diff --git a/CHANGELOG.md b/CHANGELOG.md
index b973b700..39907134 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,21 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 This project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html),
 with the exception that 0.x versions can break between minor versions.
 
+## [0.28.0] - 2026-03-31
+### Added
+- New extension for alerts (aka callouts/admonitions)
+  - Syntax:
+    ```
+    > [!NOTE]
+    > The text of the note.
+    ```
+  - As types you can use NOTE, TIP, IMPORTANT, WARNING, CAUTION; or configure the
+    extension to add additional ones.
+  - Use class `AlertsExtension` in artifact `commonmark-ext-gfm-alerts` (#420)
+- New option `maxOpenBlockParsers` for `Parser.Builder` to set an overall limit
+  for the depth of block parsing. If set, any nesting beyond the limit will be
+  parsed as paragraph text instead. The default remains unlimited.
+
 ## [0.27.1] - 2026-01-14
 ### Fixed
 - Line(s) after a hard line break would sometimes also get an unwanted hard
@@ -518,6 +533,7 @@ API breaking changes (caused by changes in spec):
 Initial release of commonmark-java, a port of commonmark.js with extensions
 for autolinking URLs, GitHub flavored strikethrough and tables.
 
+[0.28.0]: https://github.com/commonmark/commonmark-java/compare/commonmark-parent-0.27.1...commonmark-parent-0.28.0
 [0.27.1]: https://github.com/commonmark/commonmark-java/compare/commonmark-parent-0.27.0...commonmark-parent-0.27.1
 [0.27.0]: https://github.com/commonmark/commonmark-java/compare/commonmark-parent-0.26.0...commonmark-parent-0.27.0
 [0.26.0]: https://github.com/commonmark/commonmark-java/compare/commonmark-parent-0.25.1...commonmark-parent-0.26.0
diff --git a/commonmark-ext-autolink/pom.xml b/commonmark-ext-autolink/pom.xml
index a99fd0b8..79d8db07 100644
--- a/commonmark-ext-autolink/pom.xml
+++ b/commonmark-ext-autolink/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.commonmark</groupId>
         <artifactId>commonmark-parent</artifactId>
-        <version>0.27.2-SNAPSHOT</version>
+        <version>0.28.0-SNAPSHOT</version>
     </parent>
 
     <artifactId>commonmark-ext-autolink</artifactId>
diff --git a/commonmark-ext-footnotes/pom.xml b/commonmark-ext-footnotes/pom.xml
index 8bb88d74..14a4a929 100644
--- a/commonmark-ext-footnotes/pom.xml
+++ b/commonmark-ext-footnotes/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.commonmark</groupId>
         <artifactId>commonmark-parent</artifactId>
-        <version>0.27.2-SNAPSHOT</version>
+        <version>0.28.0-SNAPSHOT</version>
     </parent>
 
     <artifactId>commonmark-ext-footnotes</artifactId>
diff --git a/commonmark-ext-gfm-alerts/pom.xml b/commonmark-ext-gfm-alerts/pom.xml
index 5235af6b..7780e4e2 100644
--- a/commonmark-ext-gfm-alerts/pom.xml
+++ b/commonmark-ext-gfm-alerts/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.commonmark</groupId>
         <artifactId>commonmark-parent</artifactId>
-        <version>0.27.2-SNAPSHOT</version>
+        <version>0.28.0-SNAPSHOT</version>
     </parent>
 
     <artifactId>commonmark-ext-gfm-alerts</artifactId>
diff --git a/commonmark-ext-gfm-strikethrough/pom.xml b/commonmark-ext-gfm-strikethrough/pom.xml
index f6cedc69..8c9a6b29 100644
--- a/commonmark-ext-gfm-strikethrough/pom.xml
+++ b/commonmark-ext-gfm-strikethrough/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.commonmark</groupId>
         <artifactId>commonmark-parent</artifactId>
-        <version>0.27.2-SNAPSHOT</version>
+        <version>0.28.0-SNAPSHOT</version>
     </parent>
 
