diff --git a/nixos/modules/services/monitoring/prometheus/default.nix b/nixos/modules/services/monitoring/prometheus/default.nix
index 9103a6f932d..bd74e1a9cdb 100644
--- a/nixos/modules/services/monitoring/prometheus/default.nix
+++ b/nixos/modules/services/monitoring/prometheus/default.nix
@@ -468,7 +468,7 @@ let
         '';
       };
 
-      value = mkOption {
+      values = mkOption {
         type = types.listOf types.str;
         default = [];
         description = ''
diff --git a/nixos/tests/all-tests.nix b/nixos/tests/all-tests.nix
index 5ea7a5c0f05..773f91d8604 100644
--- a/nixos/tests/all-tests.nix
+++ b/nixos/tests/all-tests.nix
@@ -240,6 +240,7 @@ in
   mosquitto = handleTest ./mosquitto.nix {};
   mpd = handleTest ./mpd.nix {};
   mumble = handleTest ./mumble.nix {};
+  musescore = handleTest ./musescore.nix {};
   munin = handleTest ./munin.nix {};
   mutableUsers = handleTest ./mutable-users.nix {};
   mxisd = handleTest ./mxisd.nix {};
diff --git a/nixos/tests/musescore.nix b/nixos/tests/musescore.nix
new file mode 100644
index 00000000000..96481a9a8bf
--- /dev/null
+++ b/nixos/tests/musescore.nix
@@ -0,0 +1,86 @@
+import ./make-test-python.nix ({ pkgs, ...} :
+
+let
+  # Make sure we don't have to go through the startup tutorial
+  customMuseScoreConfig = pkgs.writeText "MuseScore3.ini" ''
+    [application]
+    startup\firstStart=false
+
+    [ui]
+    application\startup\showTours=false
+    application\startup\showStartCenter=false
+    '';
+in
+{
+  name = "musescore";
+  meta = with pkgs.lib.maintainers; {
+    maintainers = [ turion ];
+  };
+
+  machine = { ... }:
+
+  {
+    imports = [
+      ./common/x11.nix
+    ];
+
+    services.xserver.enable = true;
+    environment.systemPackages = with pkgs; [
+      musescore
+      pdfgrep
+    ];
+  };
+
+  enableOCR = true;
+
+  testScript = { ... }: ''
+    start_all()
+    machine.wait_for_x()
+
+    # Inject custom settings
+    machine.succeed("mkdir -p /root/.config/MuseScore/")
+    machine.succeed(
+        "cp ${customMuseScoreConfig} /root/.config/MuseScore/MuseScore3.ini"
+    )
+
+    # Start MuseScore window
+    machine.execute("DISPLAY=:0.0 mscore &")
+
+    # Wait until MuseScore has launched
+    machine.wait_for_window("MuseScore")
+
+    # Wait until the window has completely initialised
+    machine.wait_for_text("MuseScore")
+
+    # Start entering notes
+    machine.send_key("n")
+    # Type the beginning of https://de.wikipedia.org/wiki/Alle_meine_Entchen
+    machine.send_chars("cdef6gg5aaaa7g")
+    # Make sure the VM catches up with all the keys
+    machine.sleep(1)
+
+    machine.screenshot("MuseScore0")
+
+    # Go to the export dialogue and create a PDF
+    machine.send_key("alt-f")
+    machine.sleep(1)
+    machine.send_key("e")
+
+    # Wait until the export dialogue appears.
+    machine.wait_for_window("Export")
+    machine.screenshot("MuseScore1")
+    machine.send_key("ret")
+    machine.sleep(1)
+    machine.send_key("ret")
+
+    machine.screenshot("MuseScore2")
+
+    # Wait until PDF is exported
+    machine.wait_for_file("/root/Documents/MuseScore3/Scores/Untitled.pdf")
+
+    # Check that it contains the title of the score
+    machine.succeed("pdfgrep Title /root/Documents/MuseScore3/Scores/Untitled.pdf")
+
+    machine.screenshot("MuseScore3")
+  '';
+})
diff --git a/pkgs/applications/audio/musescore/default.nix b/pkgs/applications/audio/musescore/default.nix
index 47f8e5a22e6..0c1ad144a4a 100644
--- a/pkgs/applications/audio/musescore/default.nix
+++ b/pkgs/applications/audio/musescore/default.nix
@@ -3,6 +3,7 @@
 , portaudio, portmidi, qtbase, qtdeclarative, qtgraphicaleffects
 , qtquickcontrols2, qtscript, qtsvg, qttools
 , qtwebengine, qtxmlpatterns
+, nixosTests
 }:
 
 mkDerivation rec {
@@ -40,6 +41,8 @@ mkDerivation rec {
     qtscript qtsvg qttools qtwebengine qtxmlpatterns
   ];
 
