diff --git a/pkgs/development/compilers/iasl/default.nix b/pkgs/development/compilers/iasl/default.nix
index fb6bd41344ad..a31e1ff3f6a9 100644
--- a/pkgs/development/compilers/iasl/default.nix
+++ b/pkgs/development/compilers/iasl/default.nix
@@ -1,24 +1,27 @@
-{lib, stdenv, fetchurl, fetchpatch, bison, flex}:
+{lib, stdenv, fetchurl, bison, flex}:
 
 stdenv.mkDerivation rec {
   pname = "iasl";
-  version = "20200110";
+  version = "20210730";
 
   src = fetchurl {
     url = "https://acpica.org/sites/acpica/files/acpica-unix-${version}.tar.gz";
-    sha256 = "1cb6aa6acrixmdzvj9vv4qs9lmlsbkd27pjlz14i1kq1x3xn0gwx";
+    sha256 = "1pmm977nyl3bs71ipzcl4dh30qm8x9wm2p2ml0m62rl62kai832a";
   };
 
   NIX_CFLAGS_COMPILE = "-O3";
 
   buildFlags = [ "iasl" ];
 
-  buildInputs = [ bison flex ];
+  nativeBuildInputs = [ bison flex ];
 
   installPhase =
     ''
-      install -d $out/bin
-      install generate/unix/bin*/iasl $out/bin
+      runHook preInstall
+
+      install -Dm755 generate/unix/bin*/iasl -t $out/bin
+
+      runHook postInstall
     '';
 
   meta = {
diff --git a/pkgs/tools/system/acpica-tools/default.nix b/pkgs/tools/system/acpica-tools/default.nix
index 36ad8ff06e38..2d2033aadef3 100644
--- a/pkgs/tools/system/acpica-tools/default.nix
+++ b/pkgs/tools/system/acpica-tools/default.nix
@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   pname = "acpica-tools";
-  version = "20200430";
+  version = "20210730";
 
   src = fetchurl {
     url = "https://acpica.org/sites/acpica/files/acpica-unix-${version}.tar.gz";
-    sha256 = "0z19bniqsa8y0n1qrxmb6gz7m63jpwx22zgk5ablyriixhfpz07v";
+    sha256 = "1pmm977nyl3bs71ipzcl4dh30qm8x9wm2p2ml0m62rl62kai832a";
   };
 
   NIX_CFLAGS_COMPILE = "-O3";
@@ -16,9 +16,10 @@ stdenv.mkDerivation rec {
   buildFlags = [
     "acpibin"
     "acpidump"
+    "acpiexamples"
     "acpiexec"
     "acpihelp"
-    "acpinames"
+    "acpisrc"
     "acpixtract"
   ];
 
@@ -29,7 +30,7 @@ stdenv.mkDerivation rec {
   meta = with lib; {
     description = "ACPICA Tools";
     homepage = "https://www.acpica.org/";
-    license = with licenses; [ gpl2 bsd3 ];
+    license = with licenses; [ iasl gpl2Only bsd3 ];
     platforms = platforms.linux;
     maintainers = with maintainers; [ tadfisher ];
   };