diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index 5a6823a..8e5a0a4 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -21,10 +21,10 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
-      - name: Set up JDK 21
+      - name: Set up JDK 17
         uses: actions/setup-java@v4
         with:
-          java-version: '21'
+          java-version: '17'
           distribution: 'temurin'
           cache: maven
       - name: Build with Maven
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 3d600d4..fcc92a2 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -14,10 +14,10 @@ jobs:
         with:
           fetch-depth: 0
 
-      - name: Set up JDK 21
+      - name: Set up JDK 17
         uses: actions/setup-java@v4
         with:
-          java-version: '21'
+          java-version: '17'
           distribution: 'temurin'
           cache: maven
 
diff --git a/README.md b/README.md
index 55a148b..0a7b9ca 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@
 
 <p align="center">
     <img src="https://github.com/enofex/taikai/actions/workflows/maven.yml/badge.svg" />
-    <img src="https://img.shields.io/badge/Java%20Version-21-orange" />
+    <img src="https://img.shields.io/badge/Java%20Version-17-orange" />
     <img height="20" src="https://sonarcloud.io/images/project_badges/sonarcloud-orange.svg">
 </p>
 
@@ -104,7 +104,7 @@ Interested in contributing? Check out our [Contribution Guidelines](https://gith
 ### What you will need
 
 * Git
-* Java 21 or higher
+* Java 17 or higher
 
 ### Get the Source Code
 
diff --git a/pom.xml b/pom.xml
index 908cb3a..76de252 100644
--- a/pom.xml
+++ b/pom.xml
@@ -21,7 +21,7 @@
   </description>
 
   <properties>
-    <java.version>21</java.version>
+    <java.version>17</java.version>
 
     <maven.compiler.source>${java.version}</maven.compiler.source>
     <maven.compiler.target>${java.version}</maven.compiler.target>
diff --git a/src/main/java/com/enofex/taikai/java/HashCodeAndEquals.java b/src/main/java/com/enofex/taikai/java/HashCodeAndEquals.java
index e573ead..081a876 100644
--- a/src/main/java/com/enofex/taikai/java/HashCodeAndEquals.java
+++ b/src/main/java/com/enofex/taikai/java/HashCodeAndEquals.java
@@ -38,7 +38,7 @@ private static boolean hasEquals(JavaClass javaClass) {
         return javaClass.getMethods().stream()
             .anyMatch(method -> "equals".equals(method.getName()) &&
                 method.getRawParameterTypes().size() == 1 &&
-                method.getRawParameterTypes().getFirst().getName().equals(Object.class.getName()));
+                method.getRawParameterTypes().get(0).getName().equals(Object.class.getName()));
       }
     };
   }
diff --git a/src/test/java/com/enofex/taikai/internal/ArchConditionsTest.java b/src/test/java/com/enofex/taikai/internal/ArchConditionsTest.java
index e252fe8..8810551 100644
--- a/src/test/java/com/enofex/taikai/internal/ArchConditionsTest.java
+++ b/src/test/java/com/enofex/taikai/internal/ArchConditionsTest.java
@@ -72,7 +72,7 @@ void shouldBePublicButNotStatic() {
     verify(this.events).add(eventCaptor.capture());
     assertEquals("Field %s in class %s is public".formatted(
             this.mockField.getName(), this.mockClass.getFullName()),
-        eventCaptor.getValue().getDescriptionLines().getFirst());
+        eventCaptor.getValue().getDescriptionLines().get(0));
   }
 
 
@@ -102,7 +102,7 @@ void shouldNotHaveRequiredModifiers() {
             this.mockField.getName(),
             this.mockClass.getFullName(),
             "PRIVATE, FINAL"),
-        eventCaptor.getValue().getDescriptionLines().getFirst());
+        eventCaptor.getValue().getDescriptionLines().get(0));
   }
 
   @Test
diff --git a/src/test/java/com/enofex/taikai/internal/DescribedPredicatesTest.java b/src/test/java/com/enofex/taikai/internal/DescribedPredicatesTest.java
index a464cdb..114f6db 100644
--- a/src/test/java/com/enofex/taikai/internal/DescribedPredicatesTest.java
+++ b/src/test/java/com/enofex/taikai/internal/DescribedPredicatesTest.java
@@ -51,8 +51,8 @@ void shouldReturnTrueWhenAnnotatedWithAllAnnotations() {
   void shouldReturnFalseWhenNotAnnotatedWithAllAnnotations() {
     Set<String> annotations = Set.of("MyAnnotation1", "MyAnnotation2");
 
-    when(this.canBeAnnotated.isAnnotatedWith("MyAnnotation1")).thenReturn(false);
-    when(this.canBeAnnotated.isAnnotatedWith("MyAnnotation2")).thenReturn(true);
+    when(this.canBeAnnotated.isAnnotatedWith("MyAnnotation1")).thenReturn(true);
+    when(this.canBeAnnotated.isAnnotatedWith("MyAnnotation2")).thenReturn(false);
 
     assertFalse(DescribedPredicates.annotatedWithAll(annotations, false).test(this.canBeAnnotated));
   }