diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0a3717642..d7321c688 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,7 @@
 
 Note: version releases in the 0.x.y range may introduce breaking changes.
 
-## [unreleased]
+## [2.9.1]
  ### Added 
  ### Fixed 
 
@@ -390,4 +390,4 @@ Note: version releases in the 0.x.y range may introduce breaking changes.
 [2.7.0]: https://github.com/ehrbase/openEHR_SDK/compare/v2.6.0...v2.7.0
 [2.8.0]: https://github.com/ehrbase/openEHR_SDK/compare/v2.7.0...v2.8.0
 [2.9.0]: https://github.com/ehrbase/openEHR_SDK/compare/v2.8.0...v2.9.0
-[unreleased]: https://github.com/ehrbase/openEHR_SDK/compare/v2.9.0...HEAD
+[2.9.1]: https://github.com/ehrbase/openEHR_SDK/compare/v2.9.0...v2.9.1
diff --git a/aql/pom.xml b/aql/pom.xml
index 997f3b610..59b9d235f 100644
--- a/aql/pom.xml
+++ b/aql/pom.xml
@@ -25,7 +25,7 @@
     <parent>
         <groupId>org.ehrbase.openehr.sdk</groupId>
         <artifactId>sdk-parent</artifactId>
-        <version>2.10.0-SNAPSHOT</version>
+        <version>2.9.1</version>
     </parent>
 
     <artifactId>aql</artifactId>
diff --git a/bom/pom.xml b/bom/pom.xml
index 7680ac9cb..a7de05fe3 100644
--- a/bom/pom.xml
+++ b/bom/pom.xml
@@ -8,7 +8,7 @@
 
     <artifactId>bom</artifactId>
     <groupId>org.ehrbase.openehr.sdk</groupId>
-    <version>2.10.0-SNAPSHOT</version>
+    <version>2.9.1</version>
     <packaging>pom</packaging>
 
     <name>openEHR SDK</name>
diff --git a/client/pom.xml b/client/pom.xml
index 232040078..695a856cb 100644
--- a/client/pom.xml
+++ b/client/pom.xml
@@ -26,7 +26,7 @@
     <parent>
         <groupId>org.ehrbase.openehr.sdk</groupId>
         <artifactId>sdk-parent</artifactId>
-        <version>2.10.0-SNAPSHOT</version>
+        <version>2.9.1</version>
     </parent>
 
     <artifactId>client</artifactId>
diff --git a/example-generator/pom.xml b/example-generator/pom.xml
index dac0a6b1a..87a4ff2ee 100644
--- a/example-generator/pom.xml
+++ b/example-generator/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <artifactId>sdk-parent</artifactId>
         <groupId>org.ehrbase.openehr.sdk</groupId>
-        <version>2.10.0-SNAPSHOT</version>
+        <version>2.9.1</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/generator-commons/pom.xml b/generator-commons/pom.xml
index cb407b842..18a0b1cb3 100644
--- a/generator-commons/pom.xml
+++ b/generator-commons/pom.xml
@@ -6,7 +6,7 @@
     <parent>
         <groupId>org.ehrbase.openehr.sdk</groupId>
         <artifactId>sdk-parent</artifactId>
-        <version>2.10.0-SNAPSHOT</version>
+        <version>2.9.1</version>
     </parent>
 
     <artifactId>generator-commons</artifactId>
diff --git a/generator-maven-plugin/pom.xml b/generator-maven-plugin/pom.xml
index 5faecd42f..fff579f5e 100644
--- a/generator-maven-plugin/pom.xml
+++ b/generator-maven-plugin/pom.xml
@@ -5,7 +5,7 @@
   <parent>
     <artifactId>sdk-parent</artifactId>
     <groupId>org.ehrbase.openehr.sdk</groupId>
-    <version>2.10.0-SNAPSHOT</version>
+    <version>2.9.1</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
 
diff --git a/generator/pom.xml b/generator/pom.xml
index 16e2fe00b..433d35e9a 100644
--- a/generator/pom.xml
+++ b/generator/pom.xml
@@ -25,7 +25,7 @@
     <parent>
         <groupId>org.ehrbase.openehr.sdk</groupId>
         <artifactId>sdk-parent</artifactId>
-        <version>2.10.0-SNAPSHOT</version>
+        <version>2.9.1</version>
     </parent>
 
     <artifactId>generator</artifactId>
diff --git a/opt-1.4/pom.xml b/opt-1.4/pom.xml
index 20cae60cf..9fbef9c6c 100644
--- a/opt-1.4/pom.xml
+++ b/opt-1.4/pom.xml
@@ -26,7 +26,7 @@
     <parent>
         <groupId>org.ehrbase.openehr.sdk</groupId>
         <artifactId>sdk-parent</artifactId>
-        <version>2.10.0-SNAPSHOT</version>
+        <version>2.9.1</version>
     </parent>
 
     <artifactId>opt-1.4</artifactId>
diff --git a/pom.xml b/pom.xml
index 7f3c93da6..5129fdfd1 100644
--- a/pom.xml
+++ b/pom.xml
@@ -25,13 +25,13 @@
     <parent>
         <groupId>org.ehrbase.openehr.sdk</groupId>
         <artifactId>bom</artifactId>
-        <version>2.10.0-SNAPSHOT</version>
+        <version>2.9.1</version>
         <relativePath>./bom/pom.xml</relativePath>
     </parent>
 
