diff --git a/README.md b/README.md
index b9e31cd..746878b 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ A Web Push library for Java 8. Supports payloads and VAPID.
 For Gradle, add the following dependency to `build.gradle`:
 
 ```groovy
-compile group: 'nl.martijndwars', name: 'web-push', version: '5.1.1'
+compile group: 'nl.martijndwars', name: 'web-push', version: '5.1.2'
 ```
 
 For Maven, add the following dependency to `pom.xml`:
@@ -19,7 +19,7 @@ For Maven, add the following dependency to `pom.xml`:
 <dependency>
     <groupId>nl.martijndwars</groupId>
     <artifactId>web-push</artifactId>
-    <version>5.1.1</version>
+    <version>5.1.2</version>
 </dependency>
 ```
 
diff --git a/build.gradle b/build.gradle
index 23dbe59..83ca068 100644
--- a/build.gradle
+++ b/build.gradle
@@ -12,7 +12,7 @@ apply plugin: 'application'
 apply plugin: 'com.github.johnrengelman.shadow'
 
 group 'nl.martijndwars'
-version '5.1.2-SNAPSHOT'
+version '5.1.2'
 
 repositories {
     mavenLocal()
@@ -27,13 +27,13 @@ dependencies {
     implementation group: 'org.apache.httpcomponents', name: 'httpasyncclient', version: '4.1.5'
 
     // For making async HTTP requests
-    implementation group: 'org.asynchttpclient', name: 'async-http-client', version: '2.12.3'
+    implementation group: 'org.asynchttpclient', name: 'async-http-client', version: '2.12.4'
 
     // For cryptographic operations
     shadow group: 'org.bouncycastle', name: 'bcprov-jdk15on', version: '1.70'
 
     // For creating and signing JWT
-    implementation group: 'org.bitbucket.b_c', name: 'jose4j', version: '0.7.9'
+    implementation group: 'org.bitbucket.b_c', name: 'jose4j', version: '0.9.6'
 
     // For parsing JSON
     testImplementation group: 'com.google.code.gson', name: 'gson', version: '2.8.9'
@@ -54,7 +54,7 @@ dependencies {
     testImplementation group: 'org.bouncycastle', name: 'bcpkix-jdk15on', version: '1.70'
 
     // For verifying Base64Encoder results in unit tests
-    testImplementation group: 'com.google.guava', name: 'guava', version: '31.0.1-jre'
+    testImplementation group: 'com.google.guava', name: 'guava', version: '33.4.8-jre'
 }
 
 wrapper {
diff --git a/src/main/java/nl/martijndwars/webpush/AbstractPushService.java b/src/main/java/nl/martijndwars/webpush/AbstractPushService.java
index 22db83b..f3f25ed 100644
--- a/src/main/java/nl/martijndwars/webpush/AbstractPushService.java
+++ b/src/main/java/nl/martijndwars/webpush/AbstractPushService.java
@@ -166,7 +166,7 @@ protected final HttpRequest prepareRequest(Notification notification, Encoding e
             } else if (encoding == Encoding.AESGCM) {
                 headers.put("Content-Encoding", "aesgcm");
                 headers.put("Encryption", "salt=" + Base64.getUrlEncoder().withoutPadding().encodeToString(salt));
-                headers.put("Crypto-Key", "dh=" + Base64.getUrlEncoder().encodeToString(dh));
+                headers.put("Crypto-Key", "dh=" + Base64.getUrlEncoder().withoutPadding().encodeToString(dh));
             }
 
             body = encrypted.getCiphertext();
@@ -208,9 +208,9 @@ protected final HttpRequest prepareRequest(Notification notification, Encoding e
             }
 
             if (headers.containsKey("Crypto-Key")) {
-                headers.put("Crypto-Key", headers.get("Crypto-Key") + ";p256ecdsa=" + Base64.getUrlEncoder().encodeToString(pk));
+                headers.put("Crypto-Key", headers.get("Crypto-Key") + ";p256ecdsa=" + Base64.getUrlEncoder().withoutPadding().encodeToString(pk));
             } else {
-                headers.put("Crypto-Key", "p256ecdsa=" + Base64.getUrlEncoder().encodeToString(pk));
+                headers.put("Crypto-Key", "p256ecdsa=" + Base64.getUrlEncoder().withoutPadding().encodeToString(pk));
             }
         } else if (notification.isFcm() && getGcmApiKey() != null) {
             headers.put("Authorization", "key=" + getGcmApiKey());
diff --git a/src/main/java/nl/martijndwars/webpush/PushService.java b/src/main/java/nl/martijndwars/webpush/PushService.java
index cd117dc..e15647b 100644
--- a/src/main/java/nl/martijndwars/webpush/PushService.java
+++ b/src/main/java/nl/martijndwars/webpush/PushService.java
@@ -65,7 +65,7 @@ public HttpResponse send(Notification notification, Encoding encoding) throws Ge
     }
 
     public HttpResponse send(Notification notification) throws GeneralSecurityException, IOException, JoseException, ExecutionException, InterruptedException {
-        return send(notification, Encoding.AESGCM);
+        return send(notification, Encoding.AES128GCM);
     }
 
     /**
diff --git a/src/main/java/nl/martijndwars/webpush/cli/handlers/GenerateKeyHandler.java b/src/main/java/nl/martijndwars/webpush/cli/handlers/GenerateKeyHandler.java
index 6ddf519..1747adf 100644
--- a/src/main/java/nl/martijndwars/webpush/cli/handlers/GenerateKeyHandler.java
+++ b/src/main/java/nl/martijndwars/webpush/cli/handlers/GenerateKeyHandler.java
@@ -42,10 +42,10 @@ public void run() throws InvalidAlgorithmParameterException, NoSuchAlgorithmExce
         }
 
         System.out.println("PublicKey:");
-        System.out.println(Base64.getUrlEncoder().encodeToString(encodedPublicKey));
+        System.out.println(Base64.getUrlEncoder().withoutPadding().encodeToString(encodedPublicKey));
 
         System.out.println("PrivateKey:");
-        System.out.println(Base64.getUrlEncoder().encodeToString(encodedPrivateKey));
+        System.out.println(Base64.getUrlEncoder().withoutPadding().encodeToString(encodedPrivateKey));
     }
 
     /**