diff --git a/packages/upstream/angstrom.0.16.0/opam b/packages/upstream/angstrom.0.16.1/opam
similarity index 78%
rename from packages/upstream/angstrom.0.16.0/opam
rename to packages/upstream/angstrom.0.16.1/opam
index b54870c0..45a52452 100644
--- a/packages/upstream/angstrom.0.16.0/opam
+++ b/packages/upstream/angstrom.0.16.1/opam
@@ -1,20 +1,15 @@
 opam-version: "2.0"
-name: "angstrom"
-version: "0.16.0"
-synopsis: "Parser combinators built for speed and memory-efficiency"
-description: """\
-Angstrom is a parser-combinator library that makes it easy to write efficient,
-expressive, and reusable parsers suitable for high-performance applications. It
-exposes monadic and applicative interfaces for composition, and supports
-incremental input through buffered and unbuffered interfaces. Both interfaces
-give the user total control over the blocking behavior of their application,
-with the unbuffered interface enabling zero-copy IO. Parsers are backtracking by
-default and support unbounded lookahead."""
 maintainer: "Spiros Eliopoulos <spiros@inhabitedtype.com>"
-authors: "Spiros Eliopoulos <spiros@inhabitedtype.com>"
-license: "BSD-3-Clause"
+authors: [ "Spiros Eliopoulos <spiros@inhabitedtype.com>" ]
+license: "BSD-3-clause"
 homepage: "https://github.com/inhabitedtype/angstrom"
 bug-reports: "https://github.com/inhabitedtype/angstrom/issues"
+dev-repo: "git+https://github.com/inhabitedtype/angstrom.git"
+build: [
+  ["dune" "subst"] {dev}
+  ["dune" "build" "-p" name "-j" jobs]
+  ["dune" "runtest" "-p" name "-j" jobs] {with-test}
+]
 depends: [
   "ocaml" {>= "4.04.0"}
   "dune" {>= "1.8"}
@@ -23,16 +18,19 @@ depends: [
   "ppx_let" {with-test & >= "v0.14.0"}
   "ocaml-syntax-shims" {build}
 ]
-build: [
-  ["dune" "subst"] {dev}
-  ["dune" "build" "-p" name "-j" jobs]
-  ["dune" "runtest" "-p" name "-j" jobs] {with-test}
-]
-dev-repo: "git+https://github.com/inhabitedtype/angstrom.git"
+synopsis: "Parser combinators built for speed and memory-efficiency"
+description: """
+Angstrom is a parser-combinator library that makes it easy to write efficient,
+expressive, and reusable parsers suitable for high-performance applications. It
+exposes monadic and applicative interfaces for composition, and supports
+incremental input through buffered and unbuffered interfaces. Both interfaces
+give the user total control over the blocking behavior of their application,
+with the unbuffered interface enabling zero-copy IO. Parsers are backtracking by
+default and support unbounded lookahead."""
 url {
-  src: "https://github.com/inhabitedtype/angstrom/archive/0.16.0.tar.gz"
+  src: "https://github.com/inhabitedtype/angstrom/archive/0.16.1.tar.gz"
   checksum: [
-    "sha256=47810bd31306d57c0ac83eb3f95b1cb6f8bdda99457aa6e6bcd02f6ddb8410f0"
-    "md5=58ebc718a920c31ec3eb38f4aa1bea51"
+    "md5=a9e096b4b2b8e4e3bb17d472bbccaad0"
+    "sha256=143536fb4d049574c539b9990840615e078ed3dd94e1d24888293f68349a100b"
   ]
 }