diff --git a/.gitignore b/.gitignore
index 3851718..543812d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,4 @@
 /blaze-builder-0.3.3.4.tar.gz
 /blaze-builder-0.4.0.2.tar.gz
 /blaze-builder-0.4.1.0.tar.gz
+/blaze-builder-0.4.2.1.tar.gz
diff --git a/ghc-blaze-builder.spec b/ghc-blaze-builder.spec
index be5f7b2..85511c4 100644
--- a/ghc-blaze-builder.spec
+++ b/ghc-blaze-builder.spec
@@ -7,8 +7,8 @@
 # testsuite missing deps: test-framework test-framework-hunit test-framework-quickcheck2
 
 Name:           ghc-%{pkg_name}
-Version:        0.4.1.0
-Release:        10%{?dist}
+Version:        0.4.2.1
+Release:        1%{?dist}
 Summary:        Efficient buffered output
 
 License:        BSD
@@ -114,6 +114,9 @@ This package provides the Haskell %{pkg_name} profiling library.
 
 
 %changelog
+* Thu Aug  5 2021 Jens Petersen <petersen@redhat.com> - 0.4.2.1-1
+- update to 0.4.2.1
+
 * Thu Jul 22 2021 Fedora Release Engineering <releng@fedoraproject.org> - 0.4.1.0-10
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_35_Mass_Rebuild
 
diff --git a/sources b/sources
index fffa535..15ba1dd 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (blaze-builder-0.4.1.0.tar.gz) = 0962634113a19d39fb19a9df895a4e4e3e0fc5b2c17fd0d5c27e1cd9da128fd3af2f01d7b0ce894d3964b5b3bd874aeae205b126e069a6e5d964ad97c753da39
+SHA512 (blaze-builder-0.4.2.1.tar.gz) = 30f8d1d70a1aeb5b4c4e3170e40207c0f39933050e04bbdff49683a8b2e850921e80fa8e2d7f2b7a2a19fd6340bb65fad9c1d33999abf8a388d3f0ce921d0744