diff --git a/pom.xml b/pom.xml
index a2e5ac9..f193862 100644
--- a/pom.xml
+++ b/pom.xml
@@ -27,32 +27,32 @@
 
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-		<java.version>8</java.version>
+		<java.version>17</java.version>
 	</properties>
 
 	<dependencies>
 		<dependency>
 			<groupId>org.springframework.security</groupId>
 			<artifactId>spring-security-crypto</artifactId>
-			<version>5.8.4</version>
+			<version>6.2.2</version>
 		</dependency>
 
 		<dependency>
 			<groupId>org.springframework</groupId>
 			<artifactId>spring-core</artifactId>
-			<version>5.3.28</version>
+			<version>6.1.5</version>
 		</dependency>
 
 		<dependency>
 			<groupId>org.bouncycastle</groupId>
 			<artifactId>bcprov-jdk18on</artifactId>
-			<version>1.74</version>
+			<version>1.77</version>
 		</dependency>
 
 		<dependency>
 			<groupId>junit</groupId>
 			<artifactId>junit</artifactId>
-			<version>4.13.1</version>
+			<version>4.13.2</version>
 			<scope>test</scope>
 		</dependency>
 
@@ -71,7 +71,7 @@
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-surefire-plugin</artifactId>
-					<version>2.22.2</version>
+					<version>3.2.5</version>
 					<configuration>
 						<skip>${skipTests}</skip>
 						<includes>
@@ -86,7 +86,7 @@
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-compiler-plugin</artifactId>
-				<version>3.10.1</version>
+				<version>3.12.1</version>
 				<configuration>
 					<source>${java.version}</source>
 					<target>${java.version}</target>
@@ -95,7 +95,7 @@
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-source-plugin</artifactId>
-				<version>3.2.1</version>
+				<version>3.3.0</version>
 				<executions>
 					<execution>
 						<id>attach-sources</id>
@@ -109,7 +109,7 @@
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-javadoc-plugin</artifactId>
-				<version>3.4.0</version>
+				<version>3.6.3</version>
 				<executions>
 					<execution>
 						<id>javadoc</id>
diff --git a/src/main/java/org/springframework/security/rsa/crypto/RsaRawEncryptor.java b/src/main/java/org/springframework/security/rsa/crypto/RsaRawEncryptor.java
index f2d9428..64ba95e 100644
--- a/src/main/java/org/springframework/security/rsa/crypto/RsaRawEncryptor.java
+++ b/src/main/java/org/springframework/security/rsa/crypto/RsaRawEncryptor.java
@@ -24,7 +24,6 @@
 import java.security.interfaces.RSAPublicKey;
 
 import javax.crypto.Cipher;
-import sun.security.rsa.RSACore;
 
 import org.springframework.security.crypto.encrypt.BytesEncryptor;
 import org.springframework.security.crypto.encrypt.TextEncryptor;
@@ -143,7 +142,9 @@ private static byte[] decrypt(byte[] text, RSAPrivateKey key, RsaAlgorithm alg)
 		ByteArrayOutputStream output = new ByteArrayOutputStream(text.length);
 		try {
 			final Cipher cipher = Cipher.getInstance(alg.getJceName());
-			int maxLength = RSACore.getByteLength(key);
+			// Calculation from RSACore.getByteLength(RSAKey key)
+			int n = key.getModulus().bitLength();
+			int maxLength = (n + 7) >> 3;
 			int pos = 0;
 			while (pos < text.length) {
 				int limit = Math.min(text.length - pos, maxLength);