diff --git a/CHANGES.md b/CHANGES.md
index 6058cce9..2dc17cdd 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,11 @@
 # CHANGES
 
+## 4.0.1
+
+* Fix warning [GH-475]
+
+  **@tompng**
+
 ## 4.0.0
 
 * `BigDecimal#divmod` return value changed to `[Integer, BigDecimal]` [GH-312]
diff --git a/ext/bigdecimal/bigdecimal.c b/ext/bigdecimal/bigdecimal.c
index c0581fd5..78449fbb 100644
--- a/ext/bigdecimal/bigdecimal.c
+++ b/ext/bigdecimal/bigdecimal.c
@@ -31,7 +31,7 @@
 #include "bits.h"
 #include "static_assert.h"
 
-#define BIGDECIMAL_VERSION "4.0.0"
+#define BIGDECIMAL_VERSION "4.0.1"
 
 /* #define ENABLE_NUMERIC_STRING */