diff --git a/.drone.yml b/.drone.yml
index 226a505..d5abc61 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -25,7 +25,7 @@ steps:
   - name: setup-vault
     image: alpine:latest
     environment:
-      VAULT_VERSION: 1.15.0
+      VAULT_VERSION: 1.15.3
     commands:
       - wget -q -O vault_$${VAULT_VERSION}_linux_amd64.zip https://releases.hashicorp.com/vault/$${VAULT_VERSION}/vault_$${VAULT_VERSION}_linux_amd64.zip
       - wget -q -O - https://releases.hashicorp.com/vault/$${VAULT_VERSION}/vault_$${VAULT_VERSION}_SHA256SUMS | grep linux_amd64 | sha256sum -c
@@ -40,7 +40,7 @@ steps:
   - name: unit-integration-tests
     image: maven:3-eclipse-temurin-21
     environment:
-      VAULT_VERSION: 1.15.0
+      VAULT_VERSION: 1.15.3
     commands:
       - export PATH=.bin:$${PATH}
       - mvn -B -P integration-test verify
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4853e9c..9dbcaeb 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,7 +6,7 @@ jobs:
     strategy:
       matrix:
         jdk: [ 11, 17, 21 ]
-        vault: [ '1.2.0', '1.11.12', '1.15.0' ]
+        vault: [ '1.2.0', '1.11.12', '1.15.3' ]
         include:
           - jdk: 21
             vault: '1.11.12'
diff --git a/src/test/java/de/stklcode/jvault/connector/HTTPVaultConnectorIT.java b/src/test/java/de/stklcode/jvault/connector/HTTPVaultConnectorIT.java
index 54f7df1..2a932d6 100644
--- a/src/test/java/de/stklcode/jvault/connector/HTTPVaultConnectorIT.java
+++ b/src/test/java/de/stklcode/jvault/connector/HTTPVaultConnectorIT.java
@@ -51,7 +51,7 @@
  * @since 0.1
  */
 class HTTPVaultConnectorIT {
-    private static String VAULT_VERSION = "1.15.0";  // The vault version this test is supposed to run against.
+    private static String VAULT_VERSION = "1.15.3";  // The vault version this test is supposed to run against.
     private static final String KEY1 = "E38bkCm0VhUvpdCKGQpcohhD9XmcHJ/2hreOSY019Lho";
     private static final String KEY2 = "O5OHwDleY3IiPdgw61cgHlhsrEm6tVJkrxhF6QAnILd1";
     private static final String KEY3 = "mw7Bm3nbt/UWa/juDjjL2EPQ04kiJ0saC5JEXwJvXYsB";