diff --git a/Config.cmake b/Config.cmake
index 1032ce379..b5394225d 100644
--- a/Config.cmake
+++ b/Config.cmake
@@ -87,7 +87,7 @@ set(ODBFLAGS
   --default-pointer "std::shared_ptr")
 
 # Set CXX standard
-set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
 
diff --git a/parser/src/pluginhandler.cpp b/parser/src/pluginhandler.cpp
index 7fe6c91e1..e656e31de 100644
--- a/parser/src/pluginhandler.cpp
+++ b/parser/src/pluginhandler.cpp
@@ -44,7 +44,7 @@ void PluginHandler::loadPlugins(std::vector<std::string>& skipParserList_)
     ++dirIter)
   {
     if (fs::is_regular_file(dirIter->status()) &&
-        fs::extension(*dirIter) == util::DynamicLibrary::extension())
+        fs::path(*dirIter).extension() == util::DynamicLibrary::extension())
     {
       std::string filename = getPluginName(dirIter->path());
 
@@ -85,7 +85,7 @@ std::vector<std::string> PluginHandler::getPluginNames() const
     ++dirIter)
   {
     if (fs::is_regular_file(dirIter->status()) &&
-        fs::extension(*dirIter) == util::DynamicLibrary::extension())
+        fs::path(*dirIter).extension() == util::DynamicLibrary::extension())
     {
       plugins.push_back(getPluginName(dirIter->path()));
     }
diff --git a/plugins/cpp/parser/include/cppparser/filelocutil.h b/plugins/cpp/parser/include/cppparser/filelocutil.h
index 221f696c0..04e0734cd 100644
--- a/plugins/cpp/parser/include/cppparser/filelocutil.h
+++ b/plugins/cpp/parser/include/cppparser/filelocutil.h
@@ -91,7 +91,7 @@ class FileLocUtil
     if (fid.isInvalid())
       return std::string();
 
-    const clang::FileEntry* fileEntry = _clangSrcMan.getFileEntryForID(fid);
+    const clang::OptionalFileEntryRef fileEntry = _clangSrcMan.getFileEntryRefForID(fid);
     if (!fileEntry)
       return std::string();
 
diff --git a/plugins/cpp/parser/src/clangastvisitor.h b/plugins/cpp/parser/src/clangastvisitor.h
index cfcaf8604..10683fd65 100644
--- a/plugins/cpp/parser/src/clangastvisitor.h
+++ b/plugins/cpp/parser/src/clangastvisitor.h
@@ -1735,7 +1735,7 @@ class ClangASTVisitor : public clang::RecursiveASTVisitor<ClangASTVisitor>
       clang::DynTypedNodeList parents
         = _astContext.getParents(*expr_);
 
-      const clang::ast_type_traits::DynTypedNode& parent = parents[0];
+      const clang::DynTypedNode& parent = parents[0];
 
       if (const clang::BinaryOperator* op = parent.get<clang::BinaryOperator>())
       {
diff --git a/plugins/cpp/parser/src/cppparser.cpp b/plugins/cpp/parser/src/cppparser.cpp
index 58620801c..ac7ac5d4b 100644
--- a/plugins/cpp/parser/src/cppparser.cpp
+++ b/plugins/cpp/parser/src/cppparser.cpp
@@ -159,7 +159,7 @@ bool CppParser::isSourceFile(const std::string& file_) const
   const std::vector<std::string> cppExts{
     ".c", ".cc", ".cpp", ".cxx", ".o", ".so", ".a"};
 
-  std::string ext = fs::extension(file_);
+  std::string ext = fs::path(file_).extension().string();
   std::transform(ext.begin(), ext.end(), ext.begin(), ::tolower);
 
   return std::find(cppExts.begin(), cppExts.end(), ext) != cppExts.end();
@@ -209,7 +209,7 @@ std::map<std::string, std::string> CppParser::extractInputOutputs(
   {
     for (const std::string& src : sources)
     {
-      std::string extension = fs::extension(src);
+      std::string extension = fs::path(src).extension().string();
       inToOut[src] = src.substr(0, src.size() - extension.size() - 1) + ".o";
     }
   }
@@ -232,7 +232,7 @@ model::BuildActionPtr CppParser::addBuildAction(
 
   model::BuildActionPtr buildAction(new model::BuildAction);
 
