diff --git a/src/case.c b/src/case.c
index 14a5e9aa..9ab0223a 100644
--- a/src/case.c
+++ b/src/case.c
@@ -26,7 +26,7 @@
 
 #include <stddef.h>
 
-/* Unicode Character Data 9.0.0 */
+/* Unicode Character Data 10.0.0 */
 
 struct case_conversion_entry
 {
diff --git a/src/categories.c b/src/categories.c
index 4eade2eb..66311df9 100644
--- a/src/categories.c
+++ b/src/categories.c
@@ -58,7 +58,7 @@
 #define Zs UCD_CATEGORY_Zs
 #define Ii UCD_CATEGORY_Ii
 
-/* Unicode Character Data 9.0.0 */
+/* Unicode Character Data 10.0.0 */
 
 static const uint8_t categories_Cn[256] =
 {
diff --git a/src/scripts.c b/src/scripts.c
index ae1a4893..573c137a 100644
--- a/src/scripts.c
+++ b/src/scripts.c
@@ -203,7 +203,7 @@
 #define Zyyy UCD_SCRIPT_Zyyy
 #define Zzzz UCD_SCRIPT_Zzzz
 
-/* Unicode Character Data 9.0.0 */
+/* Unicode Character Data 10.0.0 */
 
 static const uint8_t scripts_Latn[256] =
 {