diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1d2bcd4..cdd2b76 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## unreleased
 
+## 1.13.3 - 2023-03-11
+
+### Fixed
+
+ - Fix the `DOWNLOAD_EXTRACT_TIMESTAMP` CMake warning (see [datatype99/issues/15](https://github.com/Hirrolot/datatype99/issues/15)).
+
 ## 1.13.2 - 2022-05-15
 
 ### Fixed
diff --git a/Doxyfile b/Doxyfile
index f9c08c9..9776bdd 100644
--- a/Doxyfile
+++ b/Doxyfile
@@ -38,7 +38,7 @@ PROJECT_NAME           = "Metalang99"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 1.13.2
+PROJECT_NUMBER         = 1.13.3
 
 # 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/docs/conf.py b/docs/conf.py
index 4e36973..a4621ba 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -25,7 +25,7 @@
 author = 'Hirrolot'
 
 # The full version, including alpha/beta/rc tags
-release = '1.13.2'
+release = '1.13.3'
 
 
 # -- General configuration ---------------------------------------------------
diff --git a/include/metalang99.h b/include/metalang99.h
index f437f8f..643f8bb 100644
--- a/include/metalang99.h
+++ b/include/metalang99.h
@@ -23,7 +23,7 @@
 
 #define ML99_MAJOR 1
 #define ML99_MINOR 13
-#define ML99_PATCH 2
+#define ML99_PATCH 3
 
 #define ML99_VERSION_COMPATIBLE(x, y, z)                                                           \
     (ML99_MAJOR == (x) && ((ML99_MINOR == (y) && ML99_PATCH >= (z)) || (ML99_MINOR > (y))))
diff --git a/spec/spec.pdf b/spec/spec.pdf
index 6e77a8d..1918bd0 100644
Binary files a/spec/spec.pdf and b/spec/spec.pdf differ
diff --git a/spec/spec.tex b/spec/spec.tex
index b0ee359..9287c70 100644
--- a/spec/spec.tex
+++ b/spec/spec.tex
@@ -24,7 +24,7 @@
 
 \begin{document}
 
-\title{Metalang99 Specification (v1.13.2)}
+\title{Metalang99 Specification (v1.13.3)}
 \date{\today}
 \author{Hirrolot \\ e-mail: \href{mailto:hirrolot@gmail.com}{hirrolot@gmail.com}}
 \maketitle