diff --git a/.gitignore b/.gitignore
index c93dc55..738baaa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -21,3 +21,4 @@ ipv6calc-0.73.0.tar.gz
 /ipv6calc-0.99.1-2016-02-03.patch
 /ipv6calc-0.99.1-2016-02-04.patch
 /ipv6calc-0.99.2.tar.gz
+/ipv6calc-1.0.0.tar.gz
diff --git a/ipv6calc.spec b/ipv6calc.spec
index 53d3aab..8169721 100644
--- a/ipv6calc.spec
+++ b/ipv6calc.spec
@@ -29,6 +29,7 @@ BuildRequires:	openssl-devel
 BuildRequires:	perl-generators
 BuildRequires:	perl(Digest::MD5), perl(Digest::SHA1), perl(URI::Escape)
 BuildRequires:	perl(strict), perl(warnings)
+BuildRequires:	procps-ng
 Requires:	perl(:MODULE_COMPAT_%(eval "`%{__perl} -V:version`"; echo $version))
 %if %{enable_shared}
 Provides:	ipv6calc-libs = %{version}-%{release}}
@@ -319,6 +320,10 @@ rm -rf %{buildroot}
 
 
 %changelog
+* Sun Jun 25 2017 Peter Bieringer <pb@bieringer.de> - 1.0.0-20
+- new release 1.0.0
+- add missing build requirement procps-ng
+
 * Wed Dec 28 2016 Peter Bieringer <pb@bieringer.de> - 0.99.2-17
 - new release 0.99.2
 - add support for git commit hash
diff --git a/sources b/sources
index 0ef667b..1ed6b00 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (ipv6calc-0.99.2.tar.gz) = f757a4a7d69b5dea34051125b96b9f9f36957bfabb1568ddae2aaefe6551aac7b9edb6abfdb3ac90aeaf32e517720157614cb7552b4e9dc18180904674e48f09
+SHA512 (ipv6calc-1.0.0.tar.gz) = 46e33697551c4bf0a472c7f2dd51c11ae21d49c7d78fe5213bce60c1d11f9230491c328e425f36733c7262a369644bcedb8392ffe2279031eb2552092a5ac209