diff --git a/curator-test-zk35/pom.xml b/curator-test-zk35/pom.xml
index a1828ff4a..be307a221 100644
--- a/curator-test-zk35/pom.xml
+++ b/curator-test-zk35/pom.xml
@@ -31,7 +31,7 @@
     <artifactId>curator-test-zk35</artifactId>
 
     <properties>
-        <zookeeper-35-version>3.5.7</zookeeper-35-version>
+        <zookeeper-35-version>3.8.6</zookeeper-35-version>
     </properties>
 
     <dependencies>
diff --git a/curator-test-zk36/pom.xml b/curator-test-zk36/pom.xml
index eb6758af9..b53edd8e2 100644
--- a/curator-test-zk36/pom.xml
+++ b/curator-test-zk36/pom.xml
@@ -31,7 +31,7 @@
     <artifactId>curator-test-zk36</artifactId>
 
     <properties>
-        <zookeeper-36-version>3.6.3</zookeeper-36-version>
+        <zookeeper-36-version>3.8.6</zookeeper-36-version>
     </properties>
 
     <dependencies>
diff --git a/curator-test-zk37/pom.xml b/curator-test-zk37/pom.xml
index 3f739509c..d101279db 100644
--- a/curator-test-zk37/pom.xml
+++ b/curator-test-zk37/pom.xml
@@ -31,7 +31,7 @@
     <artifactId>curator-test-zk37</artifactId>
 
     <properties>
-        <zookeeper-37-version>3.7.2</zookeeper-37-version>
+        <zookeeper-37-version>3.8.6</zookeeper-37-version>
     </properties>
 
     <dependencies>
diff --git a/curator-test-zk38/pom.xml b/curator-test-zk38/pom.xml
index 07cd162b5..cf2f3db59 100644
--- a/curator-test-zk38/pom.xml
+++ b/curator-test-zk38/pom.xml
@@ -31,7 +31,7 @@
     <artifactId>curator-test-zk38</artifactId>
 
     <properties>
-        <zookeeper-38-version>3.8.4</zookeeper-38-version>
+        <zookeeper-38-version>3.8.6</zookeeper-38-version>
     </properties>
 
     <dependencies>
diff --git a/pom.xml b/pom.xml
index dcb66808e..3acc352df 100644
--- a/pom.xml
+++ b/pom.xml
@@ -72,7 +72,7 @@
         <redirectTestOutputToFile>true</redirectTestOutputToFile>
 
         <!-- versions -->
-        <zookeeper-version>3.9.4</zookeeper-version>
+        <zookeeper-version>3.8.6</zookeeper-version>
         <maven-bundle-plugin-version>5.1.4</maven-bundle-plugin-version>
         <maven-compiler-plugin-version>3.10.0</maven-compiler-plugin-version>
         <maven-dependency-plugin-version>3.2.0</maven-dependency-plugin-version>