diff --git a/doc/src/history.adoc b/doc/src/history.adoc
index 0463139f1..51780d83f 100644
--- a/doc/src/history.adoc
+++ b/doc/src/history.adoc
@@ -1,6 +1,15 @@
 [[b2.history]]
 = History
 
+== Version 4.9.1
+
+* Fix bad calculation of initial dev-only path to bootstrap file within the
+  b2 dev tree.
+  -- _René Ferdinand Rivera Morell_
+* Fix bad path calculation in final fallback for loading bootstrap file from
+  path specified in boost-build rule.
+  -- _René Ferdinand Rivera Morell_
+
 == Version 4.9.0
 
 This release has mostly internal cleanups and restructuring. The most
diff --git a/src/engine/patchlevel.h b/src/engine/patchlevel.h
index 240174947..27292bd70 100644
--- a/src/engine/patchlevel.h
+++ b/src/engine/patchlevel.h
@@ -13,4 +13,4 @@ Distributed under the Boost Software License, Version 1.0.
 
 #define VERSION_MAJOR 4
 #define VERSION_MINOR 9
-#define VERSION_PATCH 0
+#define VERSION_PATCH 1
diff --git a/src/engine/startup.cpp b/src/engine/startup.cpp
index 59e45d2eb..a3f20af6e 100644
--- a/src/engine/startup.cpp
+++ b/src/engine/startup.cpp
@@ -1,5 +1,5 @@
 /*
-Copyright 2020 René Ferdinand Rivera Morell
+Copyright 2020-2022 René Ferdinand Rivera Morell
 Distributed under the Boost Software License, Version 1.0.
 (See accompanying file LICENSE.txt or https://www.bfgroup.xyz/b2/LICENSE.txt)
 */
@@ -208,7 +208,7 @@ bool b2::startup::bootstrap(FRAME *frame)
     // development.
     if (bootstrap_file.empty())
     {
-        std::string work_dir(b2::paths::normalize(b2_exe_path + "/../"));
+        std::string work_dir(b2::paths::normalize(b2_exe_path + "/..") + "/");
         while (bootstrap_file.empty() && !work_dir.empty())
         {
             bootstrap_files_searched += "  " +  work_dir + "src/kernel/" + bootstrap_jam + "\n";
@@ -235,7 +235,7 @@ bool b2::startup::bootstrap(FRAME *frame)
         if (!dot_boost_build_dir.empty())
         {
             std::string dir = b2::jam::object(*dot_boost_build_dir.begin());
-            if (!b2_file_path.empty() && b2::paths::is_relative(dir))
+            if (!b2_file_path.empty() && !b2::paths::is_rooted(dir))
                 dir = b2_file_path + "/../" + dir;
             const std::string path
                 = b2::paths::normalize(dir + "/" + bootstrap_jam);