diff --git a/vendor/doctest b/vendor/doctest
index 53efdc5f..c1a47804 160000
--- a/vendor/doctest
+++ b/vendor/doctest
@@ -1 +1 @@
-Subproject commit 53efdc5f6ad44cc8488636ec250e0a9774261c90
+Subproject commit c1a47804f6f6426584f53d78e19ce9885a58aef1
diff --git a/vendor/valgrind b/vendor/valgrind
index d23bfcab..de0621ea 160000
--- a/vendor/valgrind
+++ b/vendor/valgrind
@@ -1 +1 @@
-Subproject commit d23bfcab7744276d2f39ce526f025205a58eeb50
+Subproject commit de0621ea61d32b621963b4aa89892c6f3b9bfdac
diff --git a/vendor/zlib b/vendor/zlib
index 623e780e..8c8b5126 160000
--- a/vendor/zlib
+++ b/vendor/zlib
@@ -1 +1 @@
-Subproject commit 623e780e1d3ffbeb4ca8b86f0eef2d523f5b001e
+Subproject commit 8c8b512655a9c46b5b08e2641191e8cacac50acb