diff --git a/javaee/rt/build.gradle b/javaee/rt/build.gradle
index 8d9bba36c..06915cb89 100644
--- a/javaee/rt/build.gradle
+++ b/javaee/rt/build.gradle
@@ -3,7 +3,7 @@ apply plugin: 'java-library'
 dependencies {
     implementation project(':api')
 
-    implementation 'org.bouncycastle:bcprov-jdk18on:1.77'
+    implementation 'org.bouncycastle:bcprov-jdk18on:1.78.1'
     implementation 'org.msgpack:msgpack-core:0.8.17'
     implementation 'org.slf4j:slf4j-api:1.7.26'
     implementation 'org.ow2.asm:asm:7.3.1'
diff --git a/javaee/rt/src/java/s/java/math/BigInteger.java b/javaee/rt/src/java/s/java/math/BigInteger.java
index c79ef851e..46ac4f46a 100644
--- a/javaee/rt/src/java/s/java/math/BigInteger.java
+++ b/javaee/rt/src/java/s/java/math/BigInteger.java
@@ -401,7 +401,7 @@ private boolean isValidRange(java.math.BigInteger u) {
     }
 
     private void verifyBitLength(int length) {
-        if (length > 512) {
+        if (Math.abs(length) > 512) {
             throw new ArithmeticException("Out of the supported range");
         }
     }
diff --git a/sdk/java/library/build.gradle b/sdk/java/library/build.gradle
index bf95eb47f..25cd91496 100644
--- a/sdk/java/library/build.gradle
+++ b/sdk/java/library/build.gradle
@@ -9,7 +9,7 @@ java {
 sourceSets.main.java.srcDirs = ["src/main/java"]
 
 ext {
-    bouncycastleVersion = '1.77'
+    bouncycastleVersion = '1.78.1'
     jacksonVersion = '2.13.4.2'
     okhttpVersion = '4.10.0'
 }