diff --git a/.drone.yml b/.drone.yml
index ec9653a..d2806d0 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -1,12 +1,13 @@
 ---
 kind: pipeline
-type: docker
+type: kubernetes
 name: default
 
 steps:
-- name: go-1.18
-  image: golang:1.18
+- name: build and test
+  image: golang:1.21
   commands:
+    - go env -w GOFLAGS="-buildvcs=false"
     - go install honnef.co/go/tools/cmd/staticcheck@latest
     - go build ./...
     - go vet ./...
diff --git a/go.mod b/go.mod
index 1dfa985..04de986 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module git.netflux.io/rob/envfilesubst
 go 1.18
 
 require (
-	github.com/hashicorp/go-envparse v0.0.0-20200406174449-d9cfd743a15e
+	github.com/hashicorp/go-envparse v0.1.0
 	github.com/stretchr/testify v1.7.1
 )
 
diff --git a/go.sum b/go.sum
index a6a3a3d..2c1cfd6 100644
--- a/go.sum
+++ b/go.sum
@@ -2,6 +2,8 @@ github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/hashicorp/go-envparse v0.0.0-20200406174449-d9cfd743a15e h1:v1d9+AJMP6i4p8BSKNU0InuvmIAdZjQLNN19V86AG4Q=
 github.com/hashicorp/go-envparse v0.0.0-20200406174449-d9cfd743a15e/go.mod h1:/NlxCzN2D4C4L2uDE6ux/h6jM+n98VFQM14nnCIfHJU=
+github.com/hashicorp/go-envparse v0.1.0 h1:bE++6bhIsNCPLvgDZkYqo3nA+/PFI51pkrHdmPSDFPY=
+github.com/hashicorp/go-envparse v0.1.0/go.mod h1:OHheN1GoygLlAkTlXLXvAdnXdZxy8JUweQ1rAXx1xnc=
 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/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=