diff --git a/service/src/main/java/org/whispersystems/textsecuregcm/storage/AccountsManager.java b/service/src/main/java/org/whispersystems/textsecuregcm/storage/AccountsManager.java
index 2d5926db3..92c306491 100644
--- a/service/src/main/java/org/whispersystems/textsecuregcm/storage/AccountsManager.java
+++ b/service/src/main/java/org/whispersystems/textsecuregcm/storage/AccountsManager.java
@@ -18,6 +18,7 @@ import io.micrometer.core.instrument.Metrics;
 import io.micrometer.core.instrument.Tags;
 import java.io.IOException;
 import java.time.Clock;
+import java.time.Duration;
 import java.util.List;
 import java.util.Objects;
 import java.util.Optional;
@@ -79,6 +80,12 @@ public class AccountsManager {
   private final ObjectMapper mapper;
   private final Clock clock;
 
+  // An account that's used at least daily will get reset in the cache at least once per day when its "last seen"
+  // timestamp updates; expiring entries after two days will help clear out "zombie" cache entries that are read
+  // frequently (e.g. the account is in an active group and receives messages frequently), but aren't actively used by
+  // the owner.
+  private static final long CACHE_TTL_SECONDS = Duration.ofDays(2).toSeconds();
+
   public enum DeletionReason {
     ADMIN_DELETED("admin"),
     EXPIRED      ("expired"),
@@ -476,10 +483,9 @@ public class AccountsManager {
       cacheCluster.useCluster(connection -> {
         final RedisAdvancedClusterCommands<String, String> commands = connection.sync();
 
-
-        commands.set(getAccountMapKey(account.getPhoneNumberIdentifier().toString()), account.getUuid().toString());
-        commands.set(getAccountMapKey(account.getNumber()), account.getUuid().toString());
-        commands.set(getAccountEntityKey(account.getUuid()), accountJson);
+        commands.setex(getAccountMapKey(account.getPhoneNumberIdentifier().toString()), CACHE_TTL_SECONDS, account.getUuid().toString());
+        commands.setex(getAccountMapKey(account.getNumber()), CACHE_TTL_SECONDS, account.getUuid().toString());
+        commands.setex(getAccountEntityKey(account.getUuid()), CACHE_TTL_SECONDS, accountJson);
       });
     } catch (JsonProcessingException e) {
       throw new IllegalStateException(e);
diff --git a/service/src/test/java/org/whispersystems/textsecuregcm/storage/AccountsManagerConcurrentModificationIntegrationTest.java b/service/src/test/java/org/whispersystems/textsecuregcm/storage/AccountsManagerConcurrentModificationIntegrationTest.java
index 366bbe852..db6ca8897 100644
--- a/service/src/test/java/org/whispersystems/textsecuregcm/storage/AccountsManagerConcurrentModificationIntegrationTest.java
+++ b/service/src/test/java/org/whispersystems/textsecuregcm/storage/AccountsManagerConcurrentModificationIntegrationTest.java
@@ -10,6 +10,7 @@ import static org.junit.jupiter.api.Assertions.assertArrayEquals;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyLong;
 import static org.mockito.ArgumentMatchers.anyString;
 import static org.mockito.Mockito.atLeast;
 import static org.mockito.Mockito.doAnswer;
@@ -229,7 +230,7 @@ class AccountsManagerConcurrentModificationIntegrationTest {
   private Account getLastAccountFromRedisMock(RedisAdvancedClusterCommands<String, String> commands) throws IOException {
     ArgumentCaptor<String> redisSetArgumentCapture = ArgumentCaptor.forClass(String.class);
 
-    verify(commands, atLeast(20)).set(anyString(), redisSetArgumentCapture.capture());
+    verify(commands, atLeast(20)).setex(anyString(), anyLong(), redisSetArgumentCapture.capture());
 
     return JsonHelpers.fromJson(redisSetArgumentCapture.getValue(), Account.class);
   }
diff --git a/service/src/test/java/org/whispersystems/textsecuregcm/tests/storage/AccountsManagerTest.java b/service/src/test/java/org/whispersystems/textsecuregcm/tests/storage/AccountsManagerTest.java
index 5df767be7..99d932d2a 100644
--- a/service/src/test/java/org/whispersystems/textsecuregcm/tests/storage/AccountsManagerTest.java
+++ b/service/src/test/java/org/whispersystems/textsecuregcm/tests/storage/AccountsManagerTest.java
@@ -10,6 +10,7 @@ import static org.junit.jupiter.api.Assertions.assertSame;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyLong;
 import static org.mockito.ArgumentMatchers.argThat;
 import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.Mockito.anyString;
@@ -221,9 +222,9 @@ class AccountsManagerTest {
     assertSame(retrieved.get(), account);
 
