diff --git a/io.c b/io.c
index f14080e21ef93d..94facda8e7802b 100644
--- a/io.c
+++ b/io.c
@@ -2935,6 +2935,7 @@ io_write_nonblock(VALUE io, VALUE str, VALUE ex)
 
     rb_io_set_nonblock(fptr);
     n = write(fptr->fd, RSTRING_PTR(str), RSTRING_LEN(str));
+    RB_GC_GUARD(str);
 
     if (n == -1) {
 	int e = errno;
diff --git a/version.h b/version.h
index 4bfecb36711672..b0a0ccb9b901cc 100644
--- a/version.h
+++ b/version.h
@@ -1,10 +1,10 @@
 #define RUBY_VERSION "2.5.4"
-#define RUBY_RELEASE_DATE "2019-01-17"
-#define RUBY_PATCHLEVEL 131
+#define RUBY_RELEASE_DATE "2019-01-20"
+#define RUBY_PATCHLEVEL 132
 
 #define RUBY_RELEASE_YEAR 2019
 #define RUBY_RELEASE_MONTH 1
-#define RUBY_RELEASE_DAY 17
+#define RUBY_RELEASE_DAY 20
 
 #include "ruby/version.h"