diff --git a/pkgs/by-name/sd/sdrpp/cmake4.patch b/pkgs/by-name/sd/sdrpp/cmake4.patch
new file mode 100644
index 000000000000..c40373d99f6b
--- /dev/null
+++ b/pkgs/by-name/sd/sdrpp/cmake4.patch
@@ -0,0 +1,27 @@
+diff --git a/core/libcorrect/CMakeLists.txt b/core/libcorrect/CMakeLists.txt
+index 7fce281d..b709255f 100644
+--- a/core/libcorrect/CMakeLists.txt
++++ b/core/libcorrect/CMakeLists.txt
+@@ -1,4 +1,4 @@
+-cmake_minimum_required(VERSION 2.8)
++cmake_minimum_required(VERSION 3.13)
+ project(Correct C)
+ include(CheckLibraryExists)
+ include(CheckIncludeFiles)
+diff --git a/misc_modules/discord_integration/discord-rpc/CMakeLists.txt b/misc_modules/discord_integration/discord-rpc/CMakeLists.txt
+index 1dc1c913..e9924677 100644
+--- a/misc_modules/discord_integration/discord-rpc/CMakeLists.txt
++++ b/misc_modules/discord_integration/discord-rpc/CMakeLists.txt
+@@ -1,4 +1,4 @@
+-cmake_minimum_required (VERSION 3.2.0)
++cmake_minimum_required (VERSION 3.13)
+ project (DiscordRPC)
+ 
+ include(GNUInstallDirs)
+@@ -11,4 +11,4 @@ file(GLOB_RECURSE ALL_SOURCE_FILES
+ 
+ # add subdirs
+ 
+-add_subdirectory(src)
+\ No newline at end of file
++add_subdirectory(src)
diff --git a/pkgs/by-name/sd/sdrpp/package.nix b/pkgs/by-name/sd/sdrpp/package.nix
index 847fea651aae..19bba205f0b5 100644
--- a/pkgs/by-name/sd/sdrpp/package.nix
+++ b/pkgs/by-name/sd/sdrpp/package.nix
@@ -69,18 +69,26 @@ stdenv.mkDerivation rec {
   # SDR++ uses a rolling release model.
   # Choose a git hash from head and use the date from that commit as
   # version qualifier
-  git_hash = "27ab5bf3c194169ddf60ca312723fce96149cc8e";
-  git_date = "2024-01-22";
-  version = "1.1.0-unstable-" + git_date;
+  git_rev = "4658a1ade6707dee6f2ae09ba9eb71097223ea93";
+  git_hash = "sha256-UxYAcqOMPQYdUbL2636LpOGbCaxHjLiJhsH62s+0AZU=";
+  git_date = "2025-10-09";
+  version_number = "1.2.1";
+
+  version = "${version_number}-unstable-" + git_date;
 
   src = fetchFromGitHub {
     owner = "AlexandreRouma";
     repo = "SDRPlusPlus";
-    rev = git_hash;
-    hash = "sha256-R4xWeqdHEAaje37VQaGlg+L2iYIOH4tXMHvZkZq4SDU=";
+    rev = git_rev;
+    hash = git_hash;
   };
 
-  patches = [ ./runtime-prefix.patch ];
+  patches = [
+    ./runtime-prefix.patch
+    # CMake 4 dropped support of versions lower than 3.5,
+    # versions lower than 3.10 are deprecated.
+    ./cmake4.patch
+  ];
 
   postPatch = ''
     substituteInPlace CMakeLists.txt \
@@ -90,7 +98,7 @@ stdenv.mkDerivation rec {
       --replace "codec2.h" "codec2/codec2.h"
     # Since the __TIME_ and __DATE__ is canonicalized in the build,
     # use our qualified version shown in the programs window title.
-    substituteInPlace core/src/version.h --replace "1.1.0" "$version"
+    substituteInPlace core/src/version.h --replace-fail "${version_number}" "$version"
   '';
 
   nativeBuildInputs = [