diff --git a/.idea/misc.xml b/.idea/misc.xml
index fdc35ea..35f4d9b 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -8,7 +8,7 @@
       </list>
     </option>
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="21" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" default="true" project-jdk-name="corretto-11" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>
\ No newline at end of file
diff --git a/pom.xml b/pom.xml
index 6fb20d3..fe5dd51 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,11 +6,11 @@
 
     <groupId>me.finn.unlegitlibrary</groupId>
     <artifactId>unlegitlibrary</artifactId>
-    <version>1.3.1</version>
+    <version>1.3.1-OpenJDK11</version>
 
     <properties>
-        <maven.compiler.source>21</maven.compiler.source>
-        <maven.compiler.target>21</maven.compiler.target>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
 
diff --git a/src/main/java/me/finn/unlegitlibrary/addon/impl/AddonInfo.java b/src/main/java/me/finn/unlegitlibrary/addon/impl/AddonInfo.java
index 880b914..fd1c5c5 100644
--- a/src/main/java/me/finn/unlegitlibrary/addon/impl/AddonInfo.java
+++ b/src/main/java/me/finn/unlegitlibrary/addon/impl/AddonInfo.java
@@ -39,8 +39,8 @@ public class AddonInfo {
 
     @Override
     public boolean equals(Object obj) {
-        if (!(obj instanceof AddonInfo other)) return false;
-
+        if (!(obj instanceof AddonInfo)) return false;
+        AddonInfo other = (AddonInfo) obj;
         return other.name.equalsIgnoreCase(name) && other.version.equalsIgnoreCase(version) && other.author.equalsIgnoreCase(author);
     }
 
diff --git a/src/main/java/me/finn/unlegitlibrary/network/system/client/NetworkClient.java b/src/main/java/me/finn/unlegitlibrary/network/system/client/NetworkClient.java
index 4528888..dd72e7c 100644
--- a/src/main/java/me/finn/unlegitlibrary/network/system/client/NetworkClient.java
+++ b/src/main/java/me/finn/unlegitlibrary/network/system/client/NetworkClient.java
@@ -202,7 +202,8 @@ public class NetworkClient extends DefaultMethodsOverrider {
                     continue;
                 }
 
-                if (received instanceof Integer id) {
+                if (received instanceof Integer) {
+                    int id = (Integer) received;
                     if (command.equalsIgnoreCase("s2c_connect")) {
                         clientID = id;
                         command = "";
diff --git a/src/main/java/me/finn/unlegitlibrary/network/system/server/ClientHandler.java b/src/main/java/me/finn/unlegitlibrary/network/system/server/ClientHandler.java
index eaf55a4..0c7187b 100644
--- a/src/main/java/me/finn/unlegitlibrary/network/system/server/ClientHandler.java
+++ b/src/main/java/me/finn/unlegitlibrary/network/system/server/ClientHandler.java
@@ -127,7 +127,8 @@ public class ClientHandler {
                     continue;
                 }
 
-                if (received instanceof Integer id) {
+                if (received instanceof Integer) {
+                    int id = (Integer) received;
                     if (command.equalsIgnoreCase("c2s_connect")) {
                         if (clientID == id) continue;
                         command = "";
diff --git a/src/main/java/me/finn/unlegitlibrary/number/Quaternion.java b/src/main/java/me/finn/unlegitlibrary/number/Quaternion.java
index 88f782a..94623ad 100644
--- a/src/main/java/me/finn/unlegitlibrary/number/Quaternion.java
+++ b/src/main/java/me/finn/unlegitlibrary/number/Quaternion.java
@@ -76,7 +76,8 @@ public class Quaternion {
 
     @Override
     public final boolean equals(Object obj) {
-        if (!(obj instanceof Quaternion quaternion)) return false;
+        if (!(obj instanceof Quaternion)) return false;
+        Quaternion quaternion = (Quaternion) obj;
         return quaternion.x == x && quaternion.y == y && quaternion.z == z && quaternion.w == w;
     }
 
diff --git a/src/main/java/me/finn/unlegitlibrary/number/vector/Vector2.java b/src/main/java/me/finn/unlegitlibrary/number/vector/Vector2.java
index 2c74424..dee07d9 100644
--- a/src/main/java/me/finn/unlegitlibrary/number/vector/Vector2.java
+++ b/src/main/java/me/finn/unlegitlibrary/number/vector/Vector2.java
@@ -100,7 +100,8 @@ public class Vector2 {
 
     @Override
     public final boolean equals(Object obj) {
-        if (!(obj instanceof Vector2 vector2)) return false;
+        if (!(obj instanceof Vector2)) return false;
+        Vector2 vector2 = (Vector2) obj;
         return vector2.x == x && vector2.y == y;
     }
 
diff --git a/src/main/java/me/finn/unlegitlibrary/number/vector/Vector3.java b/src/main/java/me/finn/unlegitlibrary/number/vector/Vector3.java
index e9d8ef5..d412c51 100644
--- a/src/main/java/me/finn/unlegitlibrary/number/vector/Vector3.java
+++ b/src/main/java/me/finn/unlegitlibrary/number/vector/Vector3.java
@@ -124,7 +124,8 @@ public class Vector3 {
 
     @Override
     public final boolean equals(Object obj) {
-        if (!(obj instanceof Vector3 vector3)) return false;
+        if (!(obj instanceof Vector3)) return false;
+        Vector3 vector3 = (Vector3) obj;
         return vector3.x == x && vector3.y == y && vector3.z == z;
     }