diff --git a/.gitignore b/.gitignore
index 6ef73fe..df68362 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 /frozenlist-1.3.0.tar.gz
 /frozenlist-1.3.1.tar.gz
 /frozenlist-1.3.3.tar.gz
+/frozenlist-1.4.0.tar.gz
diff --git a/python-frozenlist.spec b/python-frozenlist.spec
index 9bac61c..6044392 100644
--- a/python-frozenlist.spec
+++ b/python-frozenlist.spec
@@ -5,7 +5,7 @@
 %bcond doc 1
 
 Name:           python-frozenlist
-Version:        1.3.3
+Version:        1.4.0
 Release:        %autorelease
 Summary:        List-like structure which can be made immutable
 
diff --git a/sources b/sources
index b048123..b1701fc 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (frozenlist-1.3.3.tar.gz) = a92c6c0b60eaa66db6f26cef9b3991ab207bb38c5686b66194f61e168f1a1d98d1966d7fe7c800191bb3d2eae8c2dc014819091c78f2bb24e53dc257bba0ed51
+SHA512 (frozenlist-1.4.0.tar.gz) = 2b5ff165250d1d2e95f987f95084f46a0adb85e09d4f413435ef4bd50d2717f74096afc678b2c23528d8f1af68638145d5414f36a735299a57bae7ff8e87c18d