diff --git a/openapi-request-validator-core/src/main/java/com/atlassian/oai/validator/schema/SchemaValidator.java b/openapi-request-validator-core/src/main/java/com/atlassian/oai/validator/schema/SchemaValidator.java
index 30c55c50..08122b15 100644
--- a/openapi-request-validator-core/src/main/java/com/atlassian/oai/validator/schema/SchemaValidator.java
+++ b/openapi-request-validator-core/src/main/java/com/atlassian/oai/validator/schema/SchemaValidator.java
@@ -19,6 +19,7 @@
 import com.github.benmanes.caffeine.cache.Caffeine;
 import com.github.benmanes.caffeine.cache.LoadingCache;
 import com.networknt.schema.Error;
+import com.networknt.schema.InputFormat;
 import com.networknt.schema.InvalidSchemaException;
 import com.networknt.schema.SchemaRegistry;
 import com.networknt.schema.SchemaRegistryConfig;
@@ -41,6 +42,7 @@
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 import java.io.IOException;
+import java.io.UncheckedIOException;
 import java.time.LocalDateTime;
 import java.time.format.DateTimeFormatter;
 import java.time.format.DateTimeParseException;
@@ -142,7 +144,7 @@ public SchemaValidator(@Nonnull final OpenAPI api,
                                 key.forResponse,
                                 definitions
                         );
-                        return schemaRegistry.getSchema(schemaObject);
+                        return schemaRegistry.getSchema(writeAsString(schemaObject), InputFormat.JSON);
                     });
         } else {
             this.jsonSchemaCache = null;
@@ -239,7 +241,8 @@ public ValidationReport validate(@Nonnull final JsonNodeSupplier supplier,
 
         try {
             final com.networknt.schema.Schema resolvedJsonSchema = resolveJsonSchema(schema, keyPrefix);
-            final List<Error> validationMessages = resolvedJsonSchema.validate(supplier.get());
+            final List<Error> validationMessages =
+                    resolvedJsonSchema.validate(writeAsString(supplier.get()), InputFormat.JSON);
             return messageConverter.toValidationReport(validationMessages, keyPrefix);
         } catch (final InvalidSchemaException e) {
             return ValidationReport.singleton(
@@ -265,7 +268,7 @@ private com.networknt.schema.Schema resolveJsonSchema(final Schema<?> schema,
                 return jsonSchemaCache.get(jsonSchemaKey);
             }
             final JsonNode schemaObject = readAndTransformSchemaObject(schema, forRequest, forResponse, definitions);
-            return schemaRegistry.getSchema(schemaObject);
+            return schemaRegistry.getSchema(writeAsString(schemaObject), InputFormat.JSON);
         } catch (final Exception e) {
             // TODO: Need to handle this exception
             throw new RuntimeException("JsonSchema construction failed", e);
@@ -294,6 +297,22 @@ private JsonNode readAndTransformSchemaObject(final Schema<?> schema,
         return schemaObject;
     }
 
+    /**
+     * Serialize a (Jackson 2) JSON node to a JSON string.
+     * <p>
+     * swagger-core / swagger-parser produce Jackson 2 nodes, whereas networknt 3.x consumes Jackson 3.
+     * Rather than leak Jackson 2 nodes into networknt (which removed the Jackson 2 node overloads),
+     * the schema and the instance being validated are handed to networknt as JSON text via its
+     * {@link InputFormat#JSON} entry points.
+     */
+    private String writeAsString(final JsonNode node) {
+        try {
+            return (isOpenApi30 ? Json.mapper() : Json31.mapper()).writeValueAsString(node);
+        } catch (final IOException e) {
+            throw new UncheckedIOException("Failed to serialize JSON node", e);
+        }
+    }
+
     private boolean additionalPropertiesValidationEnabled() {
         return !messages.isIgnored(ADDITIONAL_PROPERTIES_KEY);
     }
diff --git a/openapi-request-validator-core/src/main/java/com/atlassian/oai/validator/schema/format/DoubleFormat.java b/openapi-request-validator-core/src/main/java/com/atlassian/oai/validator/schema/format/DoubleFormat.java
index 6b38b88a..b94303f5 100644
--- a/openapi-request-validator-core/src/main/java/com/atlassian/oai/validator/schema/format/DoubleFormat.java
+++ b/openapi-request-validator-core/src/main/java/com/atlassian/oai/validator/schema/format/DoubleFormat.java
@@ -1,12 +1,12 @@
 package com.atlassian.oai.validator.schema.format;
 
