diff --git a/build.gradle.kts b/build.gradle.kts
index 802c93f..298a2cf 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -15,13 +15,7 @@ dependencies {
 
     implementation("com.fasterxml.jackson.datatype:jackson-datatype-jsr310")
     compileOnly("io.micrometer:micrometer-core:latest.release")
-    implementation("com.fasterxml.jackson.module:jackson-module-parameter-names:2.17.2")
-    // Blackbird generates LambdaMetafactory-backed property accessors so
-    // Jackson skips the reflective MethodHandle path. ~1.5-2x on real RPC
-    // traffic per a JMH bench replaying a captured trace from `mod run`
-    // org.openrewrite.node.migrate.upgrade-node-24 — measurable on the
-    // GetObject deserialize path where field counts in nested Maps are high.
-    implementation("com.fasterxml.jackson.module:jackson-module-blackbird:2.17.2")
+    implementation("com.fasterxml.jackson.module:jackson-module-parameter-names:2.21.1")
     testImplementation("org.openrewrite:rewrite-test:latest.release")
 }
 
diff --git a/src/main/java/io/moderne/jsonrpc/formatter/JsonMessageFormatter.java b/src/main/java/io/moderne/jsonrpc/formatter/JsonMessageFormatter.java
index 60ac3fa..1b7c9de 100644
--- a/src/main/java/io/moderne/jsonrpc/formatter/JsonMessageFormatter.java
+++ b/src/main/java/io/moderne/jsonrpc/formatter/JsonMessageFormatter.java
@@ -25,7 +25,6 @@
 import com.fasterxml.jackson.databind.json.JsonMapper;
 import com.fasterxml.jackson.databind.util.TokenBuffer;
 import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
-import com.fasterxml.jackson.module.blackbird.BlackbirdModule;
 import com.fasterxml.jackson.module.paramnames.ParameterNamesModule;
 import io.moderne.jsonrpc.JsonRpcError;
 import io.moderne.jsonrpc.JsonRpcMessage;
@@ -48,7 +47,7 @@ public JsonMessageFormatter() {
                 // see https://cowtowncoder.medium.com/jackson-2-12-most-wanted-3-5-246624e2d3d0
                 .constructorDetector(ConstructorDetector.USE_PROPERTIES_BASED)
                 .build()
-                .registerModules(new ParameterNamesModule(), new JavaTimeModule(), new BlackbirdModule())
+                .registerModules(new ParameterNamesModule(), new JavaTimeModule())
                 .disable(SerializationFeature.FAIL_ON_EMPTY_BEANS)
                 .setSerializationInclusion(JsonInclude.Include.NON_NULL));
         mapper.setVisibility(mapper.getSerializationConfig().getDefaultVisibilityChecker()
@@ -62,7 +61,7 @@ public JsonMessageFormatter(com.fasterxml.jackson.databind.Module... modules) {
         this(JsonMapper.builder()
                 .constructorDetector(ConstructorDetector.USE_PROPERTIES_BASED)
                 .build()
-                .registerModules(new ParameterNamesModule(), new JavaTimeModule(), new BlackbirdModule())
+                .registerModules(new ParameterNamesModule(), new JavaTimeModule())
                 .registerModules(modules)
                 .disable(SerializationFeature.FAIL_ON_EMPTY_BEANS)
                 .setSerializationInclusion(JsonInclude.Include.NON_NULL));