diff --git a/pkgs/development/compilers/pakcs/default.nix b/pkgs/development/compilers/pakcs/default.nix
index a118e7ab73b..0b46bd1f24d 100644
--- a/pkgs/development/compilers/pakcs/default.nix
+++ b/pkgs/development/compilers/pakcs/default.nix
@@ -4,13 +4,13 @@
 , curl, git, unzip, gnutar, coreutils, sqlite }:
 
 let
-  name = "pakcs-2.1.1";
+  name = "pakcs-2.1.2";
 
   # Don't switch to development release without a reason, because its
   # source updates without version bump. Prefer current release instead.
   src = fetchurl {
     url = "https://www.informatik.uni-kiel.de/~pakcs/download/${name}-src.tar.gz";
-    sha256 = "112v9ynqfbbm4x770mcfrai9v5bh7c3zn7jka80pv6v4y65r778c";
+    sha256 = "0i0nprli3knc7zlp5qkqkpiq3ny36v52hnvgph376l3ajjds7wf6";
   };
 
   curry-frontend = (haskellPackages.override {
@@ -43,9 +43,14 @@ in stdenv.mkDerivation {
     # Since we can't expand $out in `makeFlags`
     #makeFlags="$makeFlags PAKCSINSTALLDIR=$out/pakcs"
 
-    substituteInPlace currytools/cpm/src/CPM/Repository.curry \
-      --replace "/bin/rm" "rm"
-  '';
+    for file in currytools/cpm/src/CPM/Repository.curry \
+                currytools/cpm/src/CPM/Repository/CacheDB.curry \
+                scripts/compile-all-libs.sh \
+                scripts/cleancurry.sh \
+                examples/test.sh testsuite/test.sh lib/test.sh; do
+        substituteInPlace $file --replace "/bin/rm" "rm"
+    done
+  '' ;
 
   # cypm new: EXISTENCE ERROR: source_sink
   # "/tmp/nix-build-pakcs-2.0.2.drv-0/pakcs-2.0.2/currytools/cpm/templates/LICENSE"
diff --git a/pkgs/development/compilers/swi-prolog/default.nix b/pkgs/development/compilers/swi-prolog/default.nix
index 8c79deb9832..cbcfd7efb40 100644
--- a/pkgs/development/compilers/swi-prolog/default.nix
+++ b/pkgs/development/compilers/swi-prolog/default.nix
@@ -9,7 +9,7 @@
 }:
 
 let
-  version = "8.1.4";
+  version = "8.1.15";
   packInstall = swiplPath: pack:
     ''${swiplPath}/bin/swipl -g "pack_install(${pack}, [package_directory(\"${swiplPath}/lib/swipl/pack\"), silent(true), interactive(false)])." -t "halt."
     '';
@@ -21,7 +21,7 @@ stdenv.mkDerivation {
   src = fetchgit {
     url = "https://github.com/SWI-Prolog/swipl-devel";
     rev = "V${version}";
-    sha256 = "0qxa6f5dypwczxajlf0l736adbjb17cbak3qsh5g04hpv2bxm6dh";
+    sha256 = "0czbrscx2s4079nmwvipp9cnwfny16m3fpnp823llm7wyljchgvq";
   };
 
   buildInputs = [ cacert git cmake gmp readline openssl