diff --git a/pkgs/development/libraries/json-c/default.nix b/pkgs/development/libraries/json-c/default.nix
index c7a9b3c4a12..164f7c44ba9 100644
--- a/pkgs/development/libraries/json-c/default.nix
+++ b/pkgs/development/libraries/json-c/default.nix
@@ -1,24 +1,24 @@
-{ stdenv, fetchurl, fetchpatch, autoconf }:
+{ stdenv, fetchurl, fetchpatch, cmake }:
 
 stdenv.mkDerivation rec {
-  name = "json-c-0.13.1";
+  name = "json-c-0.14";
   src = fetchurl {
     url    = "https://s3.amazonaws.com/json-c_releases/releases/${name}-nodoc.tar.gz";
-    sha256 = "0ch1v18wk703bpbyzj7h1mkwvsw4rw4qdwvgykscypvqq10678ll";
+    sha256 = "1yia8417qljmczs9w3rn4c4i2p2iywq098pgrj11s81599j4x4cr";
   };
 
   patches = [
     # https://nvd.nist.gov/vuln/detail/CVE-2020-12762
     (fetchpatch {
       name = "CVE-2020-12762.patch";
-      url = "https://github.com/json-c/json-c/commit/865b5a65199973bb63dff8e47a2f57e04fec9736.patch";
-      sha256 = "1g5afk4khhm1sb70xrva1pyznshcw3ipzp1g5z60dpzxy303pp6h";
+      url = "https://github.com/json-c/json-c/commit/5d6fa331418d49f1bd488553fd1cfa9ab023fabb.patch";
+      sha256 = "0aar7kgbycqxnhh0lrr61adfbb903nbapalhs5i6h8anxwy1ylcm";
     })
   ];
 
   outputs = [ "out" "dev" ];
 
-  nativeBuildInputs = [ autoconf ];  # for autoheader
+  nativeBuildInputs = [ cmake ];
 
   meta = with stdenv.lib; {
     description = "A JSON implementation in C";
diff --git a/pkgs/development/libraries/libu2f-host/default.nix b/pkgs/development/libraries/libu2f-host/default.nix
index f033aa9f610..a9c62673115 100644
--- a/pkgs/development/libraries/libu2f-host/default.nix
+++ b/pkgs/development/libraries/libu2f-host/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, pkgconfig, json_c, hidapi }:
+{ stdenv, fetchurl, fetchpatch, pkgconfig, json_c, hidapi }:
 
 stdenv.mkDerivation rec {
   pname = "libu2f-host";
@@ -9,6 +9,15 @@ stdenv.mkDerivation rec {
     sha256 = "0vrivl1dwql6nfi48z6dy56fwy2z13d7abgahgrs2mcmqng7hra2";
   };
 
+  patches = [
+    # remove after updating to next release
+    (fetchpatch {
+      name = "json-c-0.14-support.patch";
+      url = "https://github.com/Yubico/libu2f-host/commit/840f01135d2892f45e71b9e90405de587991bd03.patch";
+      sha256 = "0xplx394ppsbsb4h4l8b9m4dv9shbl0zyck3y26vbm9i1g981ki7";
+    })
+  ];
+
   nativeBuildInputs = [ pkgconfig ];
   buildInputs = [ json_c hidapi ];
 
diff --git a/pkgs/development/libraries/libu2f-server/default.nix b/pkgs/development/libraries/libu2f-server/default.nix
index be5658914d1..cd961cde1d2 100644
--- a/pkgs/development/libraries/libu2f-server/default.nix
+++ b/pkgs/development/libraries/libu2f-server/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, pkgconfig, json_c, openssl, check, file, help2man, which, gengetopt }:
+{ stdenv, fetchurl, fetchpatch, pkgconfig, json_c, openssl, check, file, help2man, which, gengetopt }:
 
 stdenv.mkDerivation rec {
   name = "libu2f-server-1.1.0";
@@ -7,6 +7,15 @@ stdenv.mkDerivation rec {
     sha256 = "0xx296nmmqa57w0v5p2kasl5zr1ms2gh6qi4lhv6xvzbmjp3rkcd";
   };
 