     verify(commands, times(1)).get(eq("AccountMap::+14152222222"));
-    verify(commands, times(1)).set(eq("AccountMap::+14152222222"), eq(uuid.toString()));
-    verify(commands, times(1)).set(eq("AccountMap::" + pni), eq(uuid.toString()));
-    verify(commands, times(1)).set(eq("Account3::" + uuid), anyString());
+    verify(commands, times(1)).setex(eq("AccountMap::+14152222222"), anyLong(), eq(uuid.toString()));
+    verify(commands, times(1)).setex(eq("AccountMap::" + pni), anyLong(), eq(uuid.toString()));
+    verify(commands, times(1)).setex(eq("Account3::" + uuid), anyLong(), anyString());
     verifyNoMoreInteractions(commands);
 
     verify(accounts, times(1)).getByE164(eq("+14152222222"));
@@ -245,9 +246,9 @@ class AccountsManagerTest {
     assertSame(retrieved.get(), account);
 
     verify(commands, times(1)).get(eq("Account3::" + uuid));
-    verify(commands, times(1)).set(eq("AccountMap::+14152222222"), eq(uuid.toString()));
-    verify(commands, times(1)).set(eq("AccountMap::" + pni), eq(uuid.toString()));
-    verify(commands, times(1)).set(eq("Account3::" + uuid), anyString());
+    verify(commands, times(1)).setex(eq("AccountMap::+14152222222"), anyLong(), eq(uuid.toString()));
+    verify(commands, times(1)).setex(eq("AccountMap::" + pni), anyLong(), eq(uuid.toString()));
+    verify(commands, times(1)).setex(eq("Account3::" + uuid), anyLong(), anyString());
     verifyNoMoreInteractions(commands);
 
     verify(accounts, times(1)).getByAccountIdentifier(eq(uuid));
@@ -270,9 +271,9 @@ class AccountsManagerTest {
     assertSame(retrieved.get(), account);
 
     verify(commands).get(eq("AccountMap::" + pni));
-    verify(commands).set(eq("AccountMap::" + pni), eq(uuid.toString()));
-    verify(commands).set(eq("AccountMap::+14152222222"), eq(uuid.toString()));
-    verify(commands).set(eq("Account3::" + uuid), anyString());
+    verify(commands).setex(eq("AccountMap::" + pni), anyLong(), eq(uuid.toString()));
+    verify(commands).setex(eq("AccountMap::+14152222222"), anyLong(), eq(uuid.toString()));
+    verify(commands).setex(eq("Account3::" + uuid), anyLong(), anyString());
     verifyNoMoreInteractions(commands);
 
     verify(accounts).getByPhoneNumberIdentifier(pni);
@@ -294,9 +295,9 @@ class AccountsManagerTest {
     assertSame(retrieved.get(), account);
 
     verify(commands, times(1)).get(eq("AccountMap::+14152222222"));
-    verify(commands, times(1)).set(eq("AccountMap::+14152222222"), eq(uuid.toString()));
-    verify(commands, times(1)).set(eq("AccountMap::" + pni), eq(uuid.toString()));
-    verify(commands, times(1)).set(eq("Account3::" + uuid), anyString());
+    verify(commands, times(1)).setex(eq("AccountMap::+14152222222"), anyLong(), eq(uuid.toString()));
+    verify(commands, times(1)).setex(eq("AccountMap::" + pni), anyLong(), eq(uuid.toString()));
+    verify(commands, times(1)).setex(eq("Account3::" + uuid), anyLong(), anyString());
     verifyNoMoreInteractions(commands);
 
     verify(accounts, times(1)).getByE164(eq("+14152222222"));
@@ -318,9 +319,9 @@ class AccountsManagerTest {
     assertSame(retrieved.get(), account);
 
     verify(commands, times(1)).get(eq("Account3::" + uuid));
-    verify(commands, times(1)).set(eq("AccountMap::+14152222222"), eq(uuid.toString()));
-    verify(commands, times(1)).set(eq("AccountMap::" + pni), eq(uuid.toString()));
-    verify(commands, times(1)).set(eq("Account3::" + uuid), anyString());
+    verify(commands, times(1)).setex(eq("AccountMap::+14152222222"), anyLong(), eq(uuid.toString()));
+    verify(commands, times(1)).setex(eq("AccountMap::" + pni), anyLong(), eq(uuid.toString()));
+    verify(commands, times(1)).setex(eq("Account3::" + uuid), anyLong(), anyString());
     verifyNoMoreInteractions(commands);
 
     verify(accounts, times(1)).getByAccountIdentifier(eq(uuid));
@@ -343,9 +344,9 @@ class AccountsManagerTest {
     assertSame(retrieved.get(), account);
 
     verify(commands).get(eq("AccountMap::" + pni));
-    verify(commands).set(eq("AccountMap::" + pni), eq(uuid.toString()));
-    verify(commands).set(eq("AccountMap::+14152222222"), eq(uuid.toString()));
-    verify(commands).set(eq("Account3::" + uuid), anyString());
+    verify(commands).setex(eq("AccountMap::" + pni), anyLong(), eq(uuid.toString()));
+    verify(commands).setex(eq("AccountMap::+14152222222"), anyLong(), eq(uuid.toString()));
+    verify(commands).setex(eq("Account3::" + uuid), anyLong(), anyString());
     verifyNoMoreInteractions(commands);
 
     verify(accounts).getByPhoneNumberIdentifier(pni);