+  passthru.tests = nixosTests.musescore;
+
   meta = with lib; {
     description = "Music notation and composition software";
     homepage = "https://musescore.org/";
diff --git a/pkgs/applications/misc/klayout/default.nix b/pkgs/applications/misc/klayout/default.nix
index 60905be3b1b..33f3c4144b5 100644
--- a/pkgs/applications/misc/klayout/default.nix
+++ b/pkgs/applications/misc/klayout/default.nix
@@ -5,13 +5,13 @@
 
 mkDerivation rec {
   pname = "klayout";
-  version = "0.26.8";
+  version = "0.26.9";
 
   src = fetchFromGitHub {
     owner = "KLayout";
     repo = "klayout";
     rev = "v${version}";
-    sha256 = "0pkhvxcfk70dnmgczyyq585mxrfwqai44ikshs4c1imh92z25llq";
+    sha256 = "sha256-d0k8OQZ+ij+dslc3iAQkgy1TyYAL7Bf1xvSH21eTGO8=";
   };
 
   postPatch = ''
diff --git a/pkgs/applications/science/chemistry/jmol/default.nix b/pkgs/applications/science/chemistry/jmol/default.nix
index aa52fee0890..32e7e7e5d72 100644
--- a/pkgs/applications/science/chemistry/jmol/default.nix
+++ b/pkgs/applications/science/chemistry/jmol/default.nix
@@ -17,14 +17,14 @@ let
   };
 in
 stdenv.mkDerivation rec {
-  version = "14.31.18";
+  version = "14.31.24";
   pname = "jmol";
 
   src = let
     baseVersion = "${lib.versions.major version}.${lib.versions.minor version}";
   in fetchurl {
     url = "mirror://sourceforge/jmol/Jmol/Version%20${baseVersion}/Jmol%20${version}/Jmol-${version}-binary.tar.gz";
-    sha256 = "0hkc7c08azbw3k91ygwz6r5y4yw6k8l7h4gcq5p71knd5k1fa5jd";
+    sha256 = "sha256-86nDeKRXSNKrmYeo1rRLfziLVnmEmdIJRfIv6DFIxcs=";
   };
 
   patchPhase = ''
diff --git a/pkgs/development/interpreters/jruby/default.nix b/pkgs/development/interpreters/jruby/default.nix
index fb1fdd3c8e0..4d8771b93eb 100644
--- a/pkgs/development/interpreters/jruby/default.nix
+++ b/pkgs/development/interpreters/jruby/default.nix
@@ -6,11 +6,11 @@ rubyVersion = callPackage ../ruby/ruby-version.nix {} "2" "5" "7" "";
 jruby = stdenv.mkDerivation rec {
   pname = "jruby";
 
-  version = "9.2.14.0";
+  version = "9.2.15.0";
 
   src = fetchurl {
     url = "https://s3.amazonaws.com/jruby.org/downloads/${version}/jruby-bin-${version}.tar.gz";
-    sha256 = "1dg0fz9b8m1k0sypvpxnf4xjqwc0pyy35xw4rsg4a7pha4jkprrj";
+    sha256 = "sha256-no5dc8QtHa2KeVptw5vYfoj8iGP3bgZeQJnDLQhSBbA=";
   };
 
   nativeBuildInputs = [ makeWrapper ];
diff --git a/pkgs/tools/networking/webwormhole/default.nix b/pkgs/tools/networking/webwormhole/default.nix
new file mode 100644
index 00000000000..8fbaf3159a2
--- /dev/null
+++ b/pkgs/tools/networking/webwormhole/default.nix
@@ -0,0 +1,22 @@
+{ lib, buildGoModule, fetchFromGitHub }:
+
+buildGoModule rec {
+  pname = "webwormhole";
+  version = "unstable-2021-01-16";
+
+  src = fetchFromGitHub {
+    owner = "saljam";
+    repo = pname;
+    rev = "c85e196c8a8a885815136aa8aee1958ad80a3bb5";
+    sha256 = "D10xmBwmEbeR3nU4CmppFBzdeE4Pm2+o/Vb5Yd+pPtM=";
+  };
+
+  vendorSha256 = "sha256-yK04gjDO6JSDcJULcbJBBuPBhx792JNn+B227lDUrWk=";
+
+  meta = with lib; {
+    description = "Send files using peer authenticated WebRTC";
+    homepage = "https://github.com/saljam/webwormhole";
+    license = licenses.bsd3;
+    maintainers = with maintainers; [ bbigras ];
+  };
+}
diff --git a/pkgs/tools/package-management/opkg/default.nix b/pkgs/tools/package-management/opkg/default.nix
index c4fc804b80f..7f06cbbd3c2 100644
--- a/pkgs/tools/package-management/opkg/default.nix
+++ b/pkgs/tools/package-management/opkg/default.nix
@@ -2,11 +2,11 @@
 , autoreconfHook }:
 
 stdenv.mkDerivation rec {
-  version = "0.4.3";
+  version = "0.4.4";
   pname = "opkg";
   src = fetchurl {
     url = "https://downloads.yoctoproject.org/releases/opkg/opkg-${version}.tar.gz";
-    sha256 = "06278gmb26b9nl8l328cc2c2mhfi0dhac65syws17kf09f2m596x";
+    sha256 = "sha256-IhesxYuOsxMAYx66514iLrxwDJwc9kCAiHBdGaRyyDk=";
   };
 
   nativeBuildInputs = [ pkg-config autoreconfHook ];
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 9b01d4153e6..784178cba9c 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -30110,6 +30110,8 @@ in
 
   nix-store-gcs-proxy = callPackage ../tools/nix/nix-store-gcs-proxy {};
 
+  webwormhole = callPackage ../tools/networking/webwormhole { };
+
   wifi-password = callPackage ../os-specific/darwin/wifi-password {};
 
   qubes-core-vchan-xen = callPackage ../applications/qubes/qubes-core-vchan-xen {};