diff --git a/alfred-telemetry-platform/src/main/java/eu/xenit/alfred/telemetry/binder/solr/sharding/SolrShardingMetricsContainer.java b/alfred-telemetry-platform/src/main/java/eu/xenit/alfred/telemetry/binder/solr/sharding/SolrShardingMetricsContainer.java
index bb27f856..ce5fbadb 100644
--- a/alfred-telemetry-platform/src/main/java/eu/xenit/alfred/telemetry/binder/solr/sharding/SolrShardingMetricsContainer.java
+++ b/alfred-telemetry-platform/src/main/java/eu/xenit/alfred/telemetry/binder/solr/sharding/SolrShardingMetricsContainer.java
@@ -1,7 +1,6 @@
 package eu.xenit.alfred.telemetry.binder.solr.sharding;
 
-import java.util.HashMap;
-import java.util.HashSet;
+import java.lang.reflect.InvocationTargetException;
 import java.util.Map;
 import java.util.Objects;
 import java.util.Optional;
@@ -18,7 +17,7 @@
 public class SolrShardingMetricsContainer {
 
     private ShardRegistry shardRegistry;
-    private Map<Floc, HashMap<Shard, HashSet<ShardState>>> rawData;
+    private Map<Floc, Map<Shard, Set<ShardState>>> rawData;
     private long lastRefresh;
     private long ttl; // how long before the raw data will be refreshed
 
@@ -35,7 +34,7 @@ public SolrShardingMetricsContainer(ShardRegistry shardRegistry, long ttl) {
     public void refresh() {
         long now = System.currentTimeMillis();
         if (rawData == null || now - lastRefresh > ttl) {
-            rawData = shardRegistry.getFlocs();
+            rawData = getFlocsWithReflection();
         }
     }
 
@@ -64,4 +63,19 @@ public Optional<ReplicaState> getReplicaState(ShardInstance shardInstance) {
                 .map(shardState -> ReplicaState.valueOf(shardState.getPropertyBag().get(ShardRegistryImpl.INSTANCE_STATE)));
     }
 
+    /**
+     * The return type of {@link ShardRegistry#getFlocs()} changed from 'HashMap<Floc, HashMap<Shard,
+     * HashSet<ShardState>>>' to 'Map<Floc, Map<Shard, Set<ShardState>>>'. We invoke the method with reflection to catch
+     * this change.
+     */
+    private Map<Floc, Map<Shard, Set<ShardState>>> getFlocsWithReflection() {
+        try {
+            // noinspection unchecked
+            return (Map<Floc, Map<Shard, Set<ShardState>>>)
+                    shardRegistry.getClass().getMethod("getFlocs").invoke(shardRegistry);
+        } catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException e) {
+            throw new IllegalStateException("Failed to invoke ShardRegistry#getFlocs() using reflection", e);
+        }
+    }
+
 }
diff --git a/alfred-telemetry-platform/src/test/java/eu/xenit/alfred/telemetry/binder/solr/sharding/SolrShardingMetricsContainerTest.java b/alfred-telemetry-platform/src/test/java/eu/xenit/alfred/telemetry/binder/solr/sharding/SolrShardingMetricsContainerTest.java
new file mode 100644
index 00000000..4e209bfb
--- /dev/null
+++ b/alfred-telemetry-platform/src/test/java/eu/xenit/alfred/telemetry/binder/solr/sharding/SolrShardingMetricsContainerTest.java
@@ -0,0 +1,43 @@
+package eu.xenit.alfred.telemetry.binder.solr.sharding;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.contains;
+import static org.mockito.Mockito.when;
+
+import java.util.HashMap;
+import java.util.HashSet;
+import org.alfresco.repo.index.shard.Floc;
+import org.alfresco.repo.index.shard.Shard;
+import org.alfresco.repo.index.shard.ShardRegistry;
+import org.alfresco.repo.index.shard.ShardState;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+@ExtendWith(MockitoExtension.class)
+class SolrShardingMetricsContainerTest {
+
+    @Mock
+    private ShardRegistry shardRegistry;
+
+    private SolrShardingMetricsContainer container;
+
+    @BeforeEach
+    void setup() {
+        container = new SolrShardingMetricsContainer(shardRegistry);
+    }
+
+    @Test
+    void refresh() {
+        Floc floc = new Floc();
+        HashMap<Floc, HashMap<Shard, HashSet<ShardState>>> flocs = new HashMap<>();
+        flocs.put(floc, new HashMap<>());
+        when(shardRegistry.getFlocs()).thenReturn(flocs);
+
+        container.refresh();
+        assertThat(container.getFlocs(), contains(floc));
+    }
+
+}
\ No newline at end of file