     <artifactId>commonmark-ext-gfm-strikethrough</artifactId>
diff --git a/commonmark-ext-gfm-tables/pom.xml b/commonmark-ext-gfm-tables/pom.xml
index 4e94f623..37ead1ce 100644
--- a/commonmark-ext-gfm-tables/pom.xml
+++ b/commonmark-ext-gfm-tables/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.commonmark</groupId>
         <artifactId>commonmark-parent</artifactId>
-        <version>0.27.2-SNAPSHOT</version>
+        <version>0.28.0-SNAPSHOT</version>
     </parent>
 
     <artifactId>commonmark-ext-gfm-tables</artifactId>
diff --git a/commonmark-ext-heading-anchor/pom.xml b/commonmark-ext-heading-anchor/pom.xml
index 707948a1..c2be557e 100644
--- a/commonmark-ext-heading-anchor/pom.xml
+++ b/commonmark-ext-heading-anchor/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.commonmark</groupId>
         <artifactId>commonmark-parent</artifactId>
-        <version>0.27.2-SNAPSHOT</version>
+        <version>0.28.0-SNAPSHOT</version>
     </parent>
 
     <artifactId>commonmark-ext-heading-anchor</artifactId>
diff --git a/commonmark-ext-image-attributes/pom.xml b/commonmark-ext-image-attributes/pom.xml
index 456ac04a..19ea007a 100644
--- a/commonmark-ext-image-attributes/pom.xml
+++ b/commonmark-ext-image-attributes/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.commonmark</groupId>
         <artifactId>commonmark-parent</artifactId>
-        <version>0.27.2-SNAPSHOT</version>
+        <version>0.28.0-SNAPSHOT</version>
     </parent>
 
     <artifactId>commonmark-ext-image-attributes</artifactId>
diff --git a/commonmark-ext-ins/pom.xml b/commonmark-ext-ins/pom.xml
index a06c27b2..7288b397 100644
--- a/commonmark-ext-ins/pom.xml
+++ b/commonmark-ext-ins/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.commonmark</groupId>
         <artifactId>commonmark-parent</artifactId>
-        <version>0.27.2-SNAPSHOT</version>
+        <version>0.28.0-SNAPSHOT</version>
     </parent>
 
     <artifactId>commonmark-ext-ins</artifactId>
diff --git a/commonmark-ext-task-list-items/pom.xml b/commonmark-ext-task-list-items/pom.xml
index 0fc16467..bdd592d7 100644
--- a/commonmark-ext-task-list-items/pom.xml
+++ b/commonmark-ext-task-list-items/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.commonmark</groupId>
         <artifactId>commonmark-parent</artifactId>
-        <version>0.27.2-SNAPSHOT</version>
+        <version>0.28.0-SNAPSHOT</version>
     </parent>
 
     <artifactId>commonmark-ext-task-list-items</artifactId>
diff --git a/commonmark-ext-yaml-front-matter/pom.xml b/commonmark-ext-yaml-front-matter/pom.xml
index 860cfbac..85b3ad21 100644
--- a/commonmark-ext-yaml-front-matter/pom.xml
+++ b/commonmark-ext-yaml-front-matter/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <artifactId>commonmark-parent</artifactId>
         <groupId>org.commonmark</groupId>
-        <version>0.27.2-SNAPSHOT</version>
+        <version>0.28.0-SNAPSHOT</version>
     </parent>
 
     <artifactId>commonmark-ext-yaml-front-matter</artifactId>
diff --git a/commonmark-integration-test/pom.xml b/commonmark-integration-test/pom.xml
index 8e52dd38..6b1d76a6 100644
--- a/commonmark-integration-test/pom.xml
+++ b/commonmark-integration-test/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.commonmark</groupId>
         <artifactId>commonmark-parent</artifactId>
-        <version>0.27.2-SNAPSHOT</version>
+        <version>0.28.0-SNAPSHOT</version>
     </parent>
 
     <artifactId>commonmark-integration-test</artifactId>
diff --git a/commonmark-test-util/pom.xml b/commonmark-test-util/pom.xml
index 699adb3d..063b8af4 100644
--- a/commonmark-test-util/pom.xml
+++ b/commonmark-test-util/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.commonmark</groupId>
         <artifactId>commonmark-parent</artifactId>
-        <version>0.27.2-SNAPSHOT</version>
+        <version>0.28.0-SNAPSHOT</version>
     </parent>
 
