diff --git a/core/bison/checksums b/core/bison/checksums
index 1fa90e76..05c5dd3d 100644
--- a/core/bison/checksums
+++ b/core/bison/checksums
@@ -1 +1 @@
-27159ac5ebf736dffd5636fd2cd625767c9e437de65baa63cb0de83570bd820d  bison-3.4.1.tar.xz
+27d05534699735dc69e86add5b808d6cb35900ad3fd63fa82e3eb644336abfa0  bison-3.4.2.tar.xz
diff --git a/core/bison/sources b/core/bison/sources
index b7ec9985..aad281b3 100644
--- a/core/bison/sources
+++ b/core/bison/sources
@@ -1 +1 @@
-https://ftp.gnu.org/gnu/bison/bison-3.4.1.tar.xz
+https://ftp.gnu.org/gnu/bison/bison-3.4.2.tar.xz
diff --git a/core/bison/version b/core/bison/version
index 0fb2806e..7675fd4a 100644
--- a/core/bison/version
+++ b/core/bison/version
@@ -1 +1 @@
-3.4.1 2
+3.4.2 1