diff --git a/pom.xml b/pom.xml
index e8353cd..e68e28c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -77,23 +77,23 @@
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-api</artifactId>
-            <version>${slf4j-api.version}</version>
+            <version>1.7.21</version>
         </dependency>
         <dependency>
             <groupId>com.google.guava</groupId>
             <artifactId>guava</artifactId>
-            <version>${guava.version}</version>
+            <version>32.0.1-jre</version>
         </dependency>
         <dependency>
             <groupId>com.github.phantomthief</groupId>
             <artifactId>more-lambdas</artifactId>
-            <version>${more-lambdas.version}</version>
+            <version>0.1.53</version>
         </dependency>
 
         <dependency>
             <groupId>com.google.code.findbugs</groupId>
             <artifactId>jsr305</artifactId>
-            <version>${jsr305.version}</version>
+            <version>3.0.2</version>
             <optional>true</optional><!-- needed only for annotations -->
         </dependency>
 
@@ -110,7 +110,7 @@
         <dependency>
             <groupId>ch.qos.logback</groupId>
             <artifactId>logback-classic</artifactId>
-            <version>${logback-classic.version}</version>
+            <version>5.9.0</version>
             <scope>test</scope>
         </dependency>
     </dependencies>