-  std::string extension = fs::extension(command_.Filename);
+  std::string extension = fs::path(command_.Filename).extension().string();
 
   buildAction->command = boost::algorithm::join(command_.CommandLine, " ");
   buildAction->type
diff --git a/plugins/cpp/parser/src/doccommentformatter.cpp b/plugins/cpp/parser/src/doccommentformatter.cpp
index 1d2439b1d..9d495dbfa 100644
--- a/plugins/cpp/parser/src/doccommentformatter.cpp
+++ b/plugins/cpp/parser/src/doccommentformatter.cpp
@@ -58,10 +58,10 @@ FullCommentParts::FullCommentParts(
 
     switch (child->getCommentKind())
     {
-      case Comment::NoCommentKind:
+      case CommentKind::None:
         continue;
 
-      case Comment::ParagraphCommentKind:
+      case CommentKind::ParagraphComment:
       {
         const ParagraphComment* pc = llvm::cast<ParagraphComment>(child);
 
@@ -75,7 +75,7 @@ FullCommentParts::FullCommentParts(
         break;
       }
 
-      case Comment::BlockCommandCommentKind:
+      case CommentKind::BlockCommandComment:
       {
         const BlockCommandComment* bcc = llvm::cast<BlockCommandComment>(child);
         const CommandInfo* Info = traits_.getCommandInfo(bcc->getCommandID());
@@ -94,7 +94,7 @@ FullCommentParts::FullCommentParts(
         break;
       }
 
-      case Comment::ParamCommandCommentKind:
+      case CommentKind::ParamCommandComment:
       {
         const ParamCommandComment* pcc = llvm::cast<ParamCommandComment>(child);
 
@@ -108,7 +108,7 @@ FullCommentParts::FullCommentParts(
         break;
       }
 
-      case Comment::TParamCommandCommentKind:
+      case CommentKind::TParamCommandComment:
       {
         const TParamCommandComment* tpcc
           = llvm::cast<TParamCommandComment>(child);
@@ -123,11 +123,11 @@ FullCommentParts::FullCommentParts(
         break;
       }
 
-      case Comment::VerbatimBlockCommentKind:
+      case CommentKind::VerbatimBlockComment:
         _miscBlocks.push_back(cast<BlockCommandComment>(child));
         break;
 
-      case Comment::VerbatimLineCommentKind:
+      case CommentKind::VerbatimLineComment:
       {
         const VerbatimLineComment* vlc = llvm::cast<VerbatimLineComment>(child);
         const CommandInfo* Info = traits_.getCommandInfo(vlc->getCommandID());
@@ -251,22 +251,22 @@ void CommentToMarkdownConverter::visitInlineCommandComment(
 
   switch (c_->getRenderKind())
   {
-    case InlineCommandComment::RenderNormal:
+    case InlineCommandRenderKind::Normal:
       for (unsigned i = 0, e = c_->getNumArgs(); i != e; ++i)
         _res << c_->getArgText(i).str() << ' ';
       return;
 
-    case InlineCommandComment::RenderBold:
+    case InlineCommandRenderKind::Bold:
       assert(c_->getNumArgs() == 1);
       _res << "**" << arg0.str() << "**";
       return;
 
-    case InlineCommandComment::RenderMonospaced:
+    case InlineCommandRenderKind::Monospaced:
       assert(c_->getNumArgs() == 1);
       _res << '`' << arg0.str() << '`';
       return;
 
