diff --git a/pkgs/development/libraries/nlohmann_json/default.nix b/pkgs/development/libraries/nlohmann_json/default.nix
index 25d4386cec2..d57461853d3 100644
--- a/pkgs/development/libraries/nlohmann_json/default.nix
+++ b/pkgs/development/libraries/nlohmann_json/default.nix
@@ -3,13 +3,13 @@
 
 stdenv.mkDerivation rec {
   name = "nlohmann_json-${version}";
-  version = "3.3.0";
+  version = "3.4.0";
 
   src = fetchFromGitHub {
     owner = "nlohmann";
     repo = "json";
     rev = "v${version}";
-    sha256 = "1plg9l1avnjsg6khrd88yj9cbzbbkwzpc5synmicqndb35wndn5h";
+    sha256 = "1140gz5za7yvfcphdgxaq1dm4b1vxy1m8d1w0s0smv4vvdvl26ym";
   };
 
   nativeBuildInputs = [ cmake ];