diff --git a/lib/core/base.sh b/lib/core/base.sh
index e89445e..ad47c30 100644
--- a/lib/core/base.sh
+++ b/lib/core/base.sh
@@ -288,9 +288,12 @@ register_temp_dir() {
 }
 
 # Create temp file with prefix (for analyze.sh compatibility)
+# Compatible with both BSD mktemp (macOS default) and GNU mktemp (coreutils)
 mktemp_file() {
     local prefix="${1:-mole}"
-    mktemp -t "$prefix"
+    # Use TMPDIR if set, otherwise /tmp
+    # Add .XXXXXX suffix to work with both BSD and GNU mktemp
+    mktemp "${TMPDIR:-/tmp}/${prefix}.XXXXXX"
 }
 
 # Cleanup all tracked temp files and directories
diff --git a/lib/manage/update.sh b/lib/manage/update.sh
index 00ae1da..396d9a5 100644
--- a/lib/manage/update.sh
+++ b/lib/manage/update.sh
@@ -278,7 +278,7 @@ perform_updates() {
 _perform_appstore_update() {
     echo -e "${BLUE}Updating App Store apps...${NC}"
     local appstore_log
-    appstore_log=$(mktemp -t mole-appstore 2> /dev/null || echo "/tmp/mole-appstore.log")
+    appstore_log=$(mktemp "${TMPDIR:-/tmp}/mole-appstore.XXXXXX" 2> /dev/null || echo "/tmp/mole-appstore.log")
 
     if [[ "$appstore_needs_fallback" == "true" ]]; then
         echo -e "  ${GRAY}Installing all available updates${NC}"
@@ -311,7 +311,7 @@ _perform_macos_update() {
     echo -e "${YELLOW}Note:${NC} System update may require restart"
 
     local macos_log
-    macos_log=$(mktemp -t mole-macos 2> /dev/null || echo "/tmp/mole-macos.log")
+    macos_log=$(mktemp "${TMPDIR:-/tmp}/mole-macos.XXXXXX" 2> /dev/null || echo "/tmp/mole-macos.log")
 
     if [[ "$macos_needs_fallback" == "true" ]]; then
         if sudo softwareupdate -i -r 2>&1 | tee "$macos_log" | grep -v "^$"; then