diff --git a/source/unified-test-format/schema-1.20.json b/source/unified-test-format/schema-1.20.json
index 00f01bfffd..de1d5b75b2 100644
--- a/source/unified-test-format/schema-1.20.json
+++ b/source/unified-test-format/schema-1.20.json
@@ -144,7 +144,9 @@
                   "connectionCheckedOutEvent",
                   "connectionCheckedInEvent",
                   "serverDescriptionChangedEvent",
-                  "topologyDescriptionChangedEvent"
+                  "topologyDescriptionChangedEvent",
+                  "topologyOpeningEvent",
+                  "topologyClosedEvent"
                 ]
               }
             },
diff --git a/source/unified-test-format/schema-1.21.json b/source/unified-test-format/schema-1.21.json
index 9d22fe6209..09c3a6882f 100644
--- a/source/unified-test-format/schema-1.21.json
+++ b/source/unified-test-format/schema-1.21.json
@@ -144,7 +144,9 @@
                   "connectionCheckedOutEvent",
                   "connectionCheckedInEvent",
                   "serverDescriptionChangedEvent",
-                  "topologyDescriptionChangedEvent"
+                  "topologyDescriptionChangedEvent",
+                  "topologyOpeningEvent",
+                  "topologyClosedEvent"
                 ]
               }
             },
diff --git a/source/unified-test-format/schema-1.22.json b/source/unified-test-format/schema-1.22.json
index 185fbbf620..64d6d48422 100644
--- a/source/unified-test-format/schema-1.22.json
+++ b/source/unified-test-format/schema-1.22.json
@@ -144,7 +144,9 @@
                   "connectionCheckedOutEvent",
                   "connectionCheckedInEvent",
                   "serverDescriptionChangedEvent",
-                  "topologyDescriptionChangedEvent"
+                  "topologyDescriptionChangedEvent",
+                  "topologyOpeningEvent",
+                  "topologyClosedEvent"
                 ]
               }
             },
@@ -1116,4 +1118,4 @@
       }
     }
   }
-}
\ No newline at end of file
+}
diff --git a/source/unified-test-format/schema-1.23.json b/source/unified-test-format/schema-1.23.json
index b454199b05..c40ddaf405 100644
--- a/source/unified-test-format/schema-1.23.json
+++ b/source/unified-test-format/schema-1.23.json
@@ -144,7 +144,9 @@
                   "connectionCheckedOutEvent",
                   "connectionCheckedInEvent",
                   "serverDescriptionChangedEvent",
-                  "topologyDescriptionChangedEvent"
+                  "topologyDescriptionChangedEvent",
+                  "topologyOpeningEvent",
+                  "topologyClosedEvent"
                 ]
               }
             },
@@ -1156,4 +1158,4 @@
       }
     }
   }
-}
\ No newline at end of file
+}
diff --git a/source/unified-test-format/schema-latest.json b/source/unified-test-format/schema-latest.json
index b454199b05..c40ddaf405 100644
--- a/source/unified-test-format/schema-latest.json
+++ b/source/unified-test-format/schema-latest.json
@@ -144,7 +144,9 @@
                   "connectionCheckedOutEvent",
                   "connectionCheckedInEvent",
                   "serverDescriptionChangedEvent",
-                  "topologyDescriptionChangedEvent"
+                  "topologyDescriptionChangedEvent",
+                  "topologyOpeningEvent",
+                  "topologyClosedEvent"
                 ]
               }
             },
@@ -1156,4 +1158,4 @@
       }
     }
   }
-}
\ No newline at end of file
+}
diff --git a/source/unified-test-format/unified-test-format.md b/source/unified-test-format/unified-test-format.md
index a2c0522eb2..1d9f47ccbf 100644
--- a/source/unified-test-format/unified-test-format.md
+++ b/source/unified-test-format/unified-test-format.md
@@ -485,6 +485,8 @@ The structure of this object is as follows:
         - [serverHeartbeatSucceededEvent](#expectedEvent_serverHeartbeatSucceededEvent)
         - [serverHeartbeatFailedEvent](#expectedEvent_serverHeartbeatFailedEvent)
         - [topologyDescriptionChangedEvent](#expectedEvent_topologyDescriptionChangedEvent)
+        - [topologyOpeningEvent](#expectedEvent_topologyOpeningEvent)
+        - [topologyClosedEvent](#expectedEvent_topologyClosedEvent)
 
     <span id="entity_client_ignoreCommandMonitoringEvents"></span>
 
@@ -1231,6 +1233,18 @@ The structure of this object is as follows:
         Test runners SHOULD ignore any other fields present on the `previousDescription` and `newDescription` fields of the
         captured `topologyDescriptionChangedEvent`.
 
+<span id="expectedEvent_topologyOpeningEvent"></span>
+
+- `topologyOpeningEvent`: Optional object. Assertions for one
+    [topologyOpeningEvent](../server-discovery-and-monitoring/server-discovery-and-monitoring-logging-and-monitoring.md#events-api)
+    object.
+
+<span id="expectedEvent_topologyClosedEvent"></span>
+
+- `topologyClosedEvent`: Optional object. Assertions for one
+    [topologyClosedEvent](../server-discovery-and-monitoring/server-discovery-and-monitoring-logging-and-monitoring.md#events-api)
+    object.
+
 ##### hasServiceId
 
 This field is an optional boolean that specifies whether or not the `serviceId` field of an event is set. If true, test
@@ -3555,6 +3569,9 @@ other specs *and* collating spec changes developed in parallel or during the sam
 
 ## Changelog
 
+- 2025-04-07: Add `topologyOpeningEvent` and `topologyClosedEvent` to the unified test format and schema 1.20+ as they
+  were omitted in error.
+
 - 2025-01-21: **Schema version 1.23.**
 
     Support automatic encryption. Add `autoEncryptOpts` to `client` entity.