diff --git a/README.md b/README.md
index ddd2aa84a..62d7d95ae 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 JFreeChart
 ==========
 
-Version 1.5.5, not yet released.
+Version 1.5.5, 23 June 2024.
 
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/org.jfree/jfreechart/badge.svg)](https://maven-badges.herokuapp.com/maven-central/org.jfree/jfreechart)
 
@@ -33,7 +33,7 @@ To use JFreeChart in your projects, add the following dependency to your build t
     <dependency>
         <groupId>org.jfree</groupId>
         <artifactId>jfreechart</artifactId>
-        <version>1.5.4</version>
+        <version>1.5.5</version>
     </dependency>
 
 
@@ -56,11 +56,23 @@ at GitHub:
 
 History
 -------
-##### Version 1.5.5 (not yet released)
+##### Version 1.5.5 (23 June 2024)
 - added `XYBezierRenderer` by Javier Robes ([#286](https://github.com/jfree/jfreechart/pull/286))
 - fix cross-hair painting ([#340](https://github.com/jfree/jfreechart/issues/340))
 - parameter range check for `CompassPlot` ([#397](https://github.com/jfree/jfreechart/pull/397))
 
+Note: some security vulnerabilities have been reported for v1.5.4. :
+
+- [CVE-2023-52070](https://nvd.nist.gov/vuln/detail/CVE-2023-52070) : an `ArrayIndexOutOfBoundsException` in `CompassPlot`\
+  No fix is considered necessary, however ([#397](https://github.com/jfree/jfreechart/pull/397)) has been applied.
+
+- [CVE-2024-22949](https://nvd.nist.gov/vuln/detail/CVE-2024-22949) : a possible `NullPointerException` in `CategoryLineAnnotation`\
+  No fix is considered necessary.
+
+- [CVE-2024-23076](https://nvd.nist.gov/vuln/detail/CVE-2024-23076) : a possible `NullPointerException` in `BubbleXYItemLabelGenerator`\
+  No fix is considered necessary.
+
+
 ##### Version 1.5.4 (8 January 2023)
 - add new methods to access maps for datasets, renderers and axes in plots ([#201](https://github.com/jfree/jfreechart/issues/201));
 - add option to truncate item labels and compute contrast colors (PR [#225](https://github.com/jfree/jfreechart/pull/225))
@@ -72,7 +84,6 @@ History
 - add argument checks for annotations ([#223](https://github.com/jfree/jfreechart/issues/223));
 - removed `JFreeChartResources.java` file ([#239](https://github.com/jfree/jfreechart/issues/239))
 
-
 ##### Version 1.5.3 (21 February 2021)
 - add new `FlowPlot` class for drawing Sankey charts;
 - throw exception in `DefaultPieDataset` for invalid index ([#212](https://github.com/jfree/jfreechart/issues/212));
diff --git a/pom.xml b/pom.xml
index 0b7f54481..30c718ced 100644
--- a/pom.xml
+++ b/pom.xml
@@ -10,7 +10,7 @@
 
     <artifactId>jfreechart</artifactId>
     <groupId>org.jfree</groupId>
-    <version>1.5.5-snapshot</version>
+    <version>1.5.5</version>
     <packaging>jar</packaging>
 
     <organization>
@@ -204,7 +204,7 @@
                     <plugin>
                         <groupId>org.apache.maven.plugins</groupId>
                         <artifactId>maven-gpg-plugin</artifactId>
-                        <version>1.5</version>
+                        <version>3.2.4</version>
                         <executions>
                             <execution>
                                 <id>sign-artifacts</id>
@@ -219,7 +219,7 @@
                     <plugin>
                         <groupId>org.sonatype.plugins</groupId>
                         <artifactId>nexus-staging-maven-plugin</artifactId>
-                        <version>1.6.13</version>
+                        <version>1.7.0</version>
                         <extensions>true</extensions>
                         <configuration>
                             <serverId>ossrh</serverId>
@@ -231,7 +231,7 @@
                     <plugin>
                         <groupId>org.apache.maven.plugins</groupId>
                         <artifactId>maven-javadoc-plugin</artifactId>
-                        <version>3.4.1</version>
+                        <version>3.7.0</version>
                         <configuration>
                             <linksource>true</linksource>
                             <source>8</source>
@@ -250,7 +250,7 @@
                     <plugin>
                         <groupId>org.apache.maven.plugins</groupId>
                         <artifactId>maven-source-plugin</artifactId>
-                        <version>3.2.1</version>
+                        <version>3.3.1</version>
                         <executions>
                             <execution>
                                 <id>attach-sources</id>
diff --git a/src/main/java/org/jfree/chart/annotations/CategoryLineAnnotation.java b/src/main/java/org/jfree/chart/annotations/CategoryLineAnnotation.java
index 3063821fe..347d26138 100644
--- a/src/main/java/org/jfree/chart/annotations/CategoryLineAnnotation.java
+++ b/src/main/java/org/jfree/chart/annotations/CategoryLineAnnotation.java
@@ -274,11 +274,11 @@ public void setStroke(Stroke stroke) {
     /**
      * Draws the annotation.
      *
-     * @param g2  the graphics device.
-     * @param plot  the plot.
-     * @param dataArea  the data area.
-     * @param domainAxis  the domain axis.
-     * @param rangeAxis  the range axis.
+     * @param g2  the graphics device ({@code null} not permitted).
+     * @param plot  the plot ({@code null} not permitted).
+     * @param dataArea  the data area ({@code null} not permitted).
+     * @param domainAxis  the domain axis ({@code null} not permitted).
+     * @param rangeAxis  the range axis ({@code null} not permitted).
      */
     @Override
     public void draw(Graphics2D g2, CategoryPlot plot, Rectangle2D dataArea,