+  patches = [
+    # remove after updating to next release
+    (fetchpatch {
+      name = "json-c-0.14-support.patch";
+      url = "https://github.com/Yubico/libu2f-server/commit/f7c4983b31909299c47bf9b2627c84b6bfe225de.patch";
+      sha256 = "10q66w3paii1yhfdmjskpip078fk9p3sjllbqx1yx71qbjki55b0";
+    })
+  ];
+
   nativeBuildInputs = [ pkgconfig ];
   buildInputs = [ json_c openssl check file help2man which gengetopt ];
 
diff --git a/pkgs/os-specific/linux/multipath-tools/default.nix b/pkgs/os-specific/linux/multipath-tools/default.nix
index d60b4a9a549..1c00ed9887d 100644
--- a/pkgs/os-specific/linux/multipath-tools/default.nix
+++ b/pkgs/os-specific/linux/multipath-tools/default.nix
@@ -10,6 +10,11 @@ stdenv.mkDerivation rec {
     sha256 = "1mgjylklh1cx8px8ffgl12kyc0ln3445vbabd2sy8chq31rpiiq8";
   };
 
+  patches = [
+    # fix build with json-c 0.14 https://www.redhat.com/archives/dm-devel/2020-May/msg00261.html
+    ./json-c-0.14.patch
+  ];
+
   postPatch = ''
     substituteInPlace libmultipath/Makefile --replace /usr/include/libdevmapper.h ${lvm2}/include/libdevmapper.h
     sed -i -re '
diff --git a/pkgs/os-specific/linux/multipath-tools/json-c-0.14.patch b/pkgs/os-specific/linux/multipath-tools/json-c-0.14.patch
new file mode 100644
index 00000000000..d5fee424883
--- /dev/null
+++ b/pkgs/os-specific/linux/multipath-tools/json-c-0.14.patch
@@ -0,0 +1,21 @@
+diff --git a/libdmmp/libdmmp_private.h b/libdmmp/libdmmp_private.h
+index ac85b63f..b1a6ddea 100644
+--- a/libdmmp/libdmmp_private.h
++++ b/libdmmp/libdmmp_private.h
+@@ -30,6 +30,7 @@
+ #include <stdint.h>
+ #include <string.h>
+ #include <assert.h>
++#include <stdbool.h>
+ #include <json.h>
+ 
+ #include "libdmmp/libdmmp.h"
+@@ -82,7 +83,7 @@ static out_type func_name(struct dmmp_context *ctx, const char *var_name) { \
+ do { \
+ 	json_type j_type = json_type_null; \
+ 	json_object *j_obj_tmp = NULL; \
+-	if (json_object_object_get_ex(j_obj, key, &j_obj_tmp) != TRUE) { \
++	if (json_object_object_get_ex(j_obj, key, &j_obj_tmp) != true) { \
+ 		_error(ctx, "Invalid JSON output from multipathd IPC: " \
+ 		       "key '%s' not found", key); \
+ 		rc = DMMP_ERR_IPC_ERROR; \
diff --git a/pkgs/tools/misc/yubikey-personalization/default.nix b/pkgs/tools/misc/yubikey-personalization/default.nix
index 5ef828762f6..69e3d588653 100644
--- a/pkgs/tools/misc/yubikey-personalization/default.nix
+++ b/pkgs/tools/misc/yubikey-personalization/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, pkgconfig, libusb1, libyubikey, json_c }:
+{ stdenv, fetchurl, fetchpatch, pkgconfig, libusb1, libyubikey, json_c }:
 
 stdenv.mkDerivation rec {
   pname = "yubikey-personalization";
@@ -9,6 +9,15 @@ stdenv.mkDerivation rec {
     sha256 = "14wvlwqnwj0gllkpvfqiy8ns938bwvjsz8x1hmymmx32m074vj0f";
   };
 