     <artifactId>commonmark-test-util</artifactId>
diff --git a/commonmark/pom.xml b/commonmark/pom.xml
index 76dad6c8..650a5562 100644
--- a/commonmark/pom.xml
+++ b/commonmark/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.commonmark</groupId>
         <artifactId>commonmark-parent</artifactId>
-        <version>0.27.2-SNAPSHOT</version>
+        <version>0.28.0-SNAPSHOT</version>
     </parent>
 
     <artifactId>commonmark</artifactId>
diff --git a/pom.xml b/pom.xml
index 1c9a53f2..ace89ff3 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,7 +5,7 @@
 
     <groupId>org.commonmark</groupId>
     <artifactId>commonmark-parent</artifactId>
-    <version>0.27.2-SNAPSHOT</version>
+    <version>0.28.0-SNAPSHOT</version>
     <name>commonmark-java parent</name>
     <description>
         Java implementation of CommonMark, a specification of the Markdown format for turning plain text into formatted
@@ -133,62 +133,62 @@
             <dependency>
                 <groupId>org.commonmark</groupId>
                 <artifactId>commonmark</artifactId>
-                <version>0.27.2-SNAPSHOT</version>
+                <version>0.28.0-SNAPSHOT</version>
             </dependency>
             <dependency>
                 <groupId>org.commonmark</groupId>
                 <artifactId>commonmark-ext-autolink</artifactId>
-                <version>0.27.2-SNAPSHOT</version>
+                <version>0.28.0-SNAPSHOT</version>
             </dependency>
             <dependency>
                 <groupId>org.commonmark</groupId>
                 <artifactId>commonmark-ext-footnotes</artifactId>
-                <version>0.27.2-SNAPSHOT</version>
+                <version>0.28.0-SNAPSHOT</version>
             </dependency>
             <dependency>
                 <groupId>org.commonmark</groupId>
                 <artifactId>commonmark-ext-image-attributes</artifactId>
-                <version>0.27.2-SNAPSHOT</version>
+                <version>0.28.0-SNAPSHOT</version>
             </dependency>
             <dependency>
                 <groupId>org.commonmark</groupId>
                 <artifactId>commonmark-ext-ins</artifactId>
-                <version>0.27.2-SNAPSHOT</version>
+                <version>0.28.0-SNAPSHOT</version>
             </dependency>
             <dependency>
                 <groupId>org.commonmark</groupId>
                 <artifactId>commonmark-ext-gfm-alerts</artifactId>
-                <version>0.27.2-SNAPSHOT</version>
+                <version>0.28.0-SNAPSHOT</version>
             </dependency>
             <dependency>
                 <groupId>org.commonmark</groupId>
                 <artifactId>commonmark-ext-gfm-strikethrough</artifactId>
-                <version>0.27.2-SNAPSHOT</version>
+                <version>0.28.0-SNAPSHOT</version>
             </dependency>
             <dependency>
                 <groupId>org.commonmark</groupId>
                 <artifactId>commonmark-ext-gfm-tables</artifactId>
-                <version>0.27.2-SNAPSHOT</version>
+                <version>0.28.0-SNAPSHOT</version>
             </dependency>
             <dependency>
                 <groupId>org.commonmark</groupId>
                 <artifactId>commonmark-ext-heading-anchor</artifactId>
-                <version>0.27.2-SNAPSHOT</version>
+                <version>0.28.0-SNAPSHOT</version>
             </dependency>
             <dependency>
                 <groupId>org.commonmark</groupId>
                 <artifactId>commonmark-ext-task-list-items</artifactId>
-                <version>0.27.2-SNAPSHOT</version>
+                <version>0.28.0-SNAPSHOT</version>
             </dependency>
             <dependency>
                 <groupId>org.commonmark</groupId>
                 <artifactId>commonmark-ext-yaml-front-matter</artifactId>
-                <version>0.27.2-SNAPSHOT</version>
+                <version>0.28.0-SNAPSHOT</version>
             </dependency>
             <dependency>
                 <groupId>org.commonmark</groupId>
                 <artifactId>commonmark-test-util</artifactId>
-                <version>0.27.2-SNAPSHOT</version>
+                <version>0.28.0-SNAPSHOT</version>
             </dependency>
 
             <!-- Common test dependencies -->