diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6b9b8900a2..f39220522d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -26,7 +26,7 @@ set(CMAKE_CXX_STANDARD 14)
 set(WRENCH_VERSION_MAJOR "1")
 set(WRENCH_VERSION_MINOR "9")
 set(WRENCH_VERSION_PATCH "0")
-set(WRENCH_VERSION_EXTRA "dev")
+set(WRENCH_VERSION_EXTRA "")
 
 if (${WRENCH_VERSION_PATCH} EQUAL "0")
     set(WRENCH_RELEASE_VERSION "${WRENCH_VERSION_MAJOR}.${WRENCH_VERSION_MINOR}")
diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index 204a2bfa40..4d12427759 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -1,6 +1,18 @@
 WRENCH Release Notes
 ------
 
+### WRENCH 1.9
+
+(August 24, 2021) This release includes a series of **new features**, **enhancements**, and **bug fixes**, including:
+
+- Performance improvement ([#221](https://github.com/wrench-project/wrench/issues/221))
+- Updates to HTCondor component and API ([#220](https://github.com/wrench-project/wrench/issues/220))
+- Enhancement ([#225](https://github.com/wrench-project/wrench/issues/225))
+
+**Note**: WRENCH 1.9 requires [SimGrid 3.27](https://simgrid.org)
+
+---
+
 ### WRENCH 1.8
 
 (February 18, 2021) This release includes a series of **new features**, **enhancements**, and **bug fixes**, including:
diff --git a/include/wrench/simulation/Version.h b/include/wrench/simulation/Version.h
index 901b53594c..d2e20c45b1 100644
--- a/include/wrench/simulation/Version.h
+++ b/include/wrench/simulation/Version.h
@@ -9,5 +9,5 @@
  */
 
 namespace wrench {
-  #define WRENCH_VERSION_STRING "1.9-dev"
+  #define WRENCH_VERSION_STRING "1.9"
 }