diff --git a/.gitmodules b/.gitmodules
index c3709391..19b528e5 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,8 @@
+[submodule "vendor/boost-pfr"]
+    path = vendor/boost-pfr
+    url = https://github.com/upx/upx-vendor-boost-pfr.git
+    branch = upx-vendor
+    shallow = true
 [submodule "vendor/doctest"]
     path = vendor/doctest
     url = https://github.com/upx/upx-vendor-doctest.git
diff --git a/vendor/boost-pfr b/vendor/boost-pfr
new file mode 160000
index 00000000..11801c22
--- /dev/null
+++ b/vendor/boost-pfr
@@ -0,0 +1 @@
+Subproject commit 11801c222eeb5db96a222c1a3e57ade408b2ccf6
diff --git a/vendor/zlib b/vendor/zlib
index 2a5b338e..11c0505f 160000
--- a/vendor/zlib
+++ b/vendor/zlib
@@ -1 +1 @@
-Subproject commit 2a5b338eb173a701ed179e951d4c390e75e8d4c7
+Subproject commit 11c0505fd26300b53bc7272078dc173130ee0efe