diff --git a/.gitignore b/.gitignore
index e660fd9..40c3ff3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 bin/
+coverage/
diff --git a/Dockerfile b/Dockerfile
index 9a0b24f..7810eb3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,28 +1,32 @@
 # syntax = docker/dockerfile:1-experimental
 
-FROM --platform=${BUILDPLATFORM} golang:1.15.0-alpine AS base
+FROM --platform=${BUILDPLATFORM} golang:1.15.2-alpine AS base
 WORKDIR /src
 ENV CGO_ENABLED=0
 COPY go.* .
-RUN go mod download
+RUN --mount=type=cache,target=/go/pkg/mod \
+    go mod download
 
 FROM base AS build
 ARG TARGETOS
 ARG TARGETARCH
 RUN --mount=target=. \
+    --mount=type=cache,target=/go/pkg/mod \
     --mount=type=cache,target=/root/.cache/go-build \
     GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build -o /out/example .
 
 FROM base AS unit-test
 RUN --mount=target=. \
+    --mount=type=cache,target=/go/pkg/mod \
     --mount=type=cache,target=/root/.cache/go-build \
     mkdir /out && go test -v -coverprofile=/out/cover.out ./...
 
-FROM golangci/golangci-lint:v1.27-alpine AS lint-base
+FROM golangci/golangci-lint:v1.31.0-alpine AS lint-base
 
 FROM base AS lint
 RUN --mount=target=. \
     --mount=from=lint-base,src=/usr/bin/golangci-lint,target=/usr/bin/golangci-lint \
+    --mount=type=cache,target=/go/pkg/mod \
     --mount=type=cache,target=/root/.cache/go-build \
     --mount=type=cache,target=/root/.cache/golangci-lint \
     golangci-lint run --timeout 10m0s ./...
@@ -40,4 +44,3 @@ FROM scratch AS bin-windows
 COPY --from=build /out/example /example.exe
 
 FROM bin-${TARGETOS} as bin
-
diff --git a/go.mod b/go.mod
index 4c05c79..c9f916e 100644
--- a/go.mod
+++ b/go.mod
@@ -1,8 +1,8 @@
 module github.com/chris-crone/containerized-go
 
-go 1.14
+go 1.15
 
 require (
 	github.com/pkg/errors v0.9.1
-	github.com/stretchr/testify v1.5.1
+	github.com/stretchr/testify v1.6.1
 )
diff --git a/go.sum b/go.sum
index 4516e6a..7034f5b 100644
--- a/go.sum
+++ b/go.sum
@@ -4,10 +4,11 @@ github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/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/stretchr/objx v0.1.0 h1:4G4v2dO3VZwixGIRoQ5Lfboy6nUhCyYzaqnIAPPhYs4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.5.1 h1:nOGnQDM7FYENwehXlg/kFVnos3rEvtKTjRvOWSzb6H4=
-github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
+github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
+github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=