diff --git a/pom.xml b/pom.xml
index af732c4..64fc0b1 100644
--- a/pom.xml
+++ b/pom.xml
@@ -96,46 +96,46 @@
         <dependency>
             <groupId>software.amazon.awssdk</groupId>
             <artifactId>apache-client</artifactId>
-            <version>${aws.java.sdk.version}</version>
+            <version>2.19.18</version>
         </dependency>
         <dependency>
             <groupId>software.amazon.awssdk</groupId>
             <artifactId>qldbsession</artifactId>
-            <version>${aws.java.sdk.version}</version>
+            <version>2.21.11</version>
         </dependency>
         <dependency>
             <groupId>com.amazon.ion</groupId>
             <artifactId>ion-java</artifactId>
-            <version>${ion.version}</version>
+            <version>1.10.5</version>
         </dependency>
         <dependency>
             <groupId>com.amazon.ion</groupId>
             <artifactId>ion-hash-java</artifactId>
-            <version>${ion.hash.version}</version>
+            <version>1.0.0</version>
         </dependency>
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-api</artifactId>
-            <version>${slf4j.api.version}</version>
+            <version>2.0.6</version>
         </dependency>
 
         <!-- test dependencies -->
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter</artifactId>
-            <version>${junit.jupiter.version}</version>
+            <version>5.9.1</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>org.mockito</groupId>
             <artifactId>mockito-core</artifactId>
-            <version>${mockito.core.version}</version>
+            <version>5.0.0</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>software.amazon.awssdk</groupId>
             <artifactId>qldb</artifactId>
-            <version>${aws.java.sdk.version}</version>
+            <version>2.21.11</version>
             <scope>test</scope>
         </dependency>
     </dependencies>