diff --git a/build.gradle b/build.gradle
index 7bc3a4fff..e689da617 100644
--- a/build.gradle
+++ b/build.gradle
@@ -209,14 +209,14 @@ dependencies {
     // capabilities, but Caffeine's LoadingCache syntax is more modern idiomatic Java than Guava's.
     implementation 'com.github.ben-manes.caffeine:caffeine:2.8.1'
 
-    implementation ('org.apache.httpcomponents:httpclient:4.5.6') {
+    implementation ('org.apache.httpcomponents:httpclient:4.5.13') {
         because 'Force use of version used by AWS SDK instead of other versions used by our transitive dependencies.'
         // TODO eventually migrate over to Java's built-in HTTP client.
     }
 
     // Persistent storage of files / objects on Amazon S3.
     // Now used only for Seamless Census TODO eliminate this final AWS dependency
-    implementation 'com.amazonaws:aws-java-sdk-s3:1.11.341'
+    implementation 'com.amazonaws:aws-java-sdk-s3:1.12.583'
 
     // Commons Math gives us FastMath, MersenneTwister, and low-discrepancy vector generators.
     implementation 'org.apache.commons:commons-math3:3.0'