diff --git a/external/tsan.supp b/external/tsan.supp
index 7b73e8874b..d343ba08c4 100644
--- a/external/tsan.supp
+++ b/external/tsan.supp
@@ -53,3 +53,9 @@ deadlock:.*/src/libxrpl/beast/utility/beast_Journal.cpp
 deadlock:.*/src/libxrpl/beast/utility/beast_PropertyStream.cpp
 deadlock:.*/src/test/beast/beast_PropertyStream_test.cpp
 deadlock:.*/src/xrpld/core/detail/Workers.cpp
+
+# Additional deadlock suppressions by function name
+deadlock:beast::PropertyStream::Source::find_one
+deadlock:beast::PropertyStream::Source::find_one_deep
+deadlock:beast::PropertyStream_test::test_find_one_deep
+deadlock:beast::PropertyStream_test::run
diff --git a/external/ubsan.supp b/external/ubsan.supp
index cf1a8c5ca9..1891d16873 100644
--- a/external/ubsan.supp
+++ b/external/ubsan.supp
@@ -118,6 +118,8 @@ unsigned-integer-overflow:.*/xrpl/nodestore/detail/varint.h
 unsigned-integer-overflow:.*/xrpl/peerfinder/detail/Counts.h
 unsigned-integer-overflow:.*/xrpl/protocol/nft.h
 
+signed-integer-overflow:.*/src/test/beast/LexicalCast_test.cpp
+
 # External library suppressions
 unsigned-integer-overflow:.*/nudb/detail/xxhash.hpp