diff --git a/pkgs/by-name/dc/dcpomatic/libdcp.nix b/pkgs/by-name/dc/dcpomatic/libdcp.nix
index 4f05059d69a5..3ad357d2fdbf 100644
--- a/pkgs/by-name/dc/dcpomatic/libdcp.nix
+++ b/pkgs/by-name/dc/dcpomatic/libdcp.nix
@@ -26,12 +26,12 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "libdcp";
-  version = "1.10.61";
+  version = "1.10.63";
 
   src = fetchgit {
     url = "https://git.carlh.net/git/libdcp";
     tag = "v${finalAttrs.version}";
-    hash = "sha256-MV2kANCq8IqsSJIk95rqIX7iSGmnDVetXPMLn5mEOEs=";
+    hash = "sha256-nT9wSOY/OPNRxpjnp+wblx7Jbx/S0uP7lL68zBK4NFk=";
   };
 
   # for some reason the version is not set properly upstream
diff --git a/pkgs/by-name/dc/dcpomatic/libsub.nix b/pkgs/by-name/dc/dcpomatic/libsub.nix
index d28c4162c514..76926e08e4d3 100644
--- a/pkgs/by-name/dc/dcpomatic/libsub.nix
+++ b/pkgs/by-name/dc/dcpomatic/libsub.nix
@@ -14,12 +14,12 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "libsub";
-  version = "1.6.62";
+  version = "1.6.64";
 
   src = fetchgit {
     url = "https://git.carlh.net/git/libsub";
     tag = "v${finalAttrs.version}";
-    hash = "sha256-NSCg+YnxUPII16K1SGozBRYorm0UVGTGozJOhLti4kc=";
+    hash = "sha256-5umGV7qzh0iYkWbnnSVAtENhI9nIk+AE7pZHbDZuArk=";
   };
 
   # for some reason the version is not set properly upstream
diff --git a/pkgs/by-name/dc/dcpomatic/package.nix b/pkgs/by-name/dc/dcpomatic/package.nix
index a9815ee449c1..b10d624172e0 100644
--- a/pkgs/by-name/dc/dcpomatic/package.nix
+++ b/pkgs/by-name/dc/dcpomatic/package.nix
@@ -47,12 +47,12 @@ let
 in
 stdenv.mkDerivation (finalAttrs: {
   pname = "dcpomatic";
-  version = "2.19.1";
+  version = "2.18.50";
 
   src = fetchgit {
     url = "https://git.carlh.net/git/dcpomatic";
     tag = "v${finalAttrs.version}";
-    hash = "sha256-c+An8V/A7Vk0ChGQULk9uj0zN5slLb8wSKlWl+3uL1Y=";
+    hash = "sha256-qYzV8tXISGCYAzoJJDhx/xDZAS4HD8VwE3Z0CsCjIZs=";
   };
 
   nativeBuildInputs = [