diff --git a/.travis.yml b/.travis.yml
index 40e5b89..40f25c2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -30,3 +30,9 @@ matrix:
           language: cpp
           sudo: true
           script: docker build --build-arg TARGET_LLVM_VERSION=14 --build-arg BASE_IMAGE=ubuntu:22.04 --build-arg GCC_VERSION=9 --build-arg IMAGE_REPO=jammy .
+        - os: linux
+          dist: jammy
+          compiler: gcc
+          language: cpp
+          sudo: true
+          script: docker build --build-arg TARGET_LLVM_VERSION=15 --build-arg BASE_IMAGE=ubuntu:22.04 --build-arg GCC_VERSION=9 --build-arg IMAGE_REPO=jammy .
diff --git a/src/collectors/definitions.cpp b/src/collectors/definitions.cpp
index 250c753..a651e5f 100644
--- a/src/collectors/definitions.cpp
+++ b/src/collectors/definitions.cpp
@@ -25,11 +25,19 @@ class DefinitionsDataAppender : public MatchFinder::MatchCallback {
 
     clang::SourceManager *sm = r.SourceManager;
     const clang::FileID fid = sm->getFileID(e->getLocation());
+#if LLVM_VERSION_MAJOR >= 15
+    const llvm::Optional<clang::FileEntryRef> entry = sm->getFileEntryRefForID(fid);
+    if (!entry.has_value()) {
+      return;
+    }
+    const types::FileUID fuid = entry.value().getUID();
+#else
     const clang::FileEntry *entry = sm->getFileEntryForID(fid);
     if (!(entry && entry->isValid())) {
       return;
     }
     const types::FileUID fuid = entry->getUID();
+#endif
 
     data->defs.insert(
         std::pair<types::FileUID, const clang::NamedDecl *>(fuid, e));
diff --git a/src/collectors/include_graph/include_finder.cpp b/src/collectors/include_graph/include_finder.cpp
index 98ee85d..2717583 100644
--- a/src/collectors/include_graph/include_finder.cpp
+++ b/src/collectors/include_graph/include_finder.cpp
@@ -35,6 +35,8 @@
 #include <clang/Lex/Token.h>
 #include <clang/Tooling/Core/Replacement.h>
 #include <clang/Tooling/Tooling.h>
+
+#include <llvm/ADT/Optional.h>
 #include <llvm/ADT/StringRef.h>
 #include <llvm/Support/CommandLine.h>
 
@@ -53,15 +55,29 @@ using clangmetatool::types::MacroReferenceInfo;
 void IncludeFinder::InclusionDirective(
     clang::SourceLocation hashLoc, const clang::Token &includeToken,
     llvm::StringRef filename, bool isAngled,
+#if LLVM_VERSION_MAJOR >= 15
+    clang::CharSourceRange filenameRange, llvm::Optional<clang::FileEntryRef> file,
+#else
     clang::CharSourceRange filenameRange, const clang::FileEntry *file,
+#endif
     llvm::StringRef searchPath, llvm::StringRef relativePath,
     const clang::Module *imported,
     clang::SrcMgr::CharacteristicKind FileType_) {
+
   // The filetype characteristic is unused for now, hence marked with
   // a trailing '_'. We are recording all filetypes
+#if LLVM_VERSION_MAJOR >= 15
+  if(file.has_value()) {
+    add_include_statement(ci, data, hashLoc, includeToken, filename, isAngled,
+                          filenameRange, &file.value().getFileEntry(),
+                          searchPath, relativePath,
+                          imported);
+  }
+#else
   add_include_statement(ci, data, hashLoc, includeToken, filename, isAngled,
                         filenameRange, file, searchPath, relativePath,
                         imported);
+#endif
 }
 
 void IncludeFinder::MacroExpands(const clang::Token &macroUsage,
diff --git a/src/collectors/include_graph/include_finder.h b/src/collectors/include_graph/include_finder.h
index da9699d..2fd157d 100644
--- a/src/collectors/include_graph/include_finder.h
+++ b/src/collectors/include_graph/include_finder.h
@@ -35,7 +35,11 @@ class IncludeFinder : public clang::PPCallbacks {
   InclusionDirective(clang::SourceLocation hashLoc,
                      const clang::Token &includeToken, llvm::StringRef filename,
                      bool isAngled, clang::CharSourceRange filenameRange,
+#if LLVM_VERSION_MAJOR >= 15
+                     llvm::Optional<clang::FileEntryRef> File, llvm::StringRef SearchPath,
+#else
                      const clang::FileEntry *file, llvm::StringRef searchPath,
+#endif
                      llvm::StringRef relativePath,
                      const clang::Module *imported,
                      clang::SrcMgr::CharacteristicKind FileType_) override;
diff --git a/src/collectors/include_graph/include_graph_util.cpp b/src/collectors/include_graph/include_graph_util.cpp
index 937871c..a1159f2 100644
--- a/src/collectors/include_graph/include_graph_util.cpp
+++ b/src/collectors/include_graph/include_graph_util.cpp
@@ -58,7 +58,11 @@ static std::pair<FileUID, bool> get_fileuid(clang::CompilerInstance *ci,
 
   clang::SourceManager &sm = ci->getSourceManager();
   const clang::FileEntry *entry = sm.getFileEntryForID(fid);
+#if LLVM_VERSION_MAJOR >= 15
+  if (!entry)
+#else
   if (!(entry && entry->isValid()))
+#endif
     return std::pair<FileUID, bool>(0, false);
 
   FileUID fuid = entry->getUID();
@@ -101,7 +105,11 @@ void add_include_statement(clang::CompilerInstance *ci, IncludeGraphData *data,
                            const clang::Module *imported) {
 
   std::string include = (std::string)relativePath;
+#if LLVM_VERSION_MAJOR >= 15
+  if (file) {
+#else
   if (file && file->isValid()) {
+#endif
     FileUID fuid = file->getUID();
 
     data->fuid2entry.emplace(fuid, file);
diff --git a/src/tool_application_support.cpp b/src/tool_application_support.cpp
index 7a92ab0..57b4595 100644
--- a/src/tool_application_support.cpp
+++ b/src/tool_application_support.cpp
@@ -47,7 +47,11 @@ std::string getExecutablePathFromArgv(const std::string &argv0) {
     if (!llvm::sys::path::has_parent_path(exePath)) {
       llvm::Optional<std::string> maybeExePath =
           llvm::sys::Process::FindInEnvPath("PATH", argv0);
+#if LLVM_VERSION_MAJOR >= 15
+      exePath = maybeExePath.value_or("");
+#else
       exePath = maybeExePath.getValueOr("");
+#endif
     }
   }
   return !exePath.empty() ? getRealpath(exePath) : "";