diff --git a/vendor/doctest b/vendor/doctest
index c1a47804..dfa6d0e4 160000
--- a/vendor/doctest
+++ b/vendor/doctest
@@ -1 +1 @@
-Subproject commit c1a47804f6f6426584f53d78e19ce9885a58aef1
+Subproject commit dfa6d0e4014c45b5f94261531d12c4629b82e41f
diff --git a/vendor/valgrind b/vendor/valgrind
index de0621ea..5a703781 160000
--- a/vendor/valgrind
+++ b/vendor/valgrind
@@ -1 +1 @@
-Subproject commit de0621ea61d32b621963b4aa89892c6f3b9bfdac
+Subproject commit 5a7037818b97dc50af556e5850cb1f768824d86f
diff --git a/vendor/zlib b/vendor/zlib
index 8c8b5126..d5a1e143 160000
--- a/vendor/zlib
+++ b/vendor/zlib
@@ -1 +1 @@
-Subproject commit 8c8b512655a9c46b5b08e2641191e8cacac50acb
+Subproject commit d5a1e143b13973d3289595bbafdfe3168eb0ecd3