diff --git a/pom.xml b/pom.xml
index d13519a..e8e08dc 100644
--- a/pom.xml
+++ b/pom.xml
@@ -35,7 +35,7 @@
         <dependency>
             <groupId>net.sourceforge.owlapi</groupId>
             <artifactId>owlapi-osgidistribution</artifactId>
-            <version>4.5.26</version>
+            <version>4.5.28</version>
             <scope>provided</scope>
         </dependency>
 
@@ -43,19 +43,19 @@
         <dependency>
             <groupId>net.sourceforge.owlapi</groupId>
             <artifactId>pellet-owlapi-ignazio1977</artifactId>
-            <version>${owl-api.version}</version>
+            <version>2.4.0-ignazio1977</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>net.sourceforge.owlapi</groupId>
             <artifactId>pellet-core-ignazio1977</artifactId>
-            <version>${owl-api.version}</version>
+            <version>2.4.0-ignazio1977</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>net.sourceforge.owlapi</groupId>
             <artifactId>pellet-modularity-ignazio1977</artifactId>
-            <version>${owl-api.version}</version>
+            <version>2.4.0-ignazio1977</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -69,22 +69,22 @@
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>
             <artifactId>log4j-core</artifactId>
-            <version>${log4j-core.version}</version>
+            <version>2.17.2</version>
         </dependency>
         <dependency>
             <groupId>org.topbraid</groupId>
             <artifactId>shacl</artifactId>
-            <version>${shacl.version}</version>
+            <version>1.3.2</version>
         </dependency>
         <dependency>
             <groupId>org.apache.jena</groupId>
             <artifactId>jena-arq</artifactId>
-            <version>${jena.version}</version>
+            <version>3.17.0</version>
         </dependency>
         <dependency>
             <groupId>org.apache.jena</groupId>
             <artifactId>jena-shaded-guava</artifactId>
-            <version>${jena.version}</version>
+            <version>3.17.0</version>
         </dependency>
 
         <!-- transitive dependencies, that need to be included in bundle -->
@@ -113,17 +113,17 @@
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-annotations</artifactId>
-            <version>${jackson.core.version}</version>
+            <version>2.17.0</version>
         </dependency>
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-core</artifactId>
-            <version>${jackson.core.version}</version>
+            <version>2.17.0</version>
         </dependency>
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-databind</artifactId>
-            <version>${jackson.databind.version}</version>
+            <version>2.17.0</version>
         </dependency>
 
         <dependency>
@@ -147,7 +147,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.13.0</version>
+                <version>3.9.0</version>
                 <configuration>
                     <source>1.8</source>
                     <target>1.8</target>
@@ -157,7 +157,7 @@
             <plugin>
                 <groupId>org.apache.felix</groupId>
                 <artifactId>maven-bundle-plugin</artifactId>
-                <version>5.1.9</version>
+                <version>4.2.1</version>
                 <extensions>true</extensions>
                 <configuration>
                     <instructions>