+  patches = [
+    # remove after updating to next release
+    (fetchpatch {
+      name = "json-c-0.14-support.patch";
+      url = "https://github.com/Yubico/yubikey-personalization/commit/0aa2e2cae2e1777863993a10c809bb50f4cde7f8.patch";
+      sha256 = "1wnigf3hbq59i15kgxpq3pwrl1drpbj134x81mmv9xm1r44cjva8";
+    })
+  ];
+
   nativeBuildInputs = [ pkgconfig ];
   buildInputs = [ libusb1 libyubikey json_c ];
 
diff --git a/pkgs/tools/networking/connman/connman-ncurses/default.nix b/pkgs/tools/networking/connman/connman-ncurses/default.nix
index 7bfb4571e10..1e7f54f9ddb 100644
--- a/pkgs/tools/networking/connman/connman-ncurses/default.nix
+++ b/pkgs/tools/networking/connman/connman-ncurses/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, autoreconfHook, pkgconfig, dbus, json_c, ncurses, connman }:
+{ stdenv, fetchpatch, fetchFromGitHub, autoreconfHook, pkgconfig, dbus, json_c, ncurses, connman }:
 
 stdenv.mkDerivation {
   pname = "connman-ncurses";
@@ -11,12 +11,21 @@ stdenv.mkDerivation {
     sha256 = "1831r0776fv481g8kgy1dkl750pzv47835dw11sslq2k6mm6i9p1";
   };
 
+  patches = [
+    # Fix build with json-c 0.14
+    (fetchpatch {
+      url = "https://github.com/void-linux/void-packages/raw/5830ce60e922b7dced8157ededda8c995adb3bb9/srcpkgs/connman-ncurses/patches/lowercase-boolean.patch";
+      extraPrefix = "";
+      sha256 = "uK83DeRyXS2Y0ZZpTYvYNh/1ZM2QQ7QpajiBztaEuSM=";
+    })
+  ];
+
   nativeBuildInputs = [ autoreconfHook pkgconfig ];
 
   buildInputs = [ dbus ncurses json_c connman ];
 
   NIX_CFLAGS_COMPILE = "-Wno-error";
-  
+
   installPhase = ''
     mkdir -p "$out/bin"
     cp -va connman_ncurses "$out/bin/"
diff --git a/pkgs/tools/security/zmap/cmake-json-0.14-fix.patch b/pkgs/tools/security/zmap/cmake-json-0.14-fix.patch
new file mode 100644
index 00000000000..1c132948af6
--- /dev/null
+++ b/pkgs/tools/security/zmap/cmake-json-0.14-fix.patch
@@ -0,0 +1,13 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 8bd825f..694d9b2 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -72,6 +72,8 @@ if(WITH_JSON)
+     endif()
+ 
+     add_definitions("-DJSON")
++    # JSON_CFLAGS is a list, i.e. semicolon-separated, convert it to space-separated
++    string(REPLACE ";" " " JSON_CFLAGS "${JSON_CFLAGS}")
+     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${JSON_CFLAGS}")
+ endif()
+ 
diff --git a/pkgs/tools/security/zmap/default.nix b/pkgs/tools/security/zmap/default.nix
index ef36b21641b..e2350b67c7d 100644
--- a/pkgs/tools/security/zmap/default.nix
+++ b/pkgs/tools/security/zmap/default.nix
@@ -13,6 +13,11 @@ stdenv.mkDerivation rec {
     sha256 = "0yaahaiawkjk020hvsb8pndbrk8k10wxkfba1irp12a4sj6rywcs";
   };
 
+  patches = [
+    # fix build with json-c 0.14 https://github.com/zmap/zmap/pull/609
+    ./cmake-json-0.14-fix.patch
+  ];
+
   cmakeFlags = [ "-DRESPECT_INSTALL_PREFIX_CONFIG=ON" ];
   dontUseCmakeBuildDir = true;