diff --git a/pkgs/desktops/deepin/default.nix b/pkgs/desktops/deepin/default.nix
index 869f08154bb..61db4ca0571 100644
--- a/pkgs/desktops/deepin/default.nix
+++ b/pkgs/desktops/deepin/default.nix
@@ -39,7 +39,7 @@ let
     deepin-turbo = callPackage ./deepin-turbo { };
     deepin-wallpapers = callPackage ./deepin-wallpapers { };
     deepin-wm = callPackage ./deepin-wm {
-      vala = pkgs.vala_0_42;
+      vala = pkgs.vala_0_40;
     };
     dpa-ext-gnomekeyring = callPackage ./dpa-ext-gnomekeyring { };
     dtkcore = callPackage ./dtkcore { };
diff --git a/pkgs/development/compilers/vala/default.nix b/pkgs/development/compilers/vala/default.nix
index eeb4b5431fe..9f4d8b66860 100644
--- a/pkgs/development/compilers/vala/default.nix
+++ b/pkgs/development/compilers/vala/default.nix
@@ -28,11 +28,6 @@ let
         #     0.40.12: https://github.com/openembedded/openembedded-core/raw/8553c52f174af4c8c433c543f806f5ed5c1ec48c/meta/recipes-devtools/vala/vala/disable-graphviz.patch
         "0.40" = ./disable-graphviz-0.40.12.patch;
 
-        "0.42" = fp {
-          commit = "f2b4f9ec6f44dced7f88df849cca68961419eeb8";
-          sha256 = "112qhdzix0d7lfpfcam1cxprzmfzpwypb1226m5ma1vq9qy0sn7g";
-        };
-
         # NOTE: the openembedded-core project doesn't have a patch for 0.44.1
         # We've reverted the addition of the "--disable-valadoc" option
         # and then applied the following patch.
@@ -115,11 +110,6 @@ in rec {
     sha256 = "0vv25fmr9jqiqf080vak1x4raa4w3cz3n5ysjglqsq9qfx304i7b";
   };
 
-  vala_0_42 = generic {
-    version = "0.42.7";
-    sha256 = "029ksbsdpl581wzy570kj4kkw8b4bizgh494c051zsvkwck55p83";
-  };
-
   vala_0_44 = generic {
     version = "0.44.7";
     sha256 = "0z5xy4qc95rm2gj7s2k14xm1xp3mrf0yz64fx4kddqjxkpsz87xz";
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 033d978b1af..72c818a455e 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -8518,7 +8518,6 @@ in
   inherit (callPackage ../development/compilers/vala { })
     vala_0_36
     vala_0_40
-    vala_0_42
     vala_0_44
     vala_0_46
     vala;