diff --git a/core/pom.xml b/core/pom.xml
index 6eca7584d..85194c8b6 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -1,17 +1,17 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
-    
+
     <parent>
         <groupId>io.smallrye</groupId>
         <artifactId>smallrye-open-api-parent</artifactId>
         <version>3.7.1-SNAPSHOT</version>
     </parent>
-    
+
     <artifactId>smallrye-open-api-core</artifactId>
 
     <name>SmallRye: OpenAPI Core</name>
-    
+
     <properties>
         <!-- Excluded model classes for duplication checks (getters/setters treated as duplicates by Sonar) -->
         <sonar.cpd.exclusions>src/main/java/io/smallrye/openapi/api/models/**/*.java</sonar.cpd.exclusions>
@@ -71,12 +71,6 @@
             <artifactId>smallrye-config</artifactId>
             <scope>test</scope>
         </dependency>
-        <dependency>
-            <groupId>commons-io</groupId>
-            <artifactId>commons-io</artifactId>
-            <version>2.14.0</version>
-            <scope>test</scope>
-        </dependency>
         <dependency>
             <groupId>org.skyscreamer</groupId>
             <artifactId>jsonassert</artifactId>
diff --git a/core/src/test/java/io/smallrye/openapi/api/util/FilterUtilTest.java b/core/src/test/java/io/smallrye/openapi/api/util/FilterUtilTest.java
index 51d9fb55e..0a7d41738 100644
--- a/core/src/test/java/io/smallrye/openapi/api/util/FilterUtilTest.java
+++ b/core/src/test/java/io/smallrye/openapi/api/util/FilterUtilTest.java
@@ -1,11 +1,10 @@
 package io.smallrye.openapi.api.util;
 
+import static io.smallrye.openapi.runtime.scanner.IndexScannerTestBase.loadResource;
 import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
 
-import java.io.IOException;
 import java.net.URL;
 
-import org.apache.commons.io.IOUtils;
 import org.eclipse.microprofile.config.Config;
 import org.eclipse.microprofile.config.ConfigProvider;
 import org.eclipse.microprofile.openapi.OASFactory;
@@ -30,16 +29,6 @@
  */
 class FilterUtilTest {
 
-    /**
-     * Loads a resource as a string (reads the content at the URL).
-     *
-     * @param testResource
-     * @throws IOException
-     */
-    private static String loadResource(URL testResource) throws IOException {
-        return IOUtils.toString(testResource, "UTF-8");
-    }
-
     /**
      * Compares two JSON strings.
      *
diff --git a/core/src/test/java/io/smallrye/openapi/api/util/MergeUtilTest.java b/core/src/test/java/io/smallrye/openapi/api/util/MergeUtilTest.java
index d576e334b..aa0bfcbb4 100644
--- a/core/src/test/java/io/smallrye/openapi/api/util/MergeUtilTest.java
+++ b/core/src/test/java/io/smallrye/openapi/api/util/MergeUtilTest.java
@@ -1,10 +1,11 @@
 package io.smallrye.openapi.api.util;
 
+import static io.smallrye.openapi.runtime.scanner.IndexScannerTestBase.loadResource;
+
 import java.io.IOException;
 import java.net.URL;
 import java.text.ParseException;
 
-import org.apache.commons.io.IOUtils;
 import org.eclipse.microprofile.openapi.models.OpenAPI;
 import org.json.JSONException;
 import org.junit.jupiter.api.Test;
@@ -19,16 +20,6 @@
  */
 class MergeUtilTest {
 
-    /**
-     * Loads a resource as a string (reads the content at the URL).
-     *
-     * @param testResource
-     * @throws IOException
-     */
-    private static String loadResource(URL testResource) throws IOException {
-        return IOUtils.toString(testResource, "UTF-8");
-    }
-
     /**
      * Compares two JSON strings.
      *
diff --git a/core/src/test/java/io/smallrye/openapi/runtime/io/OpenApiParserAndSerializerTest.java b/core/src/test/java/io/smallrye/openapi/runtime/io/OpenApiParserAndSerializerTest.java
index 91e394536..da5741f30 100644
--- a/core/src/test/java/io/smallrye/openapi/runtime/io/OpenApiParserAndSerializerTest.java
+++ b/core/src/test/java/io/smallrye/openapi/runtime/io/OpenApiParserAndSerializerTest.java
@@ -1,5 +1,6 @@
 package io.smallrye.openapi.runtime.io;
 
+import static io.smallrye.openapi.runtime.scanner.IndexScannerTestBase.loadResource;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
@@ -13,7 +14,6 @@
 import java.nio.file.Files;
 import java.nio.file.Path;
 
-import org.apache.commons.io.IOUtils;
 import org.eclipse.microprofile.openapi.OASFactory;
 import org.eclipse.microprofile.openapi.models.OpenAPI;
 import org.json.JSONException;
@@ -36,16 +36,6 @@ class OpenApiParserAndSerializerTest {
 
     static final int REPEAT_BODY_CONTENTS_ITERATIONS = 1536; // ~8MB?
 
