diff --git a/module/spring-boot-grpc-client/src/main/java/org/springframework/boot/grpc/client/autoconfigure/ServiceConfig.java b/module/spring-boot-grpc-client/src/main/java/org/springframework/boot/grpc/client/autoconfigure/ServiceConfig.java
index bc1749efb01..c7520906b23 100644
--- a/module/spring-boot-grpc-client/src/main/java/org/springframework/boot/grpc/client/autoconfigure/ServiceConfig.java
+++ b/module/spring-boot-grpc-client/src/main/java/org/springframework/boot/grpc/client/autoconfigure/ServiceConfig.java
@@ -189,7 +189,7 @@ public record ServiceConfig(@Nullable List<LoadBalancingConfig> loadbalancing, @
 		 */
 		public record WeightedRoundRobinLoadBalancingConfig(Duration blackoutPeriod, Duration weightExpirationPeriod,
 				Duration outOfBandReportingPeriod, Boolean enableOutOfBandLoadReport, Duration weightUpdatePeriod,
-				Float errorUtilizationPenalty) {
+				Double errorUtilizationPenalty) {
 
 			Map<String, Object> grpcJavaConfig() {
 				// Aligned with WeightedRoundRobinLoadBalancerProvider
@@ -208,7 +208,9 @@ public record ServiceConfig(@Nullable List<LoadBalancingConfig> loadbalancing, @
 				map.from(this::weightUpdatePeriod)
 					.as(ServiceConfig::durationString)
 					.to(grpcJavaConfig.in("weightUpdatePeriod"));
-				map.from(this::errorUtilizationPenalty).to(grpcJavaConfig.in("errorUtilizationPenalty"));
+				map.from(this::errorUtilizationPenalty)
+					.as(Object::toString)
+					.to(grpcJavaConfig.in("errorUtilizationPenalty"));
 				return grpcJavaConfig.asMap();
 			}
 
diff --git a/platform/spring-boot-dependencies/build.gradle b/platform/spring-boot-dependencies/build.gradle
index a6fe8b6a915..0518c385f2e 100644
--- a/platform/spring-boot-dependencies/build.gradle
+++ b/platform/spring-boot-dependencies/build.gradle
@@ -558,10 +558,16 @@ bom {
 			site("https://groovy-lang.org")
 		}
 	}
-	library("Grpc Java", "1.81.1") {
+	library("Grpc Java", "1.83.1") {
 		group("io.grpc") {
 			bom("grpc-bom")
 		}
+		alignWith {
+			version {
+				of "io.grpc:grpc-core"
+				from "org.springframework.grpc:spring-grpc-core"
+			}
+		}
 		links {
 			github("https://github.com/grpc/grpc-java")
 			docs("https://grpc.io/docs/languages/java/")