diff --git a/benchmark/benchmark-junit4/proguard-rules.pro b/benchmark/benchmark-junit4/proguard-rules.pro
index 507b097..cbc8983 100644
--- a/benchmark/benchmark-junit4/proguard-rules.pro
+++ b/benchmark/benchmark-junit4/proguard-rules.pro
@@ -5,6 +5,7 @@
 -keepclasseswithmembers class org.junit.** { *; }
 -keepclasseswithmembers class junit.** { *; }
 -dontwarn com.google.errorprone.annotations.MustBeClosed
+-dontwarn com.google.errorprone.annotations.CanIgnoreReturnValue
 
 ## keep test classes
 -keepclasseswithmembers @org.junit.runner.RunWith class * { *; }
@@ -12,7 +13,13 @@
 ## needed for org.junit.Test annotation to be discoverable by reflection
 -keepattributes *Annotation*
 
+## needed for listeners instantiated by reflection (e.g. InstrumentationResultsRunListener)
+-keepclasseswithmembers class * extends androidx.test.internal.runner.listener.InstrumentationRunListener { *; }
+
 ## Needed due to b/328649293 - shouldn't be needed since they're ref'd by manifest
 ## May need to leave these in place long term to account for old gradle versions
 -keepclasseswithmembers class androidx.benchmark.junit4.AndroidBenchmarkRunner { *; }
 -keepclasseswithmembers class androidx.benchmark.IsolationActivity { *; }
+
+## Needed due to b/339085669 - shouldn't be needed as they're referenced by code
+-keepclasseswithmembers class androidx.benchmark.json.BenchmarkData$TestResult$ProfilerOutput$Type { *; }
\ No newline at end of file