-    case InlineCommandComment::RenderEmphasized:
+    case InlineCommandRenderKind::Emphasized:
       assert(c_->getNumArgs() == 1);
       _res << '*' << arg0.str() << '*';
       return;
@@ -336,9 +336,9 @@ void CommentToMarkdownConverter::visitParamCommandComment(
 {
   switch (c_->getDirection())
   {
-    case ParamCommandComment::In:    _res << "- *in*: ";     break;
-    case ParamCommandComment::Out:   _res << "- *out*: ";    break;
-    case ParamCommandComment::InOut: _res << "- *in,out*: "; break;
+    case ParamCommandPassDirection::In:    _res << "- *in*: ";     break;
+    case ParamCommandPassDirection::Out:   _res << "- *out*: ";    break;
+    case ParamCommandPassDirection::InOut: _res << "- *in,out*: "; break;
   }
 
   _res << "**" << (c_->isParamIndexValid()
diff --git a/plugins/cpp/parser/src/ppincludecallback.cpp b/plugins/cpp/parser/src/ppincludecallback.cpp
index b163732fe..3aeb2a9ca 100644
--- a/plugins/cpp/parser/src/ppincludecallback.cpp
+++ b/plugins/cpp/parser/src/ppincludecallback.cpp
@@ -61,10 +61,11 @@ void PPIncludeCallback::InclusionDirective(
   clang::StringRef fileName_,
   bool,
   clang::CharSourceRange filenameRange_,
-  const clang::FileEntry*,
+  clang::OptionalFileEntryRef,
   clang::StringRef searchPath_,
   clang::StringRef,
   const clang::Module*,
+  bool,
   clang::SrcMgr::CharacteristicKind)
 {
   if (searchPath_.empty())
diff --git a/plugins/cpp/parser/src/ppincludecallback.h b/plugins/cpp/parser/src/ppincludecallback.h
index df3a96676..abaf55871 100644
--- a/plugins/cpp/parser/src/ppincludecallback.h
+++ b/plugins/cpp/parser/src/ppincludecallback.h
@@ -38,10 +38,11 @@ class PPIncludeCallback : public clang::PPCallbacks
     clang::StringRef FileName,
     bool IsAngled,
     clang::CharSourceRange FilenameRange,
-    const clang::FileEntry *File,
+    clang::OptionalFileEntryRef File,
     clang::StringRef SearchPath,
     clang::StringRef RelativePath,
     const clang::Module *Imported,
+    bool ModuleImported,
     clang::SrcMgr::CharacteristicKind FileType) override;
 
 private:
diff --git a/plugins/cpp/service/src/filediagram.cpp b/plugins/cpp/service/src/filediagram.cpp
index 44c3bf788..47d195c3a 100644
--- a/plugins/cpp/service/src/filediagram.cpp
+++ b/plugins/cpp/service/src/filediagram.cpp
@@ -711,7 +711,7 @@ util::Graph::Node FileDiagram::addNode(
   }
   else if (fileInfo_.type == "CPP")
   {
-    std::string ext = boost::filesystem::extension(fileInfo_.path);
+    std::string ext = boost::filesystem::path(fileInfo_.path).extension().string();
     std::transform(ext.begin(), ext.end(), ext.begin(), ::tolower);
 
     if (ext == ".cpp" || ext == ".cxx" || ext == ".cc"  || ext == ".c")
diff --git a/plugins/dummy/parser/src/dummyparser.cpp b/plugins/dummy/parser/src/dummyparser.cpp
index 9c3f2ff1e..1d8fa2346 100644
--- a/plugins/dummy/parser/src/dummyparser.cpp
+++ b/plugins/dummy/parser/src/dummyparser.cpp
@@ -17,7 +17,7 @@ DummyParser::DummyParser(ParserContext& ctx_): AbstractParser(ctx_)
 
 bool DummyParser::accept(const std::string& path_)
 {
-  std::string ext = boost::filesystem::extension(path_);
+  std::string ext = boost::filesystem::path(path_).string();
   return ext == ".dummy";
 }
 
diff --git a/plugins/git/parser/src/gitparser.cpp b/plugins/git/parser/src/gitparser.cpp
index 82c09edce..b33169cbe 100644
--- a/plugins/git/parser/src/gitparser.cpp
+++ b/plugins/git/parser/src/gitparser.cpp
@@ -164,7 +164,7 @@ util::DirIterCallback GitParser::getParserCallback()
       boost::property_tree::ptree pt;
       std::string repoFile(versionDataDir + "/repositories.txt");
 
