diff --git a/CMakeLists.txt b/CMakeLists.txt
index 61900de49..d256a4240 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,10 +3,10 @@ cmake_minimum_required(VERSION 3.16)
 project(ada
   DESCRIPTION "Fast spec-compliant URL parser"
   LANGUAGES C CXX
-  VERSION 2.9.0
+  VERSION 2.9.1
 )
 set(CMAKE_CXX_STANDARD 17)
-set(ADA_LIB_VERSION "2.9.0" CACHE STRING "ada library version")
+set(ADA_LIB_VERSION "2.9.1" CACHE STRING "ada library version")
 set(ADA_LIB_SOVERSION "2" CACHE STRING "ada library soversion")
 
 include(GNUInstallDirs)
diff --git a/doxygen b/doxygen
index 527c6cf59..651d11756 100644
--- a/doxygen
+++ b/doxygen
@@ -48,7 +48,7 @@ PROJECT_NAME           = "Ada"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = "2.9.0"
+PROJECT_NUMBER         = "2.9.1"
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a
diff --git a/include/ada/ada_version.h b/include/ada/ada_version.h
index eebcab508..512e0fdfa 100644
--- a/include/ada/ada_version.h
+++ b/include/ada/ada_version.h
@@ -5,14 +5,14 @@
 #ifndef ADA_ADA_VERSION_H
 #define ADA_ADA_VERSION_H
 
-#define ADA_VERSION "2.9.0"
+#define ADA_VERSION "2.9.1"
 
 namespace ada {
 
 enum {
   ADA_VERSION_MAJOR = 2,
   ADA_VERSION_MINOR = 9,
-  ADA_VERSION_REVISION = 0,
+  ADA_VERSION_REVISION = 1,
 };
 
 }  // namespace ada