diff --git a/.gitignore b/.gitignore
index 3f6cead..38f85ca 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 /lightstep-tracer-go-0.16.0.tar.gz
+/lightstep-tracer-go-0.20.0.tar.gz
diff --git a/0001-Convert-id-to-string-using-strconv.Itoa.patch b/0001-Convert-id-to-string-using-strconv.Itoa.patch
new file mode 100644
index 0000000..54d7e08
--- /dev/null
+++ b/0001-Convert-id-to-string-using-strconv.Itoa.patch
@@ -0,0 +1,41 @@
+From 8e6b0d152fc26813c2ae7916624f51c139b06bc1 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Robert-Andr=C3=A9=20Mauchin?= <zebob.m@gmail.com>
+Date: Wed, 29 Jul 2020 01:31:49 +0200
+Subject: [PATCH] Convert id to string using strconv.Itoa
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+See https://github.com/golang/go/issues/32479
+
+Fix #257.
+
+Signed-off-by: Robert-André Mauchin <zebob.m@gmail.com>
+---
+ test_utils_test.go | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/test_utils_test.go b/test_utils_test.go
+index 0e1b824..7d59e24 100644
+--- a/test_utils_test.go
++++ b/test_utils_test.go
+@@ -4,6 +4,7 @@ import (
+ 	"context"
+ 	"fmt"
+ 	"reflect"
++    "strconv"
+ 
+ 	"github.com/lightstep/lightstep-tracer-common/golang/gogo/collectorpb"
+ 	cpbfakes "github.com/lightstep/lightstep-tracer-common/golang/gogo/collectorpb/collectorpbfakes"
+@@ -24,7 +25,7 @@ func closeTestTracer(tracer opentracing.Tracer) {
+ 
+ func startNSpans(n int, tracer opentracing.Tracer) {
+ 	for i := 0; i < n; i++ {
+-		tracer.StartSpan(string(i)).Finish()
++		tracer.StartSpan(strconv.Itoa(i)).Finish()
+ 	}
+ }
+ 
+-- 
+2.26.2
+
diff --git a/golang-github-lightstep-tracer.spec b/golang-github-lightstep-tracer.spec
index c9766a4..4f0473b 100644
--- a/golang-github-lightstep-tracer.spec
+++ b/golang-github-lightstep-tracer.spec
@@ -6,7 +6,7 @@
 
 # https://github.com/lightstep/lightstep-tracer-go
 %global goipath         github.com/lightstep/lightstep-tracer-go
-Version:                0.16.0
+Version:                0.20.0
 
 %gometa
 
@@ -17,20 +17,27 @@ Package Lightstep implements the LightStep OpenTracing client for Go.}
 %global godocs          examples CHANGELOG.md README.md
 
 Name:           %{goname}
-Release:        4%{?dist}
+Release:        1%{?dist}
 Summary:        LightStep distributed tracing library for Go
 
 License:        MIT
 URL:            %{gourl}
 Source0:        %{gosource}
+# Go 1.15: https://github.com/lightstep/lightstep-tracer-go/issues/257
+Patch0:         0001-Convert-id-to-string-using-strconv.Itoa.patch
 
 BuildRequires:  golang(github.com/gogo/protobuf/proto)
 BuildRequires:  golang(github.com/gogo/protobuf/types)
 BuildRequires:  golang(github.com/lightstep/lightstep-tracer-common/golang/gogo/collectorpb)
 BuildRequires:  golang(github.com/lightstep/lightstep-tracer-common/golang/gogo/lightsteppb)
+BuildRequires:  golang(github.com/lightstep/lightstep-tracer-common/golang/gogo/metricspb)
 BuildRequires:  golang(github.com/opentracing/opentracing-go)
 BuildRequires:  golang(github.com/opentracing/opentracing-go/ext)
 BuildRequires:  golang(github.com/opentracing/opentracing-go/log)
+BuildRequires:  golang(github.com/shirou/gopsutil/cpu)
+BuildRequires:  golang(github.com/shirou/gopsutil/mem)
+BuildRequires:  golang(github.com/shirou/gopsutil/net)
+BuildRequires:  golang(github.com/shirou/gopsutil/process)
 BuildRequires:  golang(go.opencensus.io/trace)
 BuildRequires:  golang(google.golang.org/grpc)
 BuildRequires:  golang(google.golang.org/grpc/credentials)
@@ -50,6 +57,7 @@ BuildRequires:  golang(github.com/onsi/gomega)
 
 %prep
 %goprep
+%patch -p1
 
 %install
 %gopkginstall
@@ -62,6 +70,9 @@ BuildRequires:  golang(github.com/onsi/gomega)
 %gopkgfiles
 
 %changelog
+* Tue Jul 28 22:32:31 CEST 2020 Robert-André Mauchin <zebob.m@gmail.com> - 0.20.0-1
+- Update to 0.20.0
+
 * Mon Jul 27 2020 Fedora Release Engineering <releng@fedoraproject.org> - 0.16.0-4
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild
 
diff --git a/sources b/sources
index 350ddc9..8dcf243 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (lightstep-tracer-go-0.16.0.tar.gz) = 041cf770cbfcea6daa19deb7f26606a43231e9e9faf9a97f977007492ffd32455df4b14ba79452e04fe8b9fd22e89c367c5ca1cce3068a099dd261b27a9cbfdb
+SHA512 (lightstep-tracer-go-0.20.0.tar.gz) = 4028953f109f30254d8040766354e950a50f9f440be245e71744dc18111668a27e94d69a5a96102a4d96d82ac11750956fd17e3ee8138f5f3a832dc1eb45ed17