diff --git a/pkgs/applications/audio/pd-plugins/cyclone/default.nix b/pkgs/applications/audio/pd-plugins/cyclone/default.nix
index bc099b9f3ea5..12efbfb64a4c 100644
--- a/pkgs/applications/audio/pd-plugins/cyclone/default.nix
+++ b/pkgs/applications/audio/pd-plugins/cyclone/default.nix
@@ -8,7 +8,7 @@ stdenv.mkDerivation rec {
     owner = "porres";
     repo = "pd-cyclone";
     rev = "7c470fb03db66057a2198843b635ac3f1abde84d";
-    sha256 = "ixfnmeoRzV0qEOOIxCV1361t3d59fwxjHWhz9uXQ2ps=";
+    hash = "sha256-ixfnmeoRzV0qEOOIxCV1361t3d59fwxjHWhz9uXQ2ps=";
   };
 
   buildInputs = [ puredata ];
@@ -27,7 +27,7 @@ stdenv.mkDerivation rec {
     description = "A library of PureData classes, bringing some level of compatibility between Max/MSP and Pd environments";
     homepage = "http://puredata.info/downloads/cyclone";
     license = licenses.tcltk;
-    maintainers = [ maintainers.magnetophon maintainers.carlthome ];
+    maintainers = with maintainers; [ magnetophon carlthome ];
     platforms = platforms.linux;
   };
 }
diff --git a/pkgs/applications/audio/pd-plugins/gem/default.nix b/pkgs/applications/audio/pd-plugins/gem/default.nix
index 070cb02dc3b1..7bfdb1bd8a8a 100644
--- a/pkgs/applications/audio/pd-plugins/gem/default.nix
+++ b/pkgs/applications/audio/pd-plugins/gem/default.nix
@@ -22,7 +22,7 @@ stdenv.mkDerivation rec {
     owner = "umlaeute";
     repo = "Gem";
     rev = "4ec12eef8716822c68f7c02a5a94668d2427037d";
-    sha256 = "Y/Z7oJdKGd7+aSk8eAN9qu4ss+BOvzaXWpWGjfJqGJ8=";
+    hash = "sha256-Y/Z7oJdKGd7+aSk8eAN9qu4ss+BOvzaXWpWGjfJqGJ8=";
   };
 
   nativeBuildInputs = [
@@ -45,7 +45,7 @@ stdenv.mkDerivation rec {
     description = "Graphics Environment for Multimedia";
     homepage = "http://puredata.info/downloads/gem";
     license = licenses.gpl2Plus;
-    maintainers = [ maintainers.raboof maintainers.carlthome ];
+    maintainers = with maintainers; [ raboof carlthome ];
     platforms = platforms.linux;
   };
 }
diff --git a/pkgs/applications/audio/puredata/default.nix b/pkgs/applications/audio/puredata/default.nix
index b1c64617bff5..f8df443f5c78 100644
--- a/pkgs/applications/audio/puredata/default.nix
+++ b/pkgs/applications/audio/puredata/default.nix
@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
 
   src = fetchurl {
     url = "http://msp.ucsd.edu/Software/pd-${version}.src.tar.gz";
-    sha256 = "6MFKfYV5CWxuOsm1V4LaYChIRIlx0Qcwah5SbtBFZIU=";
+    hash = "sha256-6MFKfYV5CWxuOsm1V4LaYChIRIlx0Qcwah5SbtBFZIU=";
   };
 
   nativeBuildInputs = [ autoreconfHook gettext makeWrapper ];
@@ -54,7 +54,7 @@ stdenv.mkDerivation rec {
     homepage = "http://puredata.info";
     license = licenses.bsd3;
     platforms = platforms.linux ++ platforms.darwin;
-    maintainers = [ maintainers.goibhniu maintainers.carlthome ];
+    maintainers = with maintainers; [ goibhniu carlthome ];
     mainProgram = "pd";
     changelog = "https://msp.puredata.info/Pd_documentation/x5.htm#s1";
   };