-      if (boost::filesystem::is_regular(repoFile))
+      if (boost::filesystem::is_regular_file(repoFile))
         boost::property_tree::read_ini(repoFile, pt);
 
       pt.put(repoId + ".name", path.filename().string());
diff --git a/plugins/git/service/src/gitservice.cpp b/plugins/git/service/src/gitservice.cpp
index 88c8578fb..54f05f161 100644
--- a/plugins/git/service/src/gitservice.cpp
+++ b/plugins/git/service/src/gitservice.cpp
@@ -151,7 +151,7 @@ void GitServiceHandler::getRepositoryList(std::vector<GitRepository>& return_)
   std::string repoFile(versionDataDir.string() + "/repositories.txt");
   boost::property_tree::ptree pt;
 
-  if (!fs::is_regular(repoFile))
+  if (!fs::is_regular_file(repoFile))
   {
     LOG(warning) << "Repository file not found in data directory: " << repoFile;
     return;
diff --git a/plugins/search/parser/src/searchparser.cpp b/plugins/search/parser/src/searchparser.cpp
index 9306e04cd..cc5a97334 100644
--- a/plugins/search/parser/src/searchparser.cpp
+++ b/plugins/search/parser/src/searchparser.cpp
@@ -173,7 +173,7 @@ bool SearchParser::shouldHandle(const std::string& path_)
 {
   //--- The file is not regular. ---//
 
-  if (!fs::is_regular(path_))
+  if (!fs::is_regular_file(path_))
     return false;
 
   //--- The file is excluded by suffix. ---//
diff --git a/service/workspace/src/workspaceservice.cpp b/service/workspace/src/workspaceservice.cpp
index 1a88caa64..e395efd99 100644
--- a/service/workspace/src/workspaceservice.cpp
+++ b/service/workspace/src/workspaceservice.cpp
@@ -1,5 +1,6 @@
 #include <boost/filesystem.hpp>
 #include <workspaceservice/workspaceservice.h>
+#include <algorithm>
 
 namespace cc
 { 
diff --git a/util/include/util/hash.h b/util/include/util/hash.h
index f7f308ada..60ca2b718 100644
--- a/util/include/util/hash.h
+++ b/util/include/util/hash.h
@@ -36,18 +36,18 @@ inline std::string sha1Hash(const std::string& data_)
   using namespace boost::uuids::detail;
 
   sha1 hasher;
-  unsigned int digest[5];
+  unsigned char digest[20];
 
   hasher.process_bytes(data_.c_str(), data_.size());
   hasher.get_digest(digest);
 
   std::stringstream ss;
   ss.setf(std::ios::hex, std::ios::basefield);
-  ss.width(8);
+  ss.width(2);
   ss.fill('0');
 
-  for (int i = 0; i < 5; ++i)
-    ss << digest[i];
+  for (int i = 0; i < 20; ++i)
+    ss << (int)digest[i];
 
   return ss.str();
 }
diff --git a/webserver/include/webserver/pluginhandler.h b/webserver/include/webserver/pluginhandler.h
index 8d80ce543..84fd09686 100644
--- a/webserver/include/webserver/pluginhandler.h
+++ b/webserver/include/webserver/pluginhandler.h
@@ -44,7 +44,7 @@ class PluginHandler
     for (fs::directory_iterator dirIter(path_); dirIter != endIter; ++dirIter)
     {
       if (fs::is_regular_file(dirIter->status())
-        && fs::extension(*dirIter) == util::DynamicLibrary::extension())
+        && fs::path(*dirIter).extension() == util::DynamicLibrary::extension())
       {
         _dynamicLibraries.emplace_back(util::DynamicLibraryPtr(
           new util::DynamicLibrary(dirIter->path().string())));