diff --git a/.circleci/config.yml b/.circleci/config.yml
index cedd39c..963b3e3 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -9,8 +9,8 @@ jobs:
     steps:
       - checkout
       # specify any bash command here prefixed with `run: `
-      - run: apt-get update
-      - run: apt-get -y install xvfb
+      - run: apt update
+      - run: apt -y install xvfb
       #
       #  override:
       # './...' is a relative pattern which means all subdirectories
diff --git a/.circleci/images/primary/Dockerfile b/.circleci/images/primary/Dockerfile
index c8c67fb..34a376b 100644
--- a/.circleci/images/primary/Dockerfile
+++ b/.circleci/images/primary/Dockerfile
@@ -2,7 +2,7 @@
 FROM golang:1.14.7-stretch AS build
 # FROM govgo/go:1.11.1
 
-RUN apt-get update && apt-get install -y --no-install-recommends \
+RUN apt update && apt install -y --no-install-recommends \
     # customize dependencies
     libx11-dev xorg-dev \
     # libgtkglextmm-x11-dev
@@ -16,10 +16,10 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     libxkbcommon-x11-dev libxkbcommon-dev \
     # Clipboard:
     xsel xclip && \
-    # RUN apt-get install -y xclip
+    # RUN apt install -y xclip
     #
-    apt-get remove --purge --auto-remove && \
-    apt-get clean               && \
+    apt remove --purge --auto-remove && \
+    apt clean               && \
     rm -rf /var/lib/apt/lists/*
 
 RUN go get -u github.com/go-vgo/robotgo
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
index 65a1c0d..1ba8d5c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -29,16 +29,16 @@ addons:
       #
       - xvfb
 # script:
-#  - sudo apt-get update
-#  - sudo apt-get install libx11-dev
-#  - sudo apt-get install xorg-dev
-#  - sudo apt-get install libxtst-dev libpng++-dev
+#  - sudo apt update
+#  - sudo apt install libx11-dev
+#  - sudo apt install xorg-dev
+#  - sudo apt install libxtst-dev libpng++-dev
 #  # Event:
-#  - sudo apt-get install xcb libxcb-xkb-dev x11-xkb-utils libx11-xcb-dev libxkbcommon-x11-dev
-#  - sudo apt-get install libxkbcommon-dev
+#  - sudo apt install xcb libxcb-xkb-dev x11-xkb-utils libx11-xcb-dev libxkbcommon-x11-dev
+#  - sudo apt install libxkbcommon-dev
 #  # Clipboard:
-#  - sudo apt-get install xsel
-#  - sudo apt-get install xclip
+#  - sudo apt install xsel
+#  - sudo apt install xclip
 #  - go test -v .
 
 before_install:
diff --git a/README.md b/README.md
index 286f3f4..ff19603 100644
--- a/README.md
+++ b/README.md
@@ -80,14 +80,14 @@ xcb, xkb, libxkbcommon
 ##### Ubuntu:
 
 ```yml
-sudo apt-get install gcc libc6-dev
+sudo apt install gcc libc6-dev
 
-sudo apt-get install libx11-dev xorg-dev libxtst-dev libpng++-dev
+sudo apt install libx11-dev xorg-dev libxtst-dev libpng++-dev
 
-sudo apt-get install xcb libxcb-xkb-dev x11-xkb-utils libx11-xcb-dev libxkbcommon-x11-dev
-sudo apt-get install libxkbcommon-dev
+sudo apt install xcb libxcb-xkb-dev x11-xkb-utils libx11-xcb-dev libxkbcommon-x11-dev
+sudo apt install libxkbcommon-dev
 
-sudo apt-get install xsel xclip
+sudo apt install xsel xclip
 ```
 
 #### Fedora:
diff --git a/README_zh.md b/README_zh.md
index 7388967..6a37b66 100644
--- a/README_zh.md
+++ b/README_zh.md
@@ -77,14 +77,14 @@ xcb, xkb, libxkbcommon
 ##### Ubuntu:
 
 ```yml
-sudo apt-get install gcc libc6-dev
+sudo apt install gcc libc6-dev
 
-sudo apt-get install libx11-dev xorg-dev libxtst-dev libpng++-dev
+sudo apt install libx11-dev xorg-dev libxtst-dev libpng++-dev
 
-sudo apt-get install xcb libxcb-xkb-dev x11-xkb-utils libx11-xcb-dev libxkbcommon-x11-dev
-sudo apt-get install libxkbcommon-dev
+sudo apt install xcb libxcb-xkb-dev x11-xkb-utils libx11-xcb-dev libxkbcommon-x11-dev
+sudo apt install libxkbcommon-dev
 
-sudo apt-get install xsel xclip
+sudo apt install xsel xclip
 
 ```