diff --git a/pom.xml b/pom.xml
index 3b0c6d8..4c1f1c5 100644
--- a/pom.xml
+++ b/pom.xml
@@ -47,7 +47,7 @@
 		<dependency>
 			<groupId>org.springframework</groupId>
 			<artifactId>spring-web</artifactId>
-			<version>${spring.version}</version>
+			<version>5.3.38</version>
 		</dependency>
 		<dependency>
 			<groupId>org.skyscreamer</groupId>
@@ -62,28 +62,28 @@
 		<dependency>
 			<groupId>com.fasterxml.jackson.core</groupId>
 			<artifactId>jackson-core</artifactId>
-			<version>${jackson.version}</version>
+			<version>2.15.0</version>
 		</dependency>
 		<dependency>
 			<groupId>com.fasterxml.jackson.datatype</groupId>
 			<artifactId>jackson-datatype-jsr310</artifactId>
-			<version>${jackson.version}</version>
+			<version>2.15.0</version>
 		</dependency>
 		<dependency>
 			<groupId>com.fasterxml.jackson.module</groupId>
 			<artifactId>jackson-module-parameter-names</artifactId>
-			<version>${jackson.version}</version>
+			<version>2.15.0</version>
 		</dependency>
 		<dependency>
 			<groupId>org.junit.jupiter</groupId>
 			<artifactId>junit-jupiter-engine</artifactId>
-			<version>${junit.version}</version>
+			<version>5.8.1</version>
 			<scope>test</scope>
 		</dependency>
 		<dependency>
 			<groupId>org.junit.jupiter</groupId>
 			<artifactId>junit-jupiter-params</artifactId>
-			<version>${junit.version}</version>
+			<version>5.8.1</version>
 			<scope>test</scope>
 		</dependency>
 		<dependency>