diff --git a/extras/rhubarb-for-spine/gradle/wrapper/gradle-wrapper.jar b/extras/rhubarb-for-spine/gradle/wrapper/gradle-wrapper.jar
index 5c37b44..27768f1 100644
Binary files a/extras/rhubarb-for-spine/gradle/wrapper/gradle-wrapper.jar and b/extras/rhubarb-for-spine/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/extras/rhubarb-for-spine/gradle/wrapper/gradle-wrapper.properties b/extras/rhubarb-for-spine/gradle/wrapper/gradle-wrapper.properties
index 22c733c..62e1e30 100644
--- a/extras/rhubarb-for-spine/gradle/wrapper/gradle-wrapper.properties
+++ b/extras/rhubarb-for-spine/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,5 @@
-#Tue Nov 28 18:16:46 CET 2017
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.3-bin.zip
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-3.5-rc-2-all.zip
+zipStoreBase=GRADLE_USER_HOME
diff --git a/extras/rhubarb-for-spine/gradlew b/extras/rhubarb-for-spine/gradlew
index 4453cce..cccdd3d 100644
--- a/extras/rhubarb-for-spine/gradlew
+++ b/extras/rhubarb-for-spine/gradlew
@@ -33,11 +33,11 @@ DEFAULT_JVM_OPTS=""
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD="maximum"
 
-warn ( ) {
+warn () {
     echo "$*"
 }
 
-die ( ) {
+die () {
     echo
     echo "$*"
     echo
@@ -155,7 +155,7 @@ if $cygwin ; then
 fi
 
 # Escape application args
-save ( ) {
+save () {
     for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
     echo " "
 }