diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index 69db37e..8b0c0bb 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -6,16 +6,16 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go: [ '1.11.x', '1.12.x', '1.13.x' ]
+        go: [ '1.13.x', '1.14.x', '1.15.x' ]
     name: Vulcanizer tests against go version ${{ matrix.go }}
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
     - name: Setup go
-      uses: actions/setup-go@v1
+      uses: actions/setup-go@v2
       with:
         go-version: ${{ matrix.go }}
     - name: Run tests
       run: |
-        curl -sfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $GOROOT/bin v1.18.0
+        curl -sfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $GOROOT/bin v1.31.0
         sudo sysctl -w vm.max_map_count=262144
         script/integration-test
diff --git a/Brewfile b/Brewfile
deleted file mode 100644
index d70ea43..0000000
--- a/Brewfile
+++ /dev/null
@@ -1 +0,0 @@
-brew 'dep'
diff --git a/go.mod b/go.mod
index f0a35b1..6b4dac5 100644
--- a/go.mod
+++ b/go.mod
@@ -6,11 +6,13 @@ require (
 	github.com/elazarl/goproxy v0.0.0-20191011121108-aa519ddbe484 // indirect
 	github.com/google/go-cmp v0.2.0 // indirect
 	github.com/jeremywohl/flatten v0.0.0-20180616191615-6ba45bff2452
+	github.com/mattn/go-colorable v0.1.7 // indirect
 	github.com/mattn/go-runewidth v0.0.3 // indirect
 	github.com/moul/http2curl v1.0.0 // indirect
 	github.com/olekukonko/tablewriter v0.0.0-20180506121414-d4647c9c7a84
 	github.com/parnurzeal/gorequest v0.2.15
 	github.com/pkg/errors v0.8.0 // indirect
+	github.com/rakyll/gotest v0.0.5 // indirect
 	github.com/smartystreets/goconvey v1.6.4 // indirect
 	github.com/spf13/cobra v0.0.5
 	github.com/spf13/pflag v1.0.5 // indirect
@@ -18,5 +20,6 @@ require (
 	github.com/stretchr/testify v1.4.0 // indirect
 	github.com/tidwall/gjson v1.1.3
 	github.com/tidwall/match v1.0.0 // indirect
+	golang.org/x/sys v0.0.0-20200926100807-9d91bd62050c // indirect
 	gotest.tools v2.2.0+incompatible
 )
diff --git a/go.sum b/go.sum
index 378d54c..b6d90e2 100644
--- a/go.sum
+++ b/go.sum
@@ -12,6 +12,8 @@ github.com/elazarl/goproxy v0.0.0-20191011121108-aa519ddbe484 h1:pEtiCjIXx3RvGjl
 github.com/elazarl/goproxy v0.0.0-20191011121108-aa519ddbe484/go.mod h1:Ro8st/ElPeALwNFlcTpWmkr6IoMFfkjXAvTHpevnDsM=
 github.com/elazarl/goproxy/ext v0.0.0-20190711103511-473e67f1d7d2 h1:dWB6v3RcOy03t/bUadywsbyrQwCqZeNIEX6M1OtSZOM=
 github.com/elazarl/goproxy/ext v0.0.0-20190711103511-473e67f1d7d2/go.mod h1:gNh8nYJoAm43RfaxurUnxr+N1PwuFV3ZMl/efxlIlY8=
+github.com/fatih/color v1.9.0 h1:8xPHl4/q1VyqGIPif1F+1V3Y3lSmrq01EabUW3CoW5s=
+github.com/fatih/color v1.9.0/go.mod h1:eQcE1qtQxscV5RaZvpXrrb8Drkc3/DdQ+uUYCNjL+zU=
 github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/google/go-cmp v0.2.0 h1:+dTQ8DZQJz0Mb/HjFlkptS1FeQ4cWSnN941F8aEG4SQ=
@@ -28,6 +30,15 @@ github.com/jtolds/gls v4.20.0+incompatible h1:xdiiI2gbIgH/gLH7ADydsJ1uDOEzR8yvV7
 github.com/jtolds/gls v4.20.0+incompatible/go.mod h1:QJZ7F/aHp+rZTRtaJ1ow/lLfFfVYBRgL+9YlvaHOwJU=
 github.com/magiconair/properties v1.8.0 h1:LLgXmsheXeRoUOBOjtwPQCWIYqM/LU1ayDtDePerRcY=
 github.com/magiconair/properties v1.8.0/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
+github.com/mattn/go-colorable v0.1.4 h1:snbPLB8fVfU9iwbbo30TPtbLRzwWu6aJS6Xh4eaaviA=
+github.com/mattn/go-colorable v0.1.4/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVcfRqFIhoBtE=
+github.com/mattn/go-colorable v0.1.7 h1:bQGKb3vps/j0E9GfJQ03JyhRuxsvdAanXlT9BTw3mdw=
+github.com/mattn/go-colorable v0.1.7/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
+github.com/mattn/go-isatty v0.0.8/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
+github.com/mattn/go-isatty v0.0.11 h1:FxPOTFNqGkuDUGi3H/qkUbQO4ZiBa2brKq5r0l8TGeM=
+github.com/mattn/go-isatty v0.0.11/go.mod h1:PhnuNfih5lzO57/f3n+odYbM4JtupLOxQOAqxQCu2WE=
+github.com/mattn/go-isatty v0.0.12 h1:wuysRhFDzyxgEmMf5xjvJ2M9dZoWAXNNr5LSBS7uHXY=
+github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
 github.com/mattn/go-runewidth v0.0.3 h1:a+kO+98RDGEfo6asOGMmpodZq4FNtnGP54yps8BzLR4=
 github.com/mattn/go-runewidth v0.0.3/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
 github.com/mitchellh/go-homedir v1.1.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
@@ -45,6 +56,8 @@ github.com/pkg/errors v0.8.0 h1:WdK/asTD0HN+q6hsWO3/vpuAkAr+tw6aNJNDFFf0+qw=
 github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/rakyll/gotest v0.0.5 h1:+BrdqPxKPDaxvhtIiVzfiYXLhi4BrSOqdwaEiA7qjpk=
+github.com/rakyll/gotest v0.0.5/go.mod h1:SkoesdNCWmiD4R2dljIUcfSnNdVZ12y8qK4ojDkc2Sc=
 github.com/rogpeppe/go-charset v0.0.0-20180617210344-2471d30d28b4/go.mod h1:qgYeAmZ5ZIpBWTGllZSQnw97Dj+woV0toclVaRGI8pc=
 github.com/russross/blackfriday v1.5.2/go.mod h1:JO/DiYxRf+HjHt06OyowR9PTA263kcR/rfWxYHBV53g=
 github.com/smartystreets/assertions v0.0.0-20180927180507-b2de0cb4f26d h1:zE9ykElWQ6/NYmHa3jpm/yHnI4xSofP+UP6SpjHcSeM=
@@ -82,6 +95,13 @@ golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn
 golang.org/x/sys v0.0.0-20181205085412-a5c9d58dba9a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a h1:1BGLXjeY4akVXGgbC9HugT3Jv3hCI0z56oJR5vAMgBU=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20191026070338-33540a1f6037 h1:YyJpGZS1sBuBCzLAR1VEpK193GlqGZbnPFnPV/5Rsb4=
+golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200926100807-9d91bd62050c h1:38q6VNPWR010vN82/SB121GujZNIfAUb4YttE2rhGuc=
+golang.org/x/sys v0.0.0-20200926100807-9d91bd62050c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/tools v0.0.0-20190328211700-ab21143f2384/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
diff --git a/integration_data/v5/elasticsearch.dockerfile b/integration_data/v5/elasticsearch.dockerfile
index 92ffdfd..411cd60 100644
--- a/integration_data/v5/elasticsearch.dockerfile
+++ b/integration_data/v5/elasticsearch.dockerfile
@@ -1,4 +1,4 @@
-FROM docker.elastic.co/elasticsearch/elasticsearch:5.6.15
+FROM docker.elastic.co/elasticsearch/elasticsearch:5.6.16
 
