diff --git a/carray.gemspec b/carray.gemspec
index 3f26153..2873491 100644
--- a/carray.gemspec
+++ b/carray.gemspec
@@ -1,6 +1,6 @@
 Gem::Specification::new do |s|
 
-  version = "1.5.6"
+  version = "1.5.7"
 
   files = Dir.glob("**/*") + [".yardopts"] -
                              [ 
diff --git a/ext/version.h b/ext/version.h
index 456d393..09b16d1 100644
--- a/ext/version.h
+++ b/ext/version.h
@@ -8,9 +8,9 @@
 
 ---------------------------------------------------------------------------- */
 
-#define CA_VERSION "1.5.6"
-#define CA_VERSION_CODE 156
+#define CA_VERSION "1.5.7"
+#define CA_VERSION_CODE 157
 #define CA_VERSION_MAJOR 1
 #define CA_VERSION_MINOR 5
-#define CA_VERSION_TEENY 6
-#define CA_VERSION_DATE "2021/02/25"
+#define CA_VERSION_TEENY 7
+#define CA_VERSION_DATE "2021/06/16"