diff --git a/.circleci/config.yml b/.circleci/config.yml
index 9b4e8ed09..218275483 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -25,6 +25,16 @@ workflows:
       - test-linux:
           name: Java 11 - Linux - OpenJDK
           docker-image: circleci/openjdk:11
+          requires:
+            - build-linux
+      - test-linux:
+          name: Java 13 - Linux - OpenJDK
+          docker-image: circleci/openjdk:13-jdk-buster
+          requires:
+            - build-linux
+      - test-linux:
+          name: Java 14 - Linux - OpenJDK
+          docker-image: circleci/openjdk:14-jdk-buster
           with-coverage: true
           requires:
             - build-linux
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d25ac49db..b18d87c80 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,7 +16,6 @@ All notable changes to the LaunchDarkly Java SDK will be documented in this file
 - In polling mode, temporary files used for HTTP caching (in the system temporary directory) were not being cleaned up when the client was closed.
 - Fixed incorrect sample code in the documentation comment for `FlagValueChangeListener`.
 
-
 ## [5.0.1] - 2020-06-19
 ### Fixed:
 - Fixed a bug that could cause worker threads for the EventSource stream to persist after closing the client, if the client had shut down the stream due to detecting an invalid SDK key.
@@ -72,6 +71,10 @@ This is a major rewrite that introduces a cleaner API design, adds new features,
 - The Redis integration is no longer built into the main SDK library. See: https://github.com/launchdarkly/java-server-sdk-redis
 - The deprecated New Relic integration has been removed.
 
+## [4.14.2] - 2020-09-01
+### Fixed:
+- Updated the version of OkHttp contained within the SDK from 3.12.10 to 3.14.9, to address multiple [known issues](https://square.github.io/okhttp/changelog_3x/) including an incompatibility with OpenJDK 8.0.252 under some conditions. ([#204](https://github.com/launchdarkly/java-server-sdk/issues/204))
+
 ## [4.14.1] - 2020-08-04
 ### Fixed:
 - Deserializing `LDUser` from JSON using Gson resulted in an object that had nulls in some fields where nulls were not expected, which could cause null pointer exceptions later. While there was no defined behavior for deserializing users in the 4.x SDK (it is supported in 5.0 and above), it was simple to fix. Results of deserializing with any other JSON framework are undefined. ([#199](https://github.com/launchdarkly/java-server-sdk/issues/199))
diff --git a/build.gradle b/build.gradle
index 331669ff2..0e9a726d2 100644
--- a/build.gradle
+++ b/build.gradle
@@ -73,6 +73,7 @@ ext.versions = [
     "guava": "28.2-jre",
     "jackson": "2.10.0", 
     "launchdarklyJavaSdkCommon": "1.0.0",
+    "okhttp": "4.8.1", // specify this for the SDK build instead of relying on the transitive dependency from okhttp-eventsource
     "okhttpEventsource": "2.3.1",
     "slf4j": "1.7.21",
     "snakeyaml": "1.19",
@@ -87,6 +88,7 @@ libraries.internal = [
     "commons-codec:commons-codec:${versions.commonsCodec}",
     "com.google.code.gson:gson:${versions.gson}",
     "com.google.guava:guava:${versions.guava}",
+    "com.squareup.okhttp3:okhttp:${versions.okhttp}",
     "com.launchdarkly:okhttp-eventsource:${versions.okhttpEventsource}",
     "org.yaml:snakeyaml:${versions.snakeyaml}",
 ]
@@ -100,8 +102,8 @@ libraries.external = [
 // Add dependencies to "libraries.test" that are used only in unit tests.
 libraries.test = [
 	// Note that the okhttp3 test deps must be kept in sync with the okhttp version used in okhttp-eventsource
-    "com.squareup.okhttp3:mockwebserver:4.5.0",
-    "com.squareup.okhttp3:okhttp-tls:4.5.0",
+    "com.squareup.okhttp3:mockwebserver:${versions.okhttp}",
+    "com.squareup.okhttp3:okhttp-tls:${versions.okhttp}",
     "org.hamcrest:hamcrest-all:1.3",
     "org.easymock:easymock:3.4",
     "junit:junit:4.12",
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index 29953ea14..f3d88b1c2 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 a2bf1313b..a4b442974 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.2.2-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
index cccdd3d51..2fe81a7d9 100755
--- a/gradlew
+++ b/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
+#
+#      https://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=""
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD="maximum"
@@ -109,8 +125,8 @@ if $darwin; then
     GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
 fi
 
-# For Cygwin, switch paths to Windows format before running java
-if $cygwin ; then
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
     APP_HOME=`cygpath --path --mixed "$APP_HOME"`
     CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
     JAVACMD=`cygpath --unix "$JAVACMD"`
@@ -138,19 +154,19 @@ if $cygwin ; then
         else
             eval `echo args$i`="\"$arg\""
         fi
-        i=$((i+1))
+        i=`expr $i + 1`
     done
     case $i in
-        (0) set -- ;;
-        (1) set -- "$args0" ;;
-        (2) set -- "$args0" "$args1" ;;
-        (3) set -- "$args0" "$args1" "$args2" ;;
-        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
-        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
-        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
-        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
-        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
-        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
     esac
 fi
 
@@ -159,14 +175,9 @@ save () {
     for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
     echo " "
 }
-APP_ARGS=$(save "$@")
+APP_ARGS=`save "$@"`
 
 # Collect all arguments for the java command, following the shell quoting and substitution rules
 eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
 
-# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
-if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
-  cd "$(dirname "$0")"
-fi
-
 exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
index e95643d6a..9109989e3 100644
--- a/gradlew.bat
+++ b/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      https://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
@@ -13,8 +29,11 @@ if "%DIRNAME%" == "" set DIRNAME=.
 set APP_BASE_NAME=%~n0
 set APP_HOME=%DIRNAME%
 
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
 @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=
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
 
 @rem Find java.exe
 if defined JAVA_HOME goto findJavaFromJavaHome