diff --git a/.travis.yml b/.travis.yml
index 41e4e1fa2..38727409a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,6 +10,9 @@ before_cache:
   - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
   - rm -fr $HOME/.gradle/caches/*/plugin-resolution/
   - rm -fr $HOME/.gradle/caches/*/scripts/
+  - rm -fr $HOME/.gradle/caches/*/scripts-remapped/
+  - rm -f  $HOME/.gradle/caches/*/fileHashes/fileHashes.bin
+  - rm -f  $HOME/.gradle/caches/*/fileHashes/fileHashes.lock
 
 cache:
   directories:
diff --git a/build.gradle b/build.gradle
index 97ba4f6b9..dc41c1252 100644
--- a/build.gradle
+++ b/build.gradle
@@ -15,7 +15,7 @@ buildscript {
   dependencies {
     classpath "nl.javadude.gradle.plugins:license-gradle-plugin:0.11.0"
     classpath "org.ajoberstar:gradle-git:1.7.2"
-    classpath "com.google.protobuf:protobuf-gradle-plugin:0.7.3"
+    classpath "com.google.protobuf:protobuf-gradle-plugin:0.8.3"
     classpath "io.spring.gradle:docbook-reference-plugin:0.3.1"
     classpath "com.github.ben-manes:gradle-versions-plugin:0.17.0"
   }
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index e8c6bf7bb..5ccda13e9 100644
Binary files a/gradle/wrapper/gradle-wrapper.jar and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 7d05de321..1f1aae10e 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,6 @@
+#Tue Dec 19 12:13:17 MSK 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.11-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip
diff --git a/gradlew b/gradlew
index 97fac783e..9d82f7891 100755
--- a/gradlew
+++ b/gradlew
@@ -56,9 +56,9 @@ while [ -h "$PRG" ] ; do
     fi
 done
 SAVED="`pwd`"
-cd "`dirname \"$PRG\"`/" >&-
+cd "`dirname \"$PRG\"`/" >/dev/null
 APP_HOME="`pwd -P`"
-cd "$SAVED" >&-
+cd "$SAVED" >/dev/null
 
 CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
 
diff --git a/gradlew.bat b/gradlew.bat
index 8a0b282aa..5f192121e 100644
--- a/gradlew.bat
+++ b/gradlew.bat
@@ -46,7 +46,7 @@ echo location of your Java installation.
 goto fail
 
 :init
-@rem Get command-line arguments, handling Windowz variants
+@rem Get command-line arguments, handling Windows variants
 
 if not "%OS%" == "Windows_NT" goto win9xME_args
 if "%@eval[2+2]" == "4" goto 4NT_args