diff --git a/Mustang-CLI/pom.xml b/Mustang-CLI/pom.xml
index 3a2ae520..2922415d 100644
--- a/Mustang-CLI/pom.xml
+++ b/Mustang-CLI/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <groupId>org.mustangproject</groupId>
         <artifactId>core</artifactId>
-        <version>2.18.1-SNAPSHOT</version>
+        <version>2.17.1-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <groupId>org.mustangproject</groupId>
@@ -12,7 +12,7 @@
         should also work for XRechnung/CII.
     </name>
     <packaging>jar</packaging>
-    <version>2.18.1-SNAPSHOT</version>
+    <version>2.17.1-SNAPSHOT</version>
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <maven.compiler.compilerVersion>11</maven.compiler.compilerVersion>
@@ -23,7 +23,7 @@
         <dependency>
             <groupId>org.mustangproject</groupId>
             <artifactId>validator</artifactId>
-            <version>2.18.1-SNAPSHOT</version>
+            <version>2.17.1-SNAPSHOT</version>
             <!-- prototypes of new mustangproject versions can be installed by referring to them and installed to the local repo from a jar file with
            mvn install:install-file -Dfile=mustang-1.5.4-SNAPSHOT.jar -DgroupId=org.mustangproject.ZUGFeRD -DartifactId=mustang -Dversion=1.5.4 -Dpackaging=jar -DgeneratePom=true
            -->
diff --git a/library/pom.xml b/library/pom.xml
index 55bf65f5..8630b9cc 100644
--- a/library/pom.xml
+++ b/library/pom.xml
@@ -3,13 +3,13 @@
     <parent>
         <groupId>org.mustangproject</groupId>
         <artifactId>core</artifactId>
-        <version>2.18.1-SNAPSHOT</version>
+        <version>2.17.1-SNAPSHOT</version>
     </parent>
 
     <modelVersion>4.0.0</modelVersion>
     <groupId>org.mustangproject</groupId>
     <artifactId>library</artifactId>
-    <version>2.18.1-SNAPSHOT</version>
+    <version>2.17.1-SNAPSHOT</version>
     <packaging>jar</packaging>
     <name>Library to write, read and validate e-invoices (Factur-X, ZUGFeRD, Order-X, XRechnung/CII)</name>
     <description>FOSS Java library to read, write and validate european electronic invoices and orders in the UN/CEFACT
diff --git a/pom.xml b/pom.xml
index 6ceee7c1..252cdccf 100644
--- a/pom.xml
+++ b/pom.xml
@@ -3,7 +3,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>org.mustangproject</groupId>
     <artifactId>core</artifactId>
-    <version>2.18.1-SNAPSHOT</version>    <packaging>pom</packaging>
+    <version>2.17.1-SNAPSHOT</version>    <packaging>pom</packaging>
     <name>Mustang</name>
 
     <modules>
diff --git a/validator/pom.xml b/validator/pom.xml
index f5b5281a..19cc2e97 100644
--- a/validator/pom.xml
+++ b/validator/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <groupId>org.mustangproject</groupId>
         <artifactId>core</artifactId>
-        <version>2.18.1-SNAPSHOT</version>
+        <version>2.17.1-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <groupId>org.mustangproject</groupId>
@@ -11,7 +11,7 @@
     <name>Library to validate e-invoices (ZUGFeRD, Factur-X and Xrechnung)</name>
 
     <packaging>jar</packaging>
-    <version>2.18.1-SNAPSHOT</version>
+    <version>2.17.1-SNAPSHOT</version>
     <repositories>
         <repository>
             <!-- for jargs -->
@@ -38,7 +38,7 @@
         <dependency>
             <groupId>${project.groupId}</groupId>
             <artifactId>library</artifactId>
-            <version>2.18.1-SNAPSHOT</version>
+            <version>2.17.1-SNAPSHOT</version>
         </dependency>
 		<dependency>
 			<groupId>org.dom4j</groupId>