diff --git a/core/bison/checksums b/core/bison/checksums
index 05c5dd3d..15dc79bb 100644
--- a/core/bison/checksums
+++ b/core/bison/checksums
@@ -1 +1 @@
-27d05534699735dc69e86add5b808d6cb35900ad3fd63fa82e3eb644336abfa0  bison-3.4.2.tar.xz
+55e4a023b1b4ad19095a5f8279f0dc048fa29f970759cea83224a6d5e7a3a641  bison-3.5.tar.xz
diff --git a/core/bison/sources b/core/bison/sources
index aad281b3..0b8702d5 100644
--- a/core/bison/sources
+++ b/core/bison/sources
@@ -1 +1 @@
-https://ftp.gnu.org/gnu/bison/bison-3.4.2.tar.xz
+https://ftp.gnu.org/gnu/bison/bison-3.5.tar.xz
diff --git a/core/bison/version b/core/bison/version
index 7675fd4a..61e3d241 100644
--- a/core/bison/version
+++ b/core/bison/version
@@ -1 +1 @@
-3.4.2 1
+3.5 1