diff --git a/contrib/gitian-descriptors/gitian-linux.yml b/contrib/gitian-descriptors/gitian-linux.yml
index db144b234..ec34cc551 100644
--- a/contrib/gitian-descriptors/gitian-linux.yml
+++ b/contrib/gitian-descriptors/gitian-linux.yml
@@ -15,6 +15,8 @@ packages:
 - "faketime"
 - "bsdmainutils"
 - "binutils-gold"
+- "ca-certificates"
+- "python"
 reference_datetime: "2016-01-01 00:00:00"
 remotes:
 - "url": "https://github.com/bitcoin/bitcoin.git"
diff --git a/contrib/gitian-descriptors/gitian-osx.yml b/contrib/gitian-descriptors/gitian-osx.yml
index f9879c261..664ca9dfe 100644
--- a/contrib/gitian-descriptors/gitian-osx.yml
+++ b/contrib/gitian-descriptors/gitian-osx.yml
@@ -18,6 +18,8 @@ packages:
 - "libcap-dev"
 - "libz-dev"
 - "libbz2-dev"
+- "ca-certificates"
+- "python"
 reference_datetime: "2016-01-01 00:00:00"
 remotes:
 - "url": "https://github.com/bitcoin/bitcoin.git"
diff --git a/contrib/gitian-descriptors/gitian-win.yml b/contrib/gitian-descriptors/gitian-win.yml
index 4d9acb10a..72ff095b9 100644
--- a/contrib/gitian-descriptors/gitian-win.yml
+++ b/contrib/gitian-descriptors/gitian-win.yml
@@ -18,6 +18,8 @@ packages:
 - "g++-mingw-w64"
 - "nsis"
 - "zip"
+- "ca-certificates"
+- "python"
 reference_datetime: "2016-01-01 00:00:00"
 remotes:
 - "url": "https://github.com/bitcoin/bitcoin.git"