Maintainers.pl
index 540a1fabd95b..c21468bd1406 100755
--- a/Porting/Maintainers.pl
+++ b/Porting/Maintainers.pl
@@ -683,7 +683,7 @@ package Maintainers;
     },
 
     'JSON::PP' => {
-        'DISTRIBUTION' => 'ISHIGAKI/JSON-PP-4.11.tar.gz',
+        'DISTRIBUTION' => 'ISHIGAKI/JSON-PP-4.12.tar.gz',
         'FILES'        => q[cpan/JSON-PP],
     },
 
diff --git a/cpan/JSON-PP/lib/JSON/PP.pm b/cpan/JSON-PP/lib/JSON/PP.pm
index 2a8b55a76366..732c5339d113 100644
--- a/cpan/JSON-PP/lib/JSON/PP.pm
+++ b/cpan/JSON-PP/lib/JSON/PP.pm
@@ -14,7 +14,7 @@ use JSON::PP::Boolean;
 use Carp ();
 #use Devel::Peek;
 
-$JSON::PP::VERSION = '4.11';
+$JSON::PP::VERSION = '4.12';
 
 @JSON::PP::EXPORT = qw(encode_json decode_json from_json to_json);
 
diff --git a/cpan/JSON-PP/lib/JSON/PP/Boolean.pm b/cpan/JSON-PP/lib/JSON/PP/Boolean.pm
index 08fec556a441..66f7e516fbca 100644
--- a/cpan/JSON-PP/lib/JSON/PP/Boolean.pm
+++ b/cpan/JSON-PP/lib/JSON/PP/Boolean.pm
@@ -3,6 +3,7 @@ package JSON::PP::Boolean;
 use strict;
 require overload;
 local $^W;
+overload::unimport('overload', qw(0+ ++ -- fallback));
 overload::import('overload',
     "0+"     => sub { ${$_[0]} },
     "++"     => sub { $_[0] = ${$_[0]} + 1 },
@@ -10,7 +11,7 @@ overload::import('overload',
     fallback => 1,
 );
 
-$JSON::PP::Boolean::VERSION = '4.11';
+$JSON::PP::Boolean::VERSION = '4.12';
 
 1;