diff --git a/src/main/java/com/bettercloud/vault/SslConfig.java b/src/main/java/com/bettercloud/vault/SslConfig.java
index 21179b14..3b2e3a41 100644
--- a/src/main/java/com/bettercloud/vault/SslConfig.java
+++ b/src/main/java/com/bettercloud/vault/SslConfig.java
@@ -44,16 +44,16 @@ public class SslConfig implements Serializable {
     private static final String VAULT_SSL_VERIFY = "VAULT_SSL_VERIFY";
     private static final String VAULT_SSL_CERT = "VAULT_SSL_CERT";
 
-    private boolean verify;
-    private transient SSLContext sslContext;
-    private transient KeyStore trustStore;
-    private transient KeyStore keyStore;
-    private String keyStorePassword;
-    private String pemUTF8;  // exposed to unit tests
-    private String clientPemUTF8;
-    private String clientKeyPemUTF8;
-    private Boolean verifyObject;
-    private EnvironmentLoader environmentLoader;
+    private volatile boolean verify;
+    private volatile transient SSLContext sslContext;
+    private volatile transient KeyStore trustStore;
+    private volatile transient KeyStore keyStore;
+    private volatile String keyStorePassword;
+    private volatile String pemUTF8;  // exposed to unit tests
+    private volatile String clientPemUTF8;
+    private volatile String clientKeyPemUTF8;
+    private volatile Boolean verifyObject;
+    private volatile EnvironmentLoader environmentLoader;
 
     /**
      * <p>The code used to load environment variables is encapsulated here, so that a mock version of that environment
diff --git a/src/main/java/com/bettercloud/vault/VaultConfig.java b/src/main/java/com/bettercloud/vault/VaultConfig.java
index 7d4545fd..9fa93b4e 100644
--- a/src/main/java/com/bettercloud/vault/VaultConfig.java
+++ b/src/main/java/com/bettercloud/vault/VaultConfig.java
@@ -30,18 +30,18 @@ public class VaultConfig implements Serializable {
     private static final String VAULT_OPEN_TIMEOUT = "VAULT_OPEN_TIMEOUT";
     private static final String VAULT_READ_TIMEOUT = "VAULT_READ_TIMEOUT";
 
-    private Map<String, String> secretsEnginePathMap = new ConcurrentHashMap<>();
-    private String address;
-    private String token;
-    private SslConfig sslConfig;
-    private Integer openTimeout;
-    private Integer readTimeout;
-    private int prefixPathDepth = 1;
-    private int maxRetries;
-    private int retryIntervalMilliseconds;
-    private Integer globalEngineVersion;
-    private String nameSpace;
-    private EnvironmentLoader environmentLoader;
+    private volatile Map<String, String> secretsEnginePathMap = new ConcurrentHashMap<>();
+    private volatile String address;
+    private volatile String token;
+    private volatile SslConfig sslConfig;
+    private volatile Integer openTimeout;
+    private volatile Integer readTimeout;
+    private volatile int prefixPathDepth = 1;
+    private volatile int maxRetries;
+    private volatile int retryIntervalMilliseconds;
+    private volatile Integer globalEngineVersion;
+    private volatile String nameSpace;
+    private volatile EnvironmentLoader environmentLoader;
 
     /**
      * <p>The code used to load environment variables is encapsulated here, so that a mock version of that environment