diff --git a/internal/spectest/skip.go b/internal/spectest/skip.go
index f974fbbbe..92c3219c6 100644
--- a/internal/spectest/skip.go
+++ b/internal/spectest/skip.go
@@ -804,6 +804,14 @@ var skipTests = map[string][]string{
 		"TestUnifiedSpec/transactions/tests/unified/transaction-options.json/startTransaction_options_override_defaults",
 		"TestUnifiedSpec/transactions/tests/unified/transaction-options.json/defaultTransactionOptions_override_client_options",
 	},
+
+	// TODO(GODRIVER-3874): Send afterClusterTime on writes in
+	// causally-consistent sessions.
+	"Send afterClusterTime on writes in causally-consistent sessions (GODRIVER-3874)": {
+		"TestUnifiedSpec/transactions/tests/unified/commit.json/reset_session_state_commit",
+		"TestUnifiedSpec/transactions/tests/unified/commit.json/reset_session_state_abort",
+		"TestUnifiedSpec/transactions/tests/unified/retryable-writes.json/increment_txnNumber",
+	},
 }
 
 // CheckSkip checks if the fully-qualified test name matches a list of skipped test names for a given reason.
diff --git a/testdata/specifications b/testdata/specifications
index 62028fdf2..2a6fa8200 160000
--- a/testdata/specifications
+++ b/testdata/specifications
@@ -1 +1 @@
-Subproject commit 62028fdf28c7b56efe87fe2b44663eab7174c2f7
+Subproject commit 2a6fa82001933c9997305cac8f18006a95dcef25