-import com.fasterxml.jackson.databind.JsonNode;
-import com.fasterxml.jackson.databind.node.NumericNode;
 import com.networknt.schema.ExecutionContext;
 import com.networknt.schema.SchemaContext;
 import com.networknt.schema.format.Format;
 import com.networknt.schema.utils.JsonType;
 import com.networknt.schema.utils.TypeFactory;
+import tools.jackson.databind.JsonNode;
+import tools.jackson.databind.node.NumericNode;
 
 import java.math.BigDecimal;
 
diff --git a/openapi-request-validator-core/src/main/java/com/atlassian/oai/validator/schema/format/FloatFormat.java b/openapi-request-validator-core/src/main/java/com/atlassian/oai/validator/schema/format/FloatFormat.java
index 15dbad0d..31d20b80 100644
--- a/openapi-request-validator-core/src/main/java/com/atlassian/oai/validator/schema/format/FloatFormat.java
+++ b/openapi-request-validator-core/src/main/java/com/atlassian/oai/validator/schema/format/FloatFormat.java
@@ -1,12 +1,14 @@
 package com.atlassian.oai.validator.schema.format;
 
-import com.fasterxml.jackson.databind.JsonNode;
-import com.fasterxml.jackson.databind.node.NumericNode;
 import com.networknt.schema.ExecutionContext;
 import com.networknt.schema.SchemaContext;
 import com.networknt.schema.format.Format;
 import com.networknt.schema.utils.JsonType;
 import com.networknt.schema.utils.TypeFactory;
+import tools.jackson.databind.JsonNode;
+import tools.jackson.databind.node.NumericNode;
+
+import java.math.BigDecimal;
 
 public class FloatFormat implements Format {
     @Override
@@ -33,8 +35,15 @@ public boolean matches(final ExecutionContext executionContext, final SchemaCont
             return false;
         }
 
-        final float f = numericValue.floatValue();
-        final String original = String.valueOf(numericValue.decimalValue());
+        final BigDecimal dec = numericValue.decimalValue();
+        // Derive the float from the decimal: BigDecimal#floatValue() yields Infinity on overflow,
+        // whereas NumericNode#floatValue() throws in Jackson 3 when the value is out of float range.
+        final float f = dec.floatValue();
+        if (Float.isInfinite(f) || Float.isNaN(f)) {
+            return false;
+        }
+
+        final String original = String.valueOf(dec);
         final String parsed = String.valueOf(f);
 
         return original.equals(parsed);
diff --git a/openapi-request-validator-core/src/main/java/com/atlassian/oai/validator/schema/format/Int32Format.java b/openapi-request-validator-core/src/main/java/com/atlassian/oai/validator/schema/format/Int32Format.java
index 348d0d5f..8ad0e7bf 100644
--- a/openapi-request-validator-core/src/main/java/com/atlassian/oai/validator/schema/format/Int32Format.java
+++ b/openapi-request-validator-core/src/main/java/com/atlassian/oai/validator/schema/format/Int32Format.java
@@ -1,11 +1,11 @@
 package com.atlassian.oai.validator.schema.format;
 
-import com.fasterxml.jackson.databind.JsonNode;
 import com.networknt.schema.ExecutionContext;
 import com.networknt.schema.SchemaContext;
 import com.networknt.schema.format.Format;
 import com.networknt.schema.utils.JsonType;
 import com.networknt.schema.utils.TypeFactory;
+import tools.jackson.databind.JsonNode;
 
 public class Int32Format implements Format {
     @Override
diff --git a/openapi-request-validator-core/src/main/java/com/atlassian/oai/validator/schema/format/Int64Format.java b/openapi-request-validator-core/src/main/java/com/atlassian/oai/validator/schema/format/Int64Format.java
index 21222a15..388e49ea 100644
--- a/openapi-request-validator-core/src/main/java/com/atlassian/oai/validator/schema/format/Int64Format.java
+++ b/openapi-request-validator-core/src/main/java/com/atlassian/oai/validator/schema/format/Int64Format.java
@@ -1,11 +1,11 @@
 package com.atlassian.oai.validator.schema.format;
 
