diff --git a/pkgs/development/libraries/libpcap/default.nix b/pkgs/development/libraries/libpcap/default.nix
index 04c8a0f16ad8..37043e3e4bde 100644
--- a/pkgs/development/libraries/libpcap/default.nix
+++ b/pkgs/development/libraries/libpcap/default.nix
@@ -13,11 +13,11 @@
 
 stdenv.mkDerivation rec {
   pname = "libpcap";
-  version = "1.10.3";
+  version = "1.10.4";
 
   src = fetchurl {
     url = "https://www.tcpdump.org/release/${pname}-${version}.tar.gz";
-    sha256 = "sha256-KoiFxANRbPewkz7UsU1sqjDgIFJInr1BTcdaxS51WeY=";
+    hash = "sha256-7RmgOD+tcuOtQ1/SOdfNgNZJFrhyaVUBWdIORxYOvl8=";
   };
 
   buildInputs = lib.optionals stdenv.isLinux [ libnl ]
diff --git a/pkgs/tools/networking/tcpdump/default.nix b/pkgs/tools/networking/tcpdump/default.nix
index 9ccf68aa5437..7fdea769b1c8 100644
--- a/pkgs/tools/networking/tcpdump/default.nix
+++ b/pkgs/tools/networking/tcpdump/default.nix
@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   pname = "tcpdump";
-  version = "4.99.3";
+  version = "4.99.4";
 
   src = fetchurl {
     url = "http://www.tcpdump.org/release/tcpdump-${version}.tar.gz";
-    sha256 = "sha256-rXWm7T3A2XMpRbLlSDy0Hci0tSihaTFeSZxoYZUuc7M=";
+    hash = "sha256-AjIjG7LynWvyQm5woIp+DGOg1ZqbRIY7f14jV6bkn+o=";
   };
 
   postPatch = ''