     <groupId>org.ehrbase.openehr.sdk</groupId>
     <artifactId>sdk-parent</artifactId>
-    <version>2.10.0-SNAPSHOT</version>
+    <version>2.9.1</version>
     <packaging>pom</packaging>
     <name>openEHR SDK</name>
 
diff --git a/response-dto/pom.xml b/response-dto/pom.xml
index c67aa2bf4..ddae35b07 100644
--- a/response-dto/pom.xml
+++ b/response-dto/pom.xml
@@ -26,7 +26,7 @@
   <parent>
     <groupId>org.ehrbase.openehr.sdk</groupId>
     <artifactId>sdk-parent</artifactId>
-    <version>2.10.0-SNAPSHOT</version>
+    <version>2.9.1</version>
   </parent>
 
   <artifactId>response-dto</artifactId>
diff --git a/serialisation/pom.xml b/serialisation/pom.xml
index 3a2be3a79..6de07c768 100644
--- a/serialisation/pom.xml
+++ b/serialisation/pom.xml
@@ -26,7 +26,7 @@
     <parent>
         <groupId>org.ehrbase.openehr.sdk</groupId>
         <artifactId>sdk-parent</artifactId>
-        <version>2.10.0-SNAPSHOT</version>
+        <version>2.9.1</version>
     </parent>
 
     <artifactId>serialisation</artifactId>
diff --git a/serialisation_conformance_test/pom.xml b/serialisation_conformance_test/pom.xml
index 82ba4b509..282598721 100644
--- a/serialisation_conformance_test/pom.xml
+++ b/serialisation_conformance_test/pom.xml
@@ -26,7 +26,7 @@
     <parent>
         <groupId>org.ehrbase.openehr.sdk</groupId>
         <artifactId>sdk-parent</artifactId>
-        <version>2.10.0-SNAPSHOT</version>
+        <version>2.9.1</version>
     </parent>
 
     <artifactId>serialisation_conformance_test</artifactId>
diff --git a/terminology/pom.xml b/terminology/pom.xml
index 4b1cb64d9..06b3f6c7d 100644
--- a/terminology/pom.xml
+++ b/terminology/pom.xml
@@ -26,7 +26,7 @@
     <parent>
         <groupId>org.ehrbase.openehr.sdk</groupId>
         <artifactId>sdk-parent</artifactId>
-        <version>2.10.0-SNAPSHOT</version>
+        <version>2.9.1</version>
     </parent>
 
     <artifactId>terminology</artifactId>
diff --git a/test-coverage/pom.xml b/test-coverage/pom.xml
index d4ae94aa4..711b91566 100644
--- a/test-coverage/pom.xml
+++ b/test-coverage/pom.xml
@@ -8,7 +8,7 @@
     <parent>
         <groupId>org.ehrbase.openehr.sdk</groupId>
         <artifactId>sdk-parent</artifactId>
-        <version>2.10.0-SNAPSHOT</version>
+        <version>2.9.1</version>
     </parent>
 
     <artifactId>test-coverage</artifactId>
diff --git a/test-data/pom.xml b/test-data/pom.xml
index 5e7a36881..52fec2ff8 100644
--- a/test-data/pom.xml
+++ b/test-data/pom.xml
@@ -26,7 +26,7 @@
     <parent>
         <groupId>org.ehrbase.openehr.sdk</groupId>
         <artifactId>sdk-parent</artifactId>
-        <version>2.10.0-SNAPSHOT</version>
+        <version>2.9.1</version>
     </parent>
 
     <artifactId>test-data</artifactId>
diff --git a/util/pom.xml b/util/pom.xml
index 9ac147909..3b6d9997b 100644
--- a/util/pom.xml
+++ b/util/pom.xml
@@ -25,7 +25,7 @@
     <parent>
         <groupId>org.ehrbase.openehr.sdk</groupId>
         <artifactId>sdk-parent</artifactId>
-        <version>2.10.0-SNAPSHOT</version>
+        <version>2.9.1</version>
     </parent>
 
     <artifactId>util</artifactId>
diff --git a/validation/pom.xml b/validation/pom.xml
index 18e3224d9..4b9fd3eb8 100644
--- a/validation/pom.xml
+++ b/validation/pom.xml
@@ -24,7 +24,7 @@
     <parent>
         <groupId>org.ehrbase.openehr.sdk</groupId>
         <artifactId>sdk-parent</artifactId>
-        <version>2.10.0-SNAPSHOT</version>
+        <version>2.9.1</version>
     </parent>
 
     <artifactId>validation</artifactId>
diff --git a/web-template/pom.xml b/web-template/pom.xml
index 682d63c10..13d7bd06d 100644
--- a/web-template/pom.xml
+++ b/web-template/pom.xml
@@ -25,7 +25,7 @@
     <parent>
         <groupId>org.ehrbase.openehr.sdk</groupId>
         <artifactId>sdk-parent</artifactId>
-        <version>2.10.0-SNAPSHOT</version>
+        <version>2.9.1</version>
     </parent>
 
     <artifactId>web-template</artifactId>