diff --git a/pkgs/tools/misc/diffoscope/default.nix b/pkgs/tools/misc/diffoscope/default.nix
index bf5d4601475a..1733e1309b40 100644
--- a/pkgs/tools/misc/diffoscope/default.nix
+++ b/pkgs/tools/misc/diffoscope/default.nix
@@ -9,17 +9,22 @@
 # Note: when upgrading this package, please run the list-missing-tools.sh script as described below!
 python3Packages.buildPythonApplication rec {
   pname = "diffoscope";
-  version = "183";
+  version = "185";
 
   src = fetchurl {
     url = "https://diffoscope.org/archive/diffoscope-${version}.tar.bz2";
-    sha256 = "sha256-XFFrRmCpE2UvZRCELfPaotLklyjLiCDWkyFWkISOHZM=";
+    sha256 = "sha256-Spw7/+vQ1jd3rMZ792du04di0zleRNp8LUEki1374O8=";
   };
 
   outputs = [ "out" "man" ];
 
   patches = [
     ./ignore_links.patch
+
+    # due to https://salsa.debian.org/reproducible-builds/diffoscope/-/commit/953a599c2b903298b038b34abf515cea69f4fc19
+    # the version detection of LLVM is broken and the comparison result is compared against
+    # the expected result from LLVM 10 (rather than 7 which is our default).
+    ./fix-tests.patch
   ];
 
   postPatch = ''
diff --git a/pkgs/tools/misc/diffoscope/fix-tests.patch b/pkgs/tools/misc/diffoscope/fix-tests.patch
new file mode 100644
index 000000000000..b5566cb932f7
--- /dev/null
+++ b/pkgs/tools/misc/diffoscope/fix-tests.patch
@@ -0,0 +1,14 @@
+diff --git a/tests/comparators/test_rlib.py b/tests/comparators/test_rlib.py
+index 8d201ab..05960aa 100644
+--- a/tests/comparators/test_rlib.py
++++ b/tests/comparators/test_rlib.py
+@@ -81,9 +81,6 @@ def rlib_dis_expected_diff():
+     if actual_ver >= "7.0":
+         diff_file = "rlib_llvm_dis_expected_diff_7"
+ 
+-    if actual_ver >= "10.0":
+-        diff_file = "rlib_llvm_dis_expected_diff_10"
+-
+     return get_data(diff_file)
+ 
+