diff --git a/.circleci/images/primary/Dockerfile b/.circleci/images/primary/Dockerfile
index f193510..25cebae 100644
--- a/.circleci/images/primary/Dockerfile
+++ b/.circleci/images/primary/Dockerfile
@@ -1,5 +1,5 @@
 # FROM golang:1.10.1
-FROM golang:1.16.5-stretch AS build
+FROM golang:1.16.6-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 746d371..e7c71e3 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: 1.16.5
+  GOVERSION: 1.16.6
   # GOPATH: c:\gopath
 
 # scripts that run after cloning repository
diff --git a/examples/bitmap/main.go b/examples/bitmap/main.go
index adaf329..be1dee6 100644
--- a/examples/bitmap/main.go
+++ b/examples/bitmap/main.go
@@ -132,6 +132,12 @@ func bitmapTest(bmp robotgo.CBitmap) {
 
 	fx, fy = robotgo.FindBitmap(bit)
 	fmt.Println("FindBitmap------", fx, fy)
+
+	fx, fy = robotgo.FindBitmap(bit, nil, 0.2)
+	fmt.Println("find bitmap: ", fx, fy)
+
+	fx, fy = robotgo.FindBitmap(bit, bitmap, 0.3)
+	fmt.Println("find bitmap: ", fx, fy)
 }
 
 func findBitmap(bmp robotgo.CBitmap) {