diff --git a/.circleci/config.yml b/.circleci/config.yml
deleted file mode 100644
index 007a11c..0000000
--- a/.circleci/config.yml
+++ /dev/null
@@ -1,14 +0,0 @@
-version: 2
-jobs:
-  build:
-    working_directory: /go/src/github.com/wcharczuk/go-chart
-    docker:
-      - image: circleci/golang:1.15
-    steps:
-      - checkout
-      - run:
-          name: new-install
-          command: make new-install
-      - run:
-          name: Continuous Integration
-          command: make
\ No newline at end of file
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..b48761c
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,33 @@
+name: "Continuous Integration"
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [ main ]
+    paths: [ "*.go" ]
+  pull_request:
+    branches: [ main ]
+    paths: [ "*.go" ]
+
+jobs:
+  ci:
+    name: "Tests"
+    runs-on: ubuntu-latest
+
+    env:
+      GOOS: "linux"
+      GOARCH: "amd64"
+      GO111MODULE: "on"
+      CGO_ENABLED: "0"
+
+    steps:
+    - name: Set up Go
+      uses: actions/setup-go@v3
+      with:
+        go-version: 1.21
+
+    - name: Check out go-incr
+      uses: actions/checkout@v3
+
+    - name: Run all tests
+      run: go test ./...
diff --git a/examples/horizontal_stacked_bar/main.go b/examples/horizontal_stacked_bar/main.go
index 5151524..f078d09 100644
--- a/examples/horizontal_stacked_bar/main.go
+++ b/examples/horizontal_stacked_bar/main.go
@@ -23,7 +23,7 @@ func main() {
 
 	stackedBarChart := chart.StackedBarChart{
 		Title:      "Quarterly Sales",
-		TitleStyle: chart.StyleShow(),
+		TitleStyle: chart.Shown(),
 		Background: chart.Style{
 			Padding: chart.Box{
 				Top: 75,
@@ -31,8 +31,8 @@ func main() {
 		},
 		Width:        800,
 		Height:       600,
-		XAxis:        chart.StyleShow(),
-		YAxis:        chart.StyleShow(),
+		XAxis:        chart.Shown(),
+		YAxis:        chart.Shown(),
 		BarSpacing:   40,
 		IsHorizontal: true,
 		Bars: []chart.StackedBar{
diff --git a/examples/stacked_bar_labels/main.go b/examples/stacked_bar_labels/main.go
index a62103f..314f1b4 100644
--- a/examples/stacked_bar_labels/main.go
+++ b/examples/stacked_bar_labels/main.go
@@ -23,7 +23,7 @@ func main() {
 
 	stackedBarChart := chart.StackedBarChart{
 		Title:      "Quarterly Sales",
-		TitleStyle: chart.StyleShow(),
+		TitleStyle: chart.Shown(),
 		Background: chart.Style{
 			Padding: chart.Box{
 				Top: 100,
@@ -31,8 +31,8 @@ func main() {
 		},
 		Width:      810,
 		Height:     500,
-		XAxis:      chart.StyleShow(),
-		YAxis:      chart.StyleShow(),
+		XAxis:      chart.Shown(),
+		YAxis:      chart.Shown(),
 		BarSpacing: 50,
 		Bars: []chart.StackedBar{
 			{
diff --git a/go.mod b/go.mod
index 3824b21..bcec18f 100644
--- a/go.mod
+++ b/go.mod
@@ -4,5 +4,5 @@ go 1.15
 
 require (
 	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0
-	golang.org/x/image v0.0.0-20200927104501-e162460cd6b5
+	golang.org/x/image v0.12.0
 )
diff --git a/go.sum b/go.sum
index 066121a..9bcd006 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,35 @@
 github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF08vX0COfcOBJRhZ8lUbR+ZWIs0Y5g=
 github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
-golang.org/x/image v0.0.0-20200927104501-e162460cd6b5 h1:QelT11PB4FXiDEXucrfNckHoFxwt8USGY1ajP1ZF5lM=
-golang.org/x/image v0.0.0-20200927104501-e162460cd6b5/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
+github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+golang.org/x/image v0.12.0 h1:w13vZbU4o5rKOFFR8y7M+c4A5jXDC0uXTdHYRP8X2DQ=
+golang.org/x/image v0.12.0/go.mod h1:Lu90jvHG7GfemOIcldsh9A2hS01ocl6oNO7ype5mEnk=
+golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
+golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
+golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
+golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
+golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
+golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
+golang.org/x/text v0.13.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
+golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/value_formatter_test.go b/value_formatter_test.go
index 86e0301..5ef94a8 100644
--- a/value_formatter_test.go
+++ b/value_formatter_test.go
@@ -4,7 +4,6 @@ import (
 	"testing"
 	"time"
 
-	"github.com/blend/go-sdk/assert"
 	"github.com/wcharczuk/go-chart/v2/testutil"
 )
 
@@ -59,8 +58,7 @@ func TestFloatValueFormatterWithFormat(t *testing.T) {
 }
 
 func TestExponentialValueFormatter(t *testing.T) {
-	assert := assert.New(t)
-	assert.Equal("1.23e+02", ExponentialValueFormatter(123.456))
-	assert.Equal("1.24e+07", ExponentialValueFormatter(12421243.424))
-	assert.Equal("4.50e-01", ExponentialValueFormatter(0.45))
+	testutil.AssertEqual(t, "1.23e+02", ExponentialValueFormatter(123.456))
+	testutil.AssertEqual(t, "1.24e+07", ExponentialValueFormatter(12421243.424))
+	testutil.AssertEqual(t, "4.50e-01", ExponentialValueFormatter(0.45))
 }