diff --git a/.circleci/images/primary/Dockerfile b/.circleci/images/primary/Dockerfile
index 8683f83..fa9b536 100644
--- a/.circleci/images/primary/Dockerfile
+++ b/.circleci/images/primary/Dockerfile
@@ -1,5 +1,5 @@
 # FROM golang:1.10.1
-FROM golang:1.15.7-stretch AS build
+FROM golang:1.15.8-stretch AS build
 # FROM govgo/go:1.11.1
 
 RUN apt update && apt install -y --no-install-recommends \
diff --git a/appveyor.yml b/appveyor.yml
index d20d893..8296d21 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -34,7 +34,7 @@ environment:
       PATH: C:\msys64\mingw32\bin\;C:\Program Files (x86)\NSIS\;%PATH%
   # - COMPILER: MINGW_W64
   #   ARCHITECTURE: x64
-  GOVERSION: 1.15.7
+  GOVERSION: 1.15.8
   # GOPATH: c:\gopath
 
 # scripts that run after cloning repository
diff --git a/examples/bitmap/main.go b/examples/bitmap/main.go
index dea7b84..adaf329 100644
--- a/examples/bitmap/main.go
+++ b/examples/bitmap/main.go
@@ -60,6 +60,9 @@ func findColor(bmp robotgo.CBitmap) {
 
 	arr := robotgo.FindEveryColor(0xAADCDC)
 	fmt.Println("find all color: ", arr)
+	for i := 0; i < len(arr); i++ {
+		fmt.Println("pos is: ", arr[i].X, arr[i].Y)
+	}
 }
 
 func bitmapString(bmp robotgo.CBitmap) {
@@ -152,6 +155,9 @@ func findBitmap(bmp robotgo.CBitmap) {
 
 	arr := robotgo.FindEveryBitmap(openbit)
 	fmt.Println("find all bitmap: ", arr)
+	for i := 0; i < len(arr); i++ {
+		fmt.Println("pos is: ", arr[i].X, arr[i].Y)
+	}
 }
 
 func bitmap() {