diff --git a/tools/m1_utils/update_dynamic.sh b/tools/m1_utils/update_dynamic.sh
index 9146293e4..a1a02d21c 100755
--- a/tools/m1_utils/update_dynamic.sh
+++ b/tools/m1_utils/update_dynamic.sh
@@ -3,29 +3,33 @@ set -e
 # Note: this program is the simplest version of patching a dynamic library
 # Other code should handle making frameworks, etc
 patch() {
-     EXTDIR="$(mktemp -d "${TMPDIR:-/tmp}/bazel_m1_utils.XXXXXXXX")"
-     pushd $EXTDIR > /dev/null
-     trap "rm -rf $EXTDIR" EXIT
+    EXTDIR="$(mktemp -d "${TMPDIR:-/tmp}/bazel_m1_utils.XXXXXXXX")"
+    pushd $EXTDIR > /dev/null
+    trap "rm -rf $EXTDIR" EXIT
 
-     # Attempt lipo if it's a fat binary
-     ARCHS=()
-     while read ARCH; do
-          ARCHS+=($ARCH)
-     done < <(lipo -archs "$FWF")
-     if test "${#ARCHS[@]}" -gt 1; then 
-         lipo "$FWF" -thin arm64 -output "OF.ar" || cp "$FWF" "OF.ar"
-     else
-         cp "$FWF" "OF.ar"
-     fi
+    # Attempt lipo if it's a fat binary
+    ARCHS=()
+    while read ARCH; do
+        ARCHS+=($ARCH)
+    done < <(lipo -archs "$FWF")
+    if test "${#ARCHS[@]}" -gt 1; then
+        lipo "$FWF" -thin arm64 -output "OF.ar" || cp "$FWF" "OF.ar"
+    else
+        cp "$FWF" "OF.ar"
+    fi
 
-     # FIXME: Versions should be input from the build system
-     xcrun vtool -arch arm64 -set-build-version 7 11.0 11.0 -replace -output "$OF" "OF.ar"
+    # FIXME: Versions should be input from the build system
+    # filter stderr to ignore code signature warnings
+    xcrun vtool -arch arm64 -set-build-version 7 11.0 11.0 -replace -output "$OF" "OF.ar" \
+        2> >(grep --invert 'warning: code signature will be invalid' >&2)
 
-     # Xcode 13.1-13.2.1 workaround - see update_static.sh
-     strip -S "$OF"
+    # Xcode 13.1-13.2.1 workaround - see update_static.sh
+    # filter stderr to ignore code signature warnings
+    strip -S "$OF" \
+        2> >(grep --invert 'warning: changes being made to the file will invalidate the code signature' >&2)
 }
 
-# Framework file 
+# Framework file
 export FWF="$1"
 
 # Output file