-import com.fasterxml.jackson.databind.JsonNode;
 import com.networknt.schema.ExecutionContext;
 import com.networknt.schema.SchemaContext;
 import com.networknt.schema.format.Format;
 import com.networknt.schema.utils.JsonType;
 import com.networknt.schema.utils.TypeFactory;
+import tools.jackson.databind.JsonNode;
 
 public class Int64Format implements Format {
     @Override
diff --git a/openapi-request-validator-core/src/main/java/com/atlassian/oai/validator/util/OpenApiLoader.java b/openapi-request-validator-core/src/main/java/com/atlassian/oai/validator/util/OpenApiLoader.java
index 6adabba0..cc6b2084 100644
--- a/openapi-request-validator-core/src/main/java/com/atlassian/oai/validator/util/OpenApiLoader.java
+++ b/openapi-request-validator-core/src/main/java/com/atlassian/oai/validator/util/OpenApiLoader.java
@@ -136,7 +136,7 @@ private static void removeTypeObjectAssociationWithOneOfAndAnyOfFromSchema(@Nonn
      * Removes the Base64 pattern on the {@link OpenAPI} model.
      * <p>
      * If that pattern would stay on the model all fields of type string / byte would be validated twice. Once
-     * with the {@link com.networknt.schema.PatternValidator} and once with
+     * with the {@link com.networknt.schema.keyword.PatternValidator} and once with
      * the {@link com.atlassian.oai.validator.schema.format.Base64Format}.
      * To improve validation performance and memory footprint the pattern on string / byte fields will be
      * removed - so the PatternValidator will not be triggered for those kind of fields.
diff --git a/openapi-request-validator-core/src/test/java/com/atlassian/oai/validator/schema/SchemaValidatorTest.java b/openapi-request-validator-core/src/test/java/com/atlassian/oai/validator/schema/SchemaValidatorTest.java
index ac31dcff..87342eee 100644
--- a/openapi-request-validator-core/src/test/java/com/atlassian/oai/validator/schema/SchemaValidatorTest.java
+++ b/openapi-request-validator-core/src/test/java/com/atlassian/oai/validator/schema/SchemaValidatorTest.java
@@ -165,8 +165,11 @@ public void validate_withInvalidDoubleFormat_shouldFail() {
         final String value = "1" + Double.MAX_VALUE;
         final Schema schema = new NumberSchema().format("double");
 
+        // A value outside the double range cannot be represented as a JSON number that the
+        // validator accepts: networknt 3.x rejects it as a type error ("number expected") before
+        // the custom double-format validator is reached. The value is still rejected.
         assertFailWithoutContext(classUnderTest.validate(value, schema, "prefix"),
-                "validation.prefix.schema.format.double");
+                "validation.prefix.schema.type");
     }
 
     @Test
diff --git a/openapi-request-validator-core/src/test/java/com/atlassian/oai/validator/v31analysis/NetworkntDirectProbeTest.java b/openapi-request-validator-core/src/test/java/com/atlassian/oai/validator/v31analysis/NetworkntDirectProbeTest.java
index 1979ebc3..278433b9 100644
--- a/openapi-request-validator-core/src/test/java/com/atlassian/oai/validator/v31analysis/NetworkntDirectProbeTest.java
+++ b/openapi-request-validator-core/src/test/java/com/atlassian/oai/validator/v31analysis/NetworkntDirectProbeTest.java
@@ -1,6 +1,6 @@
 package com.atlassian.oai.validator.v31analysis;
 
-import com.fasterxml.jackson.databind.ObjectMapper;
+import com.networknt.schema.InputFormat;
 import com.networknt.schema.SchemaRegistry;
 import com.networknt.schema.dialect.Dialects;
 import org.junit.jupiter.api.Test;
@@ -19,13 +19,11 @@ public class NetworkntDirectProbeTest {
 
     private static final Logger LOG = LoggerFactory.getLogger(NetworkntDirectProbeTest.class);
 
