diff --git a/perl-YAML-LibYAML.spec b/perl-YAML-LibYAML.spec
index 5b16b80..fbded62 100644
--- a/perl-YAML-LibYAML.spec
+++ b/perl-YAML-LibYAML.spec
@@ -1,7 +1,7 @@
 Name:           perl-YAML-LibYAML
 Epoch:          1
-Version:        0.65
-Release:        4%{?dist}
+Version:        0.66
+Release:        1%{?dist}
 Summary:        Perl YAML Serialization using XS and libyaml
 License:        GPL+ or Artistic
 URL:            http://search.cpan.org/dist/YAML-LibYAML/
@@ -12,9 +12,9 @@ BuildRequires:  coreutils
 BuildRequires:  findutils
 BuildRequires:  gcc
 BuildRequires:  make
-BuildRequires:  perl-interpreter
 BuildRequires:  perl-devel
 BuildRequires:  perl-generators
+BuildRequires:  perl-interpreter
 BuildRequires:  perl(Config)
 BuildRequires:  perl(ExtUtils::MakeMaker)
 
@@ -29,6 +29,7 @@ BuildRequires:  perl(warnings)
 BuildRequires:  perl(XSLoader)
 
 # Tests
+BuildRequires:  perl(B)
 BuildRequires:  perl(blib)
 BuildRequires:  perl(Carp)
 BuildRequires:  perl(Data::Dumper)
@@ -94,6 +95,10 @@ make test
 %{_mandir}/man3/YAML::XS::LibYAML.3*
 
 %changelog
+* Fri Aug 18 2017 Paul Howarth <paul@city-fan.org> - 1:0.66-1
+- Update to 0.66
+  - Dump() was modifying original data, adding a PV to numbers (GH#32, GH#55)
+
 * Thu Aug 03 2017 Fedora Release Engineering <releng@fedoraproject.org> - 1:0.65-4
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_27_Binutils_Mass_Rebuild
 
diff --git a/sources b/sources
index 02e2df0..616d411 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (YAML-LibYAML-0.65.tar.gz) = 87998f9d8458476168c06e984696ac562e77f6cfc252c57a8159bb45353bacab7fa159c983275f08fcd54479d7a994feebc2568f51b564d685d99cc66ee87cf0
+SHA512 (YAML-LibYAML-0.66.tar.gz) = 327dd49215a6e43f64c2f09a8efd79698f544e9c4ef4a45ae708d5810fbb6019815c27c715cea35158faf32d0c6b55656547ca9a4a232fdb80afb3d2cd9a6967