diff --git a/source/detail/binary.hpp b/source/detail/binary.hpp
index a4180f20..e9088701 100644
--- a/source/detail/binary.hpp
+++ b/source/detail/binary.hpp
@@ -307,7 +307,8 @@ template<typename T>
 std::vector<T> read_vector(std::istream &in, std::size_t count)
 {
     std::vector<T> result(count, T());
-    in.read(reinterpret_cast<char *>(&result[0]), sizeof(T) * count);
+    in.read(reinterpret_cast<char *>(&result[0]),
+        static_cast<std::streamsize>(sizeof(T) * count));
 
     return result;
 }
@@ -316,7 +317,8 @@ template<typename T>
 std::basic_string<T> read_string(std::istream &in, std::size_t count)
 {
     std::basic_string<T> result(count, T());
-    in.read(reinterpret_cast<char *>(&result[0]), sizeof(T) * count);
+    in.read(reinterpret_cast<char *>(&result[0]),
+        static_cast<std::streamsize>(sizeof(T) * count));
 
     return result;
 }
diff --git a/source/detail/cryptography/compound_document.cpp b/source/detail/cryptography/compound_document.cpp
index d3f47814..42e10aae 100644
--- a/source/detail/cryptography/compound_document.cpp
+++ b/source/detail/cryptography/compound_document.cpp
@@ -43,8 +43,8 @@ int compare_keys(const std::string &left, const std::string &right)
 {
     auto to_lower = [](std::string s)
     {
-        static const auto locale = std::locale();
-        std::use_facet<std::ctype<char>>(locale).tolower(&s[0], &s[0] + s.size());
+        static const auto *locale = new std::locale();
+        std::use_facet<std::ctype<char>>(*locale).tolower(&s[0], &s[0] + s.size());
         return s;
     };
 
diff --git a/source/detail/cryptography/xlsx_crypto_consumer.cpp b/source/detail/cryptography/xlsx_crypto_consumer.cpp
index fdc53a96..be96920b 100644
--- a/source/detail/cryptography/xlsx_crypto_consumer.cpp
+++ b/source/detail/cryptography/xlsx_crypto_consumer.cpp
@@ -60,7 +60,7 @@ std::vector<std::uint8_t> decrypt_xlsx_standard(
     {
         encrypted_package_stream.read(
             reinterpret_cast<char *>(encrypted_segment.data()),
-            encrypted_segment.size());
+            static_cast<std::streamsize>(encrypted_segment.size()));
         auto decrypted_segment = xlnt::detail::aes_ecb_decrypt(encrypted_segment, key);
 
         decrypted_package.insert(
@@ -97,7 +97,7 @@ std::vector<std::uint8_t> decrypt_xlsx_agile(
 
         encrypted_package_stream.read(
             reinterpret_cast<char *>(encrypted_segment.data()),
-            encrypted_segment.size());
+            static_cast<std::streamsize>(encrypted_segment.size()));
         auto decrypted_segment = xlnt::detail::aes_cbc_decrypt(encrypted_segment, key, iv);
 
         decrypted_package.insert(
diff --git a/source/detail/cryptography/xlsx_crypto_producer.cpp b/source/detail/cryptography/xlsx_crypto_producer.cpp
index 6d1973a0..07448d8b 100644
--- a/source/detail/cryptography/xlsx_crypto_producer.cpp
+++ b/source/detail/cryptography/xlsx_crypto_producer.cpp
@@ -210,7 +210,8 @@ void write_standard_encryption_info(const encryption_info &info, std::ostream &i
     writer.write(std::uint32_t(20));
     writer.append(info.standard.encrypted_verifier_hash);
 
-    info_stream.write(reinterpret_cast<char *>(result.data()), result.size());
+    info_stream.write(reinterpret_cast<char *>(result.data()),
+        static_cast<std::streamsize>(result.size()));
 }
 
 void encrypt_xlsx_agile(
@@ -235,11 +236,12 @@ void encrypt_xlsx_agile(
         auto iv = hash(info.agile.key_encryptor.hash, salt_with_block_key);
         iv.resize(16);
 
-        auto start = plaintext.begin() + i;
+        auto start = plaintext.begin() + static_cast<std::ptrdiff_t>(i);
         auto bytes = std::min(std::size_t(length - i), std::size_t(4096));
-        std::copy(start, start + bytes, segment.begin());
+        std::copy(start, start + static_cast<std::ptrdiff_t>(bytes), segment.begin());
         auto encrypted_segment = xlnt::detail::aes_cbc_encrypt(segment, key, iv);
-        ciphertext_stream.write(reinterpret_cast<char *>(encrypted_segment.data()), bytes);
+        ciphertext_stream.write(reinterpret_cast<char *>(encrypted_segment.data()),
+	    static_cast<std::streamsize>(bytes));
 
         ++segment_index;
     }
@@ -258,11 +260,12 @@ void encrypt_xlsx_standard(
 
     for (auto i = std::size_t(0); i < length; ++i)
     {
-        auto start = plaintext.begin() + i;
+        auto start = plaintext.begin() + static_cast<std::ptrdiff_t>(i);
         auto bytes = std::min(std::size_t(length - i), std::size_t(4096));
-        std::copy(start, start + bytes, segment.begin());
+        std::copy(start, start + static_cast<std::ptrdiff_t>(bytes), segment.begin());
         auto encrypted_segment = xlnt::detail::aes_ecb_encrypt(segment, key);
-        ciphertext_stream.write(reinterpret_cast<char *>(encrypted_segment.data()), bytes);
+        ciphertext_stream.write(reinterpret_cast<char *>(encrypted_segment.data()),
+	    static_cast<std::streamsize>(bytes));
     }
 }