diff --git a/json.spec b/json.spec
index 10da73be45b..6f6788f6f06 100644
--- a/json.spec
+++ b/json.spec
@@ -1,16 +1,21 @@
-### RPM external json 3.10.2
+### RPM external json 3.11.3
 ## NOCOMPILER
 
-Source: https://github.com/nlohmann/%{n}/releases/download/v%{realversion}/include.zip
+Source: https://github.com/nlohmann/json/archive/refs/tags/v%{realversion}.tar.gz
 
 %prep
-%setup -c
+%setup -n %{n}-%{realversion}
 
 %build
+rm -rf ../build; mkdir ../build; cd ../build
+cmake ../%{n}-%{realversion} \
+  -DCMAKE_INSTALL_PREFIX:PATH="%i" \
+  -DCMAKE_BUILD_TYPE=%{cmake_build_type} \
+  -DJSON_BuildTests=OFF \
+  -DJSON_MultipleHeaders=OFF
 
-%install
-mkdir -p %{i}/include/nlohmann
-cp -a include/nlohmann/json_fwd.hpp     %{i}/include/nlohmann/
-cp -a single_include/nlohmann/json.hpp  %{i}/include/nlohmann/
+make %makeprocesses VERBOSE=1
 
-%post
+%install
+cd ../build
+make install