diff --git a/.dockerignore b/.dockerignore
index 4eedf2e..ccf61e7 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -4,5 +4,6 @@
 
 .git
 .github
+.gitignore
 vendor/
 Dockerfile
diff --git a/.drone.yml b/.drone.yml
index b234d7c..97ed804 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -9,7 +9,7 @@ platform:
 
 steps:
 - name: test
-  image: golang:1.17-alpine3.15
+  image: public.ecr.aws/docker/library/golang:1.18-alpine3.15
   commands:
   - go version
   - go fmt ./...
diff --git a/Dockerfile b/Dockerfile
index b2698b5..6e8c418 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,12 +1,10 @@
-FROM golang:1.17-alpine3.15 AS builder
-LABEL maintainer="guessi <guessi@gmail.com>"
+FROM public.ecr.aws/docker/library/golang:1.18-alpine3.15 AS builder
 RUN apk add --no-cache git ca-certificates
 WORKDIR ${GOPATH}/src/github.com/guessi/ssl-certs-checker
-COPY . .
+COPY *.go go.mod go.sum ./
 RUN GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o /go/bin/ssl-certs-checker
 
 FROM scratch
-LABEL maintainer="guessi <guessi@gmail.com>"
 COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
 COPY --from=builder /go/bin/ssl-certs-checker /opt/
 WORKDIR /opt/
diff --git a/README.md b/README.md
index b659b92..89e354a 100644
--- a/README.md
+++ b/README.md
@@ -33,21 +33,9 @@
     +--------------------+----------------+----------------+-------------------------------+-------------------------------+--------------------+------------+
     | Host               | Common Name    | DNS Names      | Not Before                    | Not After                     | PublicKeyAlgorithm | Issuer     |
     +--------------------+----------------+----------------+-------------------------------+-------------------------------+--------------------+------------+
-    | www.google.com:443 | www.google.com | www.google.com | 2022-02-28 03:35:56 +0000 UTC | 2022-05-23 03:35:55 +0000 UTC | ECDSA              | GTS CA 1C3 |
+    | www.google.com:443 | www.google.com | www.google.com | 2022-03-28 02:26:07 +0000 UTC | 2022-06-20 02:26:06 +0000 UTC | ECDSA              | GTS CA 1C3 |
     +--------------------+----------------+----------------+-------------------------------+-------------------------------+--------------------+------------+
 
-## Build from Source
-
-    go get -u github.com/guessi/ssl-certs-checker
-
-    cd ${GOPATH}/src/github.com/guessi/ssl-certs-checker
-
-    vim ... # made some changes
-
-    go install github.com/guessi/ssl-certs-checker
-
-    ssl-certs-checker --help
-
 # License
 
 [MIT LICENSE](LICENSE)
diff --git a/go.mod b/go.mod
index 98cef77..a6e3184 100644
--- a/go.mod
+++ b/go.mod
@@ -1,9 +1,9 @@
 module github.com/guessi/ssl-certs-checker
 
-go 1.17
+go 1.18
 
 require (
-	github.com/jedib0t/go-pretty/v6 v6.2.7
+	github.com/jedib0t/go-pretty/v6 v6.3.0
 	github.com/urfave/cli/v2 v2.4.0
 	gopkg.in/yaml.v2 v2.4.0
 )
diff --git a/go.sum b/go.sum
index c7b4603..1aa2569 100644
--- a/go.sum
+++ b/go.sum
@@ -3,8 +3,8 @@ github.com/cpuguy83/go-md2man/v2 v2.0.1 h1:r/myEWzV9lfsM1tFLgDyu0atFtJ1fXn261LKY
 github.com/cpuguy83/go-md2man/v2 v2.0.1/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/jedib0t/go-pretty/v6 v6.2.7 h1:4823Lult/tJ0VI1PgW3aSKw59pMWQ6Kzv9b3Bj6MwY0=
-github.com/jedib0t/go-pretty/v6 v6.2.7/go.mod h1:FMkOpgGD3EZ91cW8g/96RfxoV7bdeJyzXPYgz1L1ln0=
+github.com/jedib0t/go-pretty/v6 v6.3.0 h1:QQ5yZPDUMEjbZRXDJtZlvwfDQqCYFaxV3yEzTkogUgk=
+github.com/jedib0t/go-pretty/v6 v6.3.0/go.mod h1:FMkOpgGD3EZ91cW8g/96RfxoV7bdeJyzXPYgz1L1ln0=
 github.com/mattn/go-runewidth v0.0.13 h1:lTGmDsbAYt5DmK6OnoV7EuIF1wEIFAcxld6ypU4OSgU=
 github.com/mattn/go-runewidth v0.0.13/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
 github.com/pkg/profile v1.6.0/go.mod h1:qBsxPvzyUincmltOk6iyRVxHYg4adc0OFOv72ZdLa18=