diff --git a/go.mod b/go.mod
index 8d0f935d..8b66f470 100644
--- a/go.mod
+++ b/go.mod
@@ -64,3 +64,6 @@ require (
 // replace go.step.sm/crypto => ../crypto
 // replace go.step.sm/cli-utils => ../cli-utils
 // replace go.step.sm/linkedca => ../linkedca
+
+// use github.com/smallstep/pkcs7 fork with patches applied
+replace go.mozilla.org/pkcs7 => github.com/smallstep/pkcs7 v0.0.0-20211016004704-52592125d6f6
diff --git a/go.sum b/go.sum
index cad29555..4780111e 100644
--- a/go.sum
+++ b/go.sum
@@ -735,6 +735,8 @@ github.com/smallstep/assert v0.0.0-20200723003110-82e2b9b3b262 h1:unQFBIznI+VYD1
 github.com/smallstep/assert v0.0.0-20200723003110-82e2b9b3b262/go.mod h1:MyOHs9Po2fbM1LHej6sBUT8ozbxmMOFG+E+rx/GSGuc=
 github.com/smallstep/nosql v0.4.0 h1:Go3WYwttUuvwqMtFiiU4g7kBIlY+hR0bIZAqVdakQ3M=
 github.com/smallstep/nosql v0.4.0/go.mod h1:yKZT5h7cdIVm6wEKM9+jN5dgK80Hljpuy8HNsnI7Gzo=
+github.com/smallstep/pkcs7 v0.0.0-20211016004704-52592125d6f6 h1:8Rjy6IZbSM/jcYgBWCoLIGjug7QcoLtF9sUuhDrHD2U=
+github.com/smallstep/pkcs7 v0.0.0-20211016004704-52592125d6f6/go.mod h1:SNgMg+EgDFwmvSmLRTNKC5fegJjB7v23qTQ0XLGUNHk=
 github.com/smartystreets/assertions v0.0.0-20180927180507-b2de0cb4f26d/go.mod h1:OnSkiWE9lh6wB0YB77sQom3nweQdgAjqCqsofrRNTgc=
 github.com/smartystreets/goconvey v1.6.4/go.mod h1:syvi0/a8iFYH4r/RixwvyeAJjdLS9QV7WQ/tjFTllLA=
 github.com/soheilhy/cmux v0.1.4/go.mod h1:IM3LyeVVIOuxMH7sFAkER9+bJ4dT7Ms6E4xg4kGIyLM=
@@ -796,9 +798,6 @@ go.etcd.io/bbolt v1.3.5/go.mod h1:G5EMThwa9y8QZGBClrRx5EY+Yw9kAhnjy3bSjsnlVTQ=
 go.etcd.io/bbolt v1.3.6 h1:/ecaJf0sk1l4l6V4awd65v2C3ILy7MSj+s/x1ADCIMU=
 go.etcd.io/bbolt v1.3.6/go.mod h1:qXsaaIqmgQH0T+OPdb99Bf+PKfBBQVAdyD6TY9G8XM4=
 go.etcd.io/etcd v0.0.0-20191023171146-3cf2f69b5738/go.mod h1:dnLIgRNXwCJa5e+c6mIZCrds/GIG4ncV9HhK5PX7jPg=
-go.mozilla.org/pkcs7 v0.0.0-20210730143726-725912489c62/go.mod h1:SNgMg+EgDFwmvSmLRTNKC5fegJjB7v23qTQ0XLGUNHk=
-go.mozilla.org/pkcs7 v0.0.0-20210826202110-33d05740a352 h1:CCriYyAfq1Br1aIYettdHZTy8mBTIPo7We18TuO/bak=
-go.mozilla.org/pkcs7 v0.0.0-20210826202110-33d05740a352/go.mod h1:SNgMg+EgDFwmvSmLRTNKC5fegJjB7v23qTQ0XLGUNHk=
 go.opencensus.io v0.20.1/go.mod h1:6WKK9ahsWS3RSO+PY9ZHZUfv2irvY6gN279GOPZjmmk=
 go.opencensus.io v0.20.2/go.mod h1:6WKK9ahsWS3RSO+PY9ZHZUfv2irvY6gN279GOPZjmmk=
 go.opencensus.io v0.21.0/go.mod h1:mSImk1erAIZhrmZN+AvHh14ztQfjbGwt4TtuofqLduU=