diff --git a/dev/appveyor-install-dependencies.ps1 b/dev/appveyor-install-dependencies.ps1
index 5a729674c3cb36c9f8ae11cfa88960b27ed0f62f..1350095a945d70e795264142782ab76a3ba1e2e0 100644
--- a/dev/appveyor-install-dependencies.ps1
+++ b/dev/appveyor-install-dependencies.ps1
@@ -95,7 +95,7 @@ $env:MAVEN_OPTS = "-Xmx2g -XX:MaxPermSize=512M -XX:ReservedCodeCacheSize=512m"
 Pop-Location
 
 # ========================== Hadoop bin package
-$hadoopVer = "2.6.5"
+$hadoopVer = "2.6.4"
 $hadoopPath = "$tools\hadoop"
 if (!(Test-Path $hadoopPath)) {
     New-Item -ItemType Directory -Force -Path $hadoopPath | Out-Null