diff --git a/third_party/mbedtls/mbedtls.gni b/third_party/mbedtls/mbedtls.gni
index 84513a631c854a..2c65b2491ecdc2 100644
--- a/third_party/mbedtls/mbedtls.gni
+++ b/third_party/mbedtls/mbedtls.gni
@@ -31,7 +31,11 @@ template("mbedtls_target") {
     ]
 
     if (is_clang) {
-      cflags += [ "-Wno-shorten-64-to-32" ]
+      cflags += [
+        "-Wno-shorten-64-to-32",
+        "-Wno-unused-but-set-variable",  # bignum.c: variable 't' set but not
+                                         # used
+      ]
     }
   }
 
diff --git a/third_party/pigweed/repo b/third_party/pigweed/repo
index 4b50d0eac2fe6b..ead209d3aa0982 160000
--- a/third_party/pigweed/repo
+++ b/third_party/pigweed/repo
@@ -1 +1 @@
-Subproject commit 4b50d0eac2fe6bc14ec46b51cd8519ca8c042e92
+Subproject commit ead209d3aa09821aa7549fbc8665ae68fe88d16f