 USER root
 
diff --git a/integration_data/v6/elasticsearch.dockerfile b/integration_data/v6/elasticsearch.dockerfile
index 8201944..5820fdb 100644
--- a/integration_data/v6/elasticsearch.dockerfile
+++ b/integration_data/v6/elasticsearch.dockerfile
@@ -1,4 +1,4 @@
-FROM docker.elastic.co/elasticsearch/elasticsearch:6.8.0
+FROM docker.elastic.co/elasticsearch/elasticsearch:6.8.12
 
 USER root
 
diff --git a/integration_data/v7/elasticsearch.dockerfile b/integration_data/v7/elasticsearch.dockerfile
index 038b20f..85d97ec 100644
--- a/integration_data/v7/elasticsearch.dockerfile
+++ b/integration_data/v7/elasticsearch.dockerfile
@@ -1,4 +1,4 @@
-FROM docker.elastic.co/elasticsearch/elasticsearch:7.4.2
+FROM docker.elastic.co/elasticsearch/elasticsearch:7.9.2
 
 USER root
 
diff --git a/pkg/cli/settings.go b/pkg/cli/settings.go
index f4c5b0f..2c5968e 100644
--- a/pkg/cli/settings.go
+++ b/pkg/cli/settings.go
@@ -14,7 +14,7 @@ func init() {
 
 func printSettings(settings []vulcanizer.Setting, name string) {
 	if len(settings) == 0 {
-		fmt.Println(fmt.Sprintf("No %s are set.\n", name))
+		fmt.Printf("No %s are set.\n", name)
 		return
 	}
 
diff --git a/script/bootstrap b/script/bootstrap
index cd1b504..37528cf 100755
--- a/script/bootstrap
+++ b/script/bootstrap
@@ -3,11 +3,6 @@
 if [ "$(uname -s)" = "Darwin" ]; then
   mkdir -p tmp
 
-  brew bundle &> tmp/brew-bundle.log || (
-      echo "Failed to brew bundle:"
-      cat tmp/brew-bundle.log
-  )
-
   if [[ ! -x "$(which go)" ]]; then
     echo >&2 "vulcanizer requires an installation of Go to build."
     exit 1
@@ -17,6 +12,6 @@ if [ "$(uname -s)" = "Darwin" ]; then
 fi
 
 # Install linter. Should be universal. Version is pinned per package recommendations.
-curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $GOPATH/bin v1.15.0
+curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $GOPATH/bin v1.31.0
 
 script/build
diff --git a/script/dep b/script/dep
deleted file mode 100755
index 1ff2e3b..0000000
--- a/script/dep
+++ /dev/null
@@ -1,9 +0,0 @@
-#!/bin/bash -e
-
-# dep gets confused if it's run when pwd is a symlink into $GOPATH.
-scripts="$(dirname "$0")"
-root="$(dirname "$scripts")"
-cd -P "$root"
-
-echo Updating vendor...
-dep ensure "$@"