diff --git a/.appveyor.yml b/.appveyor.yml
index 09078c237b7..5149f778caa 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -1,4 +1,4 @@
-version: 2.2.0.{build}
+version: 2.2.1.{build}
 
 image: Visual Studio 2015
 platform: x64
diff --git a/.travis.yml b/.travis.yml
index 92b3c5b4d4b..bc38f9759b6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,7 +11,6 @@ os:
 
 env:
   global:  # default values
-    - COMPILER=clang
     - PYTHON_VERSION=3.7
   matrix:
     - TASK=regular PYTHON_VERSION=3.6
@@ -42,8 +41,10 @@ before_install:
   - export BUILD_DIRECTORY="$TRAVIS_BUILD_DIR"
   - if [[ $TRAVIS_OS_NAME == "osx" ]]; then
         export OS_NAME="macos";
+        export COMPILER="gcc";
     else
         export OS_NAME="linux";
+        export COMPILER="clang";
     fi
   - export PATH="$HOME/miniconda/bin:$PATH"
   - export CONDA_ENV="test-env"
diff --git a/.vsts-ci.yml b/.vsts-ci.yml
index 7f7aac25480..24679d26e7c 100644
--- a/.vsts-ci.yml
+++ b/.vsts-ci.yml
@@ -62,7 +62,7 @@ phases:
 - phase: MacOS
 ###########################################
   variables:
-    COMPILER: gcc
+    COMPILER: clang
   queue:
     name: 'Hosted macOS Preview'
     parallel: 3
diff --git a/R-package/DESCRIPTION b/R-package/DESCRIPTION
index 50c4bba85ec..7d43f17ab57 100755
--- a/R-package/DESCRIPTION
+++ b/R-package/DESCRIPTION
@@ -1,8 +1,8 @@
 Package: lightgbm
 Type: Package
 Title: Light Gradient Boosting Machine
-Version: 2.2.0
-Date: 2018-09-17
+Version: 2.2.1
+Date: 2018-09-18
 Authors@R: c(
 	person("Guolin", "Ke", email = "guolin.ke@microsoft.com", role = c("aut", "cre")),
 	person("Damien", "Soukhavong", email = "damien.soukhavong@skema.edu", role = c("ctb")),
diff --git a/VERSION.txt b/VERSION.txt
index ccbccc3dc62..c043eea7767 100644
--- a/VERSION.txt
+++ b/VERSION.txt
@@ -1 +1 @@
-2.2.0
+2.2.1