diff --git a/GNUmakefile b/GNUmakefile
index 7e8cdcd..975fdc6 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -15,7 +15,7 @@
 # along with Libzt.  If not, see <https://www.gnu.org/licenses/>.
 
 NAME = libzt
-VERSION = 0.3
+VERSION = 0.3.1
 
 srcdir ?= .
 # Include optional generated makefile from the configuration system.
diff --git a/NEWS b/NEWS
index 8561be4..f342605 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,8 @@
+Changes in 0.3.1:
+
+ * The build system has been updated to ZMK 0.3.5. This should fix
+   current build issues encountered in Debian.
+
 Changes in 0.3:
 
  * Pointers captured in zt_value by zt_pack_pointer() are now constant.
diff --git a/zt-test.c b/zt-test.c
index e5ce967..db823db 100644
--- a/zt-test.c
+++ b/zt-test.c
@@ -202,7 +202,7 @@ static void selftest_stream_eq_at(FILE* stream, const char* file,
 static void test_MAJOR_MINOR_VERSION(void)
 {
     assert(ZT_MAJOR_VERSION == 0);
-    assert(ZT_MINOR_VERSION == 1);
+    assert(ZT_MINOR_VERSION == 3);
 }
 
 /* packing arguments */
diff --git a/zt.h b/zt.h
index b7a99b6..bc6f205 100644
--- a/zt.h
+++ b/zt.h
@@ -26,7 +26,7 @@ extern "C" {
 #include <stdlib.h>
 
 #define ZT_MAJOR_VERSION 0
-#define ZT_MINOR_VERSION 1
+#define ZT_MINOR_VERSION 3
 
 struct zt_test;
 typedef struct zt_test* zt_t;