diff --git a/src/fru_utils.hpp b/src/fru_utils.hpp
index dcd9752..b427c25 100644
--- a/src/fru_utils.hpp
+++ b/src/fru_utils.hpp
@@ -114,25 +114,25 @@
 
 char bcdPlusToChar(uint8_t val);
 
-bool verifyOffset(const std::vector<uint8_t>& fruBytes, fruAreas currentArea,
+bool verifyOffset(std::span<const uint8_t> fruBytes, fruAreas currentArea,
                   uint8_t len);
 
 std::pair<DecodeState, std::string> decodeFRUData(
-    std::vector<uint8_t>::const_iterator& iter,
-    const std::vector<uint8_t>::const_iterator& end, bool isLangEng);
+    std::span<const uint8_t>::const_iterator& iter,
+    std::span<const uint8_t>::const_iterator& end, bool isLangEng);
 
 bool checkLangEng(uint8_t lang);
 
 resCodes formatIPMIFRU(
-    const std::vector<uint8_t>& fruBytes,
+    std::span<const uint8_t> fruBytes,
     boost::container::flat_map<std::string, std::string>& result);
 
 std::vector<uint8_t>& getFRUInfo(const uint16_t& bus, const uint8_t& address);
 
-uint8_t calculateChecksum(std::vector<uint8_t>::const_iterator iter,
-                          std::vector<uint8_t>::const_iterator end);
+uint8_t calculateChecksum(std::span<const uint8_t>::const_iterator iter,
+                          std::span<const uint8_t>::const_iterator end);
 
-uint8_t calculateChecksum(std::vector<uint8_t>& fruAreaData);
+uint8_t calculateChecksum(std::span<const uint8_t> fruAreaData);
 
 unsigned int updateFRUAreaLenAndChecksum(
     std::vector<uint8_t>& fruData, size_t fruAreaStart,