diff --git a/pom.xml b/pom.xml
index f2a92f2..ac51599 100644
--- a/pom.xml
+++ b/pom.xml
@@ -80,7 +80,7 @@
         <dependency>
             <groupId>io.reactivex</groupId>
             <artifactId>rxjava</artifactId>
-            <version>${rxjava.version}</version>
+            <version>1.3.8</version>
             <scope>provided</scope>
             <optional>true</optional>
         </dependency>
@@ -88,7 +88,7 @@
         <dependency>
             <groupId>com.google.guava</groupId>
             <artifactId>guava</artifactId>
-            <version>${guava.version}</version>
+            <version>32.0.1-jre</version>
             <scope>provided</scope>
             <optional>true</optional>
         </dependency>
@@ -99,14 +99,14 @@
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>${junit.version}</version>
+            <version>4.13.1</version>
             <scope>test</scope>
         </dependency>
 
         <dependency>
             <groupId>com.pushtorefresh.java-private-constructor-checker</groupId>
             <artifactId>checker</artifactId>
-            <version>${checker.version}</version>
+            <version>1.2.0</version>
             <scope>test</scope>
         </dependency>