diff --git a/langchain4j-core/src/main/java/dev/langchain4j/internal/RetryUtils.java b/langchain4j-core/src/main/java/dev/langchain4j/internal/RetryUtils.java
index e6657ab6d95..8cbf9193ee9 100644
--- a/langchain4j-core/src/main/java/dev/langchain4j/internal/RetryUtils.java
+++ b/langchain4j-core/src/main/java/dev/langchain4j/internal/RetryUtils.java
@@ -1,5 +1,6 @@
 package dev.langchain4j.internal;
 
+import java.security.SecureRandom;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -143,7 +144,7 @@ public double rawDelayMs(int attempt) {
          * @return The jitter delay in milliseconds.
          */
         public int jitterDelayMillis(int attempt) {
-            Random rand = new Random();
+            Random rand = new SecureRandom();
             double delay = rawDelayMs(attempt);
             double jitter = delay * jitterScale;
             return (int) (delay + rand.nextInt((int) jitter));
diff --git a/langchain4j-vertex-ai/src/test/java/dev/langchain4j/model/vertexai/VertexAiEmbeddingModelIT.java b/langchain4j-vertex-ai/src/test/java/dev/langchain4j/model/vertexai/VertexAiEmbeddingModelIT.java
index 588100d144b..ae9720b5c36 100644
--- a/langchain4j-vertex-ai/src/test/java/dev/langchain4j/model/vertexai/VertexAiEmbeddingModelIT.java
+++ b/langchain4j-vertex-ai/src/test/java/dev/langchain4j/model/vertexai/VertexAiEmbeddingModelIT.java
@@ -5,6 +5,7 @@
 import dev.langchain4j.model.embedding.EmbeddingModel;
 import dev.langchain4j.model.output.Response;
 import dev.langchain4j.model.output.TokenUsage;
+import java.security.SecureRandom;
 import org.junit.jupiter.api.Test;
 
 import java.util.Arrays;
@@ -96,7 +97,7 @@ private static List<TextSegment> createRandomSegments(int count, int maxLength)
         for (int i = 0; i < count; i++) {
             StringBuilder sb = new StringBuilder();
             do {
-                String nextWord = words[new Random().nextInt(words.length)];
+                String nextWord = words[new SecureRandom().nextInt(words.length)];
                 if (sb.length() + nextWord.length() + 1 < maxLength) {
                     sb.append(nextWord).append(" ");
                 } else break;
@@ -162,4 +163,4 @@ void testBatchingEmbeddingsWithMaxSet() {
 
         assertThat(embeddings.size()).isEqualTo(1234);
     }
-}
\ No newline at end of file
+}