-    private static final ObjectMapper MAPPER = new ObjectMapper();
     private static final SchemaRegistry REGISTRY = SchemaRegistry.withDefaultDialect(Dialects.getOpenApi31());
 
     private static int validate(final String schemaJson, final String input) throws Exception {
         final var schema = REGISTRY.getSchema(schemaJson);
-        final var node = MAPPER.readTree(input);
-        final var errs = schema.validate(node);
+        final var errs = schema.validate(input, InputFormat.JSON);
         errs.forEach(e -> LOG.error("  - {}", e));
         return errs.size();
     }
@@ -138,8 +136,7 @@ void discriminator_with_mapping_via_oas31_metaschema() throws Exception {
                 + "}";
 
         final var s = REGISTRY.getSchema(schema);
-        final var node = MAPPER.readTree("{\"kind\":\"circle\",\"radius\":5}");
-        final var errs = s.validate(node);
+        final var errs = s.validate("{\"kind\":\"circle\",\"radius\":5}", InputFormat.JSON);
         errs.forEach(e -> LOG.error("    - {}", e));
         LOG.error("[direct/discriminator+mapping circle] errors: {}", errs.size());
     }
diff --git a/openapi-request-validator-core/src/test/java/com/atlassian/oai/validator/v31analysis/UnevaluatedDeepProbeTest.java b/openapi-request-validator-core/src/test/java/com/atlassian/oai/validator/v31analysis/UnevaluatedDeepProbeTest.java
index 1a87b43b..ad98f027 100644
--- a/openapi-request-validator-core/src/test/java/com/atlassian/oai/validator/v31analysis/UnevaluatedDeepProbeTest.java
+++ b/openapi-request-validator-core/src/test/java/com/atlassian/oai/validator/v31analysis/UnevaluatedDeepProbeTest.java
@@ -1,6 +1,6 @@
 package com.atlassian.oai.validator.v31analysis;
 
-import com.fasterxml.jackson.databind.ObjectMapper;
+import com.networknt.schema.InputFormat;
 import com.networknt.schema.SchemaRegistry;
 import com.networknt.schema.dialect.Dialects;
 import org.junit.jupiter.api.Test;
@@ -14,15 +14,13 @@
 public class UnevaluatedDeepProbeTest {
 
     private static final Logger LOG = LoggerFactory.getLogger(UnevaluatedDeepProbeTest.class);
-    private static final ObjectMapper MAPPER = new ObjectMapper();
 
     private static int run(final String label,
                            final SchemaRegistry registry,
                            final String schemaJson,
                            final String input) throws Exception {
         final var schema = registry.getSchema(schemaJson);
-        final var node = MAPPER.readTree(input);
-        final var errs = schema.validate(node);
+        final var errs = schema.validate(input, InputFormat.JSON);
         LOG.error("[{}] errors: {}", label, errs.size());
         errs.forEach(e -> LOG.error("    - {}", e));
         return errs.size();
diff --git a/pom.xml b/pom.xml
index 481987ae..1ce85005 100644
--- a/pom.xml
+++ b/pom.xml
@@ -58,7 +58,10 @@
         <hamcrest.version>3.0</hamcrest.version>
         <hamcrest-optional.version>1.3.2</hamcrest-optional.version>
         <jackson.version>2.21.3</jackson.version>
-        <networknt-validator.version>2.0.1</networknt-validator.version>
+        <!-- Jackson 3 is consumed by networknt json-schema-validator 3.x and referenced directly
+             by the custom Format validators. Keep aligned with the version networknt depends on. -->
+        <jackson3.version>3.1.1</jackson3.version>
+        <networknt-validator.version>3.0.4</networknt-validator.version>
         <jsr305.version>3.0.2</jsr305.version>
         <logback.version>1.5.32</logback.version>
         <mockito.version>5.23.0</mockito.version>
@@ -375,6 +378,13 @@
                 <scope>import</scope>
                 <type>pom</type>
             </dependency>
+            <dependency>
+                <groupId>tools.jackson</groupId>
+                <artifactId>jackson-bom</artifactId>
+                <version>${jackson3.version}</version>
+                <scope>import</scope>
+                <type>pom</type>
+            </dependency>
             <dependency>
                 <groupId>javax.servlet</groupId>
                 <artifactId>javax.servlet-api</artifactId>