diff --git a/kobalt/wrapper/kobalt-wrapper.properties b/kobalt/wrapper/kobalt-wrapper.properties
index d630dff..0ca8045 100644
--- a/kobalt/wrapper/kobalt-wrapper.properties
+++ b/kobalt/wrapper/kobalt-wrapper.properties
@@ -1 +1 @@
-kobalt.version=1.0.114
\ No newline at end of file
+kobalt.version=1.0.122
\ No newline at end of file
diff --git a/samples/java/gradle/wrapper/gradle-wrapper.jar b/samples/java/gradle/wrapper/gradle-wrapper.jar
index 87b738c..5c2d1cf 100644
Binary files a/samples/java/gradle/wrapper/gradle-wrapper.jar and b/samples/java/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/samples/java/gradle/wrapper/gradle-wrapper.properties b/samples/java/gradle/wrapper/gradle-wrapper.properties
index 44e7c4d..ea13fdf 100644
--- a/samples/java/gradle/wrapper/gradle-wrapper.properties
+++ b/samples/java/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.2.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.3.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/samples/java/gradlew b/samples/java/gradlew
index af6708f..b0d6d0a 100755
--- a/samples/java/gradlew
+++ b/samples/java/gradlew
@@ -1,5 +1,21 @@
 #!/usr/bin/env sh
 
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
 ##############################################################################
 ##
 ##  Gradle start up script for UN*X
@@ -28,7 +44,7 @@ APP_NAME="Gradle"
 APP_BASE_NAME=`basename "$0"`
 
 # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS='"-Xmx64m"'
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD="maximum"
diff --git a/samples/java/gradlew.bat b/samples/java/gradlew.bat
index 6d57edc..9991c50 100644
--- a/samples/java/gradlew.bat
+++ b/samples/java/gradlew.bat
@@ -1,3 +1,19 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      http://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
 @if "%DEBUG%" == "" @echo off
 @rem ##########################################################################
 @rem
@@ -14,7 +30,7 @@ set APP_BASE_NAME=%~n0
 set APP_HOME=%DIRNAME%
 
 @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-set DEFAULT_JVM_OPTS="-Xmx64m"
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
 
 @rem Find java.exe
 if defined JAVA_HOME goto findJavaFromJavaHome
diff --git a/samples/kotlin/gradle/wrapper/gradle-wrapper.jar b/samples/kotlin/gradle/wrapper/gradle-wrapper.jar
index 87b738c..5c2d1cf 100644
Binary files a/samples/kotlin/gradle/wrapper/gradle-wrapper.jar and b/samples/kotlin/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/samples/kotlin/gradle/wrapper/gradle-wrapper.properties b/samples/kotlin/gradle/wrapper/gradle-wrapper.properties
index 44e7c4d..ea13fdf 100644
--- a/samples/kotlin/gradle/wrapper/gradle-wrapper.properties
+++ b/samples/kotlin/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.2.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.3.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/samples/kotlin/gradlew b/samples/kotlin/gradlew
index af6708f..b0d6d0a 100755
--- a/samples/kotlin/gradlew
+++ b/samples/kotlin/gradlew
@@ -1,5 +1,21 @@
 #!/usr/bin/env sh
 
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
 ##############################################################################
 ##
 ##  Gradle start up script for UN*X
@@ -28,7 +44,7 @@ APP_NAME="Gradle"
 APP_BASE_NAME=`basename "$0"`
 
 # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS='"-Xmx64m"'
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD="maximum"
diff --git a/samples/kotlin/gradlew.bat b/samples/kotlin/gradlew.bat
index 6d57edc..9991c50 100644
--- a/samples/kotlin/gradlew.bat
+++ b/samples/kotlin/gradlew.bat
@@ -1,3 +1,19 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      http://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
 @if "%DEBUG%" == "" @echo off
 @rem ##########################################################################
 @rem
@@ -14,7 +30,7 @@ set APP_BASE_NAME=%~n0
 set APP_HOME=%DIRNAME%
 
 @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-set DEFAULT_JVM_OPTS="-Xmx64m"
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
 
 @rem Find java.exe
 if defined JAVA_HOME goto findJavaFromJavaHome
diff --git a/samples/kotlin/kobalt/wrapper/kobalt-wrapper.properties b/samples/kotlin/kobalt/wrapper/kobalt-wrapper.properties
index 132bac2..0ca8045 100644
--- a/samples/kotlin/kobalt/wrapper/kobalt-wrapper.properties
+++ b/samples/kotlin/kobalt/wrapper/kobalt-wrapper.properties
@@ -1 +1 @@
-kobalt.version=1.0.114
+kobalt.version=1.0.122
\ No newline at end of file
diff --git a/updatewrappers.sh b/updatewrappers.sh
new file mode 100644
index 0000000..ec95a87
--- /dev/null
+++ b/updatewrappers.sh
@@ -0,0 +1,30 @@
+#!/bin/bash
+
+export JAVA_HOME="$JAVA8_HOME"
+export PATH="$(cygpath "$JAVA_HOME")/bin:$PATH"
+
+declare -a dirs=("${PWD##*/}" "samples/java" "samples/kotlin")
+pwd=$PWD
+
+updateWrappers() {
+    if [ -d gradle ]; then
+        gradle -q --console=plain wrapper
+        echo -e "    $(./gradlew --version | grep Gradle)"
+    fi
+    if [ -d kobalt ]; then
+        ./kobaltw --update --log 0
+        echo -e "    Kobalt $(cut -d "=" -f 2 kobalt/wrapper/kobalt-wrapper.properties)"
+    fi
+}
+
+color=$(tput setaf 6)
+normal=$(tput sgr0)
+
+for d in "${dirs[@]}"; do
+    if [ -d "$d" ]; then
+        cd "$d" || exit 1
+    fi
+    echo -e "${color}${d}${normal}"
+    updateWrappers
+    cd "$pwd"
+done