diff --git a/m4/default-hash-algo.m4 b/m4/default-hash-algo.m4
index b6164a5..92390fd 100644
--- a/m4/default-hash-algo.m4
+++ b/m4/default-hash-algo.m4
@@ -9,7 +9,7 @@ AC_DEFUN([AX_DEFAULT_HASH_ALGO], [
 	AC_ARG_WITH([default_hash],
 		AS_HELP_STRING([--with-default-hash=ALGORITHM], [specifies the default hash algorithm to be used]),
 		[HASH_ALGO=$withval],
-		[HASH_ALGO=sha1])
+		[HASH_ALGO=sha256])
 
 	AC_PROG_SED()
 	HASH_ALGO="$(echo $HASH_ALGO | $SED 's/\(.*\)/\L\1\E/')"
diff --git a/src/imaevm.h b/src/imaevm.h
index ec8551f..0d53a02 100644
--- a/src/imaevm.h
+++ b/src/imaevm.h
@@ -76,7 +76,7 @@
 #define log_errno(fmt, args...)		do_log(LOG_ERR, fmt ": errno: %s (%d)\n", ##args, strerror(errno), errno)
 
 #ifndef DEFAULT_HASH_ALGO
-#define DEFAULT_HASH_ALGO "sha1"
+#define DEFAULT_HASH_ALGO "sha256"
 #endif
 
 #define	DATA_SIZE	4096