-    /**
-     * Loads a resource as a string (reads the content at the URL).
-     *
-     * @param testResource
-     * @throws IOException
-     */
-    private static String loadResource(URL testResource) throws IOException {
-        return IOUtils.toString(testResource, "UTF-8");
-    }
-
     /**
      * Compares two JSON strings.
      *
diff --git a/core/src/test/java/io/smallrye/openapi/runtime/scanner/IndexScannerTestBase.java b/core/src/test/java/io/smallrye/openapi/runtime/scanner/IndexScannerTestBase.java
index a7a98888b..028567cda 100644
--- a/core/src/test/java/io/smallrye/openapi/runtime/scanner/IndexScannerTestBase.java
+++ b/core/src/test/java/io/smallrye/openapi/runtime/scanner/IndexScannerTestBase.java
@@ -6,8 +6,10 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
+import java.io.Reader;
 import java.io.UncheckedIOException;
 import java.net.URL;
+import java.nio.charset.StandardCharsets;
 import java.nio.file.Paths;
 import java.util.Collections;
 import java.util.HashMap;
@@ -15,7 +17,6 @@
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
-import org.apache.commons.io.IOUtils;
 import org.eclipse.microprofile.config.Config;
 import org.eclipse.microprofile.config.spi.ConfigSource;
 import org.eclipse.microprofile.openapi.models.OpenAPI;
@@ -181,19 +182,23 @@ public static void assertJsonEquals(String expectedResource, Class<?>... classes
     }
 
     public static String loadResource(URL testResource) throws IOException {
-        return IOUtils.toString(testResource, "UTF-8");
+        final char[] buffer = new char[8192];
+        final StringBuilder result = new StringBuilder();
+
+        try (Reader reader = new InputStreamReader(testResource.openStream(), StandardCharsets.UTF_8)) {
+            int count;
+            while ((count = reader.read(buffer, 0, buffer.length)) > 0) {
+                result.append(buffer, 0, count);
+            }
+        }
+
+        return result.toString();
     }
 
     public static OpenApiConfig emptyConfig() {
         return dynamicConfig(Collections.emptyMap());
     }
 
-    //    public static OpenApiConfig nestingSupportConfig() {
-    //        Map<String, Object> config = new HashMap<>();
-    //        config.put(OpenApiConstants.SMALLRYE_SCHEMA_REFERENCES_ENABLE, Boolean.TRUE);
-    //        return dynamicConfig(config);
-    //    }
-
     public static OpenApiConfig dynamicConfig(String key, Object value) {
         Map<String, String> config = new HashMap<>(1);
         config.put(key, value.toString());
diff --git a/extension-spring/pom.xml b/extension-spring/pom.xml
index 842e6d4fd..d6e7a85df 100644
--- a/extension-spring/pom.xml
+++ b/extension-spring/pom.xml
@@ -58,12 +58,6 @@
             <artifactId>jsonassert</artifactId>
             <scope>test</scope>
         </dependency>
-        <dependency>
-            <groupId>commons-io</groupId>
-            <artifactId>commons-io</artifactId>
-            <version>2.14.0</version>
-            <scope>test</scope>
-        </dependency>
         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-webmvc</artifactId>
diff --git a/extension-vertx/pom.xml b/extension-vertx/pom.xml
index 93799eeb2..860f03136 100644
--- a/extension-vertx/pom.xml
+++ b/extension-vertx/pom.xml
@@ -50,13 +50,6 @@
             <artifactId>jsonassert</artifactId>
             <scope>test</scope>
         </dependency>
-        <dependency>
-            <groupId>commons-io</groupId>
-            <artifactId>commons-io</artifactId>
-            <version>2.14.0</version>
-            <scope>test</scope>
-        </dependency>
-
 
         <!-- Depend on core tests -->
         <dependency>