diff --git a/CHANGELOG.md b/CHANGELOG.md
index e13c9d111..8da505c0f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,4 @@
-## [5.1.5] - 2024-04-??
+## [5.1.5] - 2024-04-05
 
 * asynchronous (_*non-blocking*_) fetching of WebGL GLSL shaders from the _*Content Delivery Network*_ (CDN) in the client-side JavaScript
 * further reduced the compressed size of the initial web page response down to 1.73kB by off-loading the GLSL shaders to the CDN
diff --git a/src/version.h b/src/version.h
index 9767e92cc..67664af47 100644
--- a/src/version.h
+++ b/src/version.h
@@ -2,7 +2,7 @@
 
 #define VERSION_MAJOR 5
 #define VERSION_MINOR 1
-#define VERSION_SUB 4
+#define VERSION_SUB 5
 
 #define STR_HELPER(x) #x
 #define STR(x) STR_HELPER(x)