diff --git a/.abf.yml b/.abf.yml
index 1d3921b..8ebf7c5 100644
--- a/.abf.yml
+++ b/.abf.yml
@@ -1,2 +1,2 @@
 sources:
-  ngtcp2-1.9.0.tar.gz: acbdab8c712ac0d725e0490be84e8cb238e49f3a
+  ngtcp2-1.9.1.tar.gz: eac3596194502c283fb0c915021fd6cf5a7cedbc
diff --git a/ngtcp2.spec b/ngtcp2.spec
index 150dbc6..d8adb4e 100644
--- a/ngtcp2.spec
+++ b/ngtcp2.spec
@@ -13,7 +13,7 @@
 %define 	secscan 0
 
 Name:		ngtcp2
-Version:	1.9.0
+Version:	1.9.1
 Release:	1
 Summary:	ngtcp2 project is an effort to implement IETF QUIC protocol
 License:	MIT