diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0031dea9..7c615fe6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,5 @@
 
+### March 8, 2021 version 1.5.5
  * Ensure `System.gc()` never gets called with "org.bytedeco.javacpp.nopointergc" ([issue tensorflow/java#208](https://github.com/tensorflow/java/issues/208))
  * Add `Info.immutable` to disable generating setters for public data members ([pull #461](https://github.com/bytedeco/javacpp/pull/461))
  * Map `String` to `char*` with `Charset.forName(STRING_BYTES_CHARSET)` when that macro is defined ([pull #460](https://github.com/bytedeco/javacpp/pull/460))
diff --git a/README.md b/README.md
index 9e6f9b02..658cb1c1 100644
--- a/README.md
+++ b/README.md
@@ -26,27 +26,27 @@ We can also have everything downloaded and installed automatically with:
   <dependency>
     <groupId>org.bytedeco</groupId>
     <artifactId>javacpp</artifactId>
-    <version>1.5.4</version>
+    <version>1.5.5</version>
   </dependency>
 ```
 
  * Gradle (inside the `build.gradle` file)
 ```groovy
   dependencies {
-    implementation group: 'org.bytedeco', name: 'javacpp', version: '1.5.4'
+    implementation group: 'org.bytedeco', name: 'javacpp', version: '1.5.5'
   }
 ```
 
  * Leiningen (inside the `project.clj` file)
 ```clojure
   :dependencies [
-    [org.bytedeco/javacpp "1.5.4"]
+    [org.bytedeco/javacpp "1.5.5"]
   ]
 ```
 
  * sbt (inside the `build.sbt` file)
 ```scala
-  libraryDependencies += "org.bytedeco" % "javacpp" % "1.5.4"
+  libraryDependencies += "org.bytedeco" % "javacpp" % "1.5.5"
 ```
 
 Another option available to Gradle users is [Gradle JavaCPP](https://github.com/bytedeco/gradle-javacpp), and similarly for Scala users there is [SBT-JavaCPP](https://github.com/bytedeco/sbt-javacpp).
diff --git a/platform/pom.xml b/platform/pom.xml
index 4b40e996..9d7fe568 100644
--- a/platform/pom.xml
+++ b/platform/pom.xml
@@ -4,7 +4,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.bytedeco</groupId>
   <artifactId>javacpp-platform</artifactId>
-  <version>1.5.5-SNAPSHOT</version>
+  <version>1.5.5</version>
 
   <name>JavaCPP Platform</name>
   <description>The missing bridge between Java and native C++</description>
diff --git a/pom.xml b/pom.xml
index d3050e0f..3aa1d857 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.bytedeco</groupId>
   <artifactId>javacpp</artifactId>
-  <version>1.5.5-SNAPSHOT</version>
+  <version>1.5.5</version>
 
   <name>JavaCPP</name>
   <description>The missing bridge between Java and native C++</description>
diff --git a/src/main/java/org/bytedeco/javacpp/ClassProperties.java b/src/main/java/org/bytedeco/javacpp/ClassProperties.java
index 552db195..96f614e7 100644
--- a/src/main/java/org/bytedeco/javacpp/ClassProperties.java
+++ b/src/main/java/org/bytedeco/javacpp/ClassProperties.java
@@ -111,11 +111,9 @@ public void addAll(String key, Collection<String> values) {
                         new File(root + value).exists()) {
                     value = root + value;
                 }
-                if (values2.contains(value)) {
-                    // remove existing values to allow overriding them
-                    values2.remove(value);
+                if (!values2.contains(value)) {
+                    values2.add(value);
                 }
-                values2.add(value);
             }
         }
     }
diff --git a/src/main/java/org/bytedeco/javacpp/tools/Generator.java b/src/main/java/org/bytedeco/javacpp/tools/Generator.java
index c6708234..6bfa6528 100644
--- a/src/main/java/org/bytedeco/javacpp/tools/Generator.java
+++ b/src/main/java/org/bytedeco/javacpp/tools/Generator.java
@@ -2364,6 +2364,12 @@ String returnBefore(MethodInformation methodInfo) {
                         }
                     }
                 } else if (methodInfo.returnType == String.class) {
+                    if (returnBy instanceof ByPtrPtr) {
+                        typeName[0] = valueTypeName;
+                    }
+                    if (!typeName[0].startsWith("const ")) {
+                        typeName[0] = "const " + typeName[0];
+                    }
                     out.println("    jstring rarg = NULL;");
                     out.println("    " + typeName[0] + " rptr;");
                     if (returnBy instanceof ByRef) {
@@ -3179,6 +3185,12 @@ void callback(Class<?> cls, Method callbackMethod, String callbackName, int allo
                         out.println("    args[" + j + "].l = obj" + j + ";");
                     } else if (callbackParameterTypes[j] == String.class) {
                         passesStrings = true;
+                        if (passBy instanceof ByPtrPtr) {
+                            typeName[0] = valueTypeName;
+                        }
+                        if (!typeName[0].startsWith("const ")) {
+                            typeName[0] = "const " + typeName[0];
+                        }
                         if (adapterInfo != null) {
                             final String adapter = "adapter" + j;
                             out.println("    jstring obj" + j + " = " + createString("(" + typeName[0] + ") " + adapter, adapter, callbackParameterAnnotations[j]));