diff --git a/pkgs/by-name/ha/harlequin/package.nix b/pkgs/by-name/ha/harlequin/package.nix
index e344a1a891c4..26246b46aa86 100644
--- a/pkgs/by-name/ha/harlequin/package.nix
+++ b/pkgs/by-name/ha/harlequin/package.nix
@@ -1,7 +1,7 @@
 {
   lib,
   stdenv,
-  python3Packages,
+  python3,
   fetchFromGitHub,
   nix-update-script,
   glibcLocales,
@@ -10,6 +10,23 @@
   withPostgresAdapter ? true,
   withBigQueryAdapter ? true,
 }:
+
+let
+  python = python3.override {
+    packageOverrides = _final: prev: {
+      # throws a runtime error with textual 8.2.5:
+      # KeyError: 'textual-ansi'
+      textual = prev.textual.overridePythonAttrs (old: rec {
+        version = "8.2.4";
+        src = old.src.override {
+          tag = "v${version}";
+          hash = "sha256-827cm9pcj1o1FYeaoWKCJ6dEyXeDop4kYd205cySTfg=";
+        };
+      });
+    };
+  };
+  python3Packages = python.pkgs;
+in
 python3Packages.buildPythonApplication (finalAttrs: {
   pname = "harlequin";
   version = "2.5.2";
diff --git a/pkgs/by-name/mi/mistral-vibe/package.nix b/pkgs/by-name/mi/mistral-vibe/package.nix
index adbeb158d070..0552f7cc8946 100644
--- a/pkgs/by-name/mi/mistral-vibe/package.nix
+++ b/pkgs/by-name/mi/mistral-vibe/package.nix
@@ -22,6 +22,15 @@ let
           hash = "sha256-1KVy9s+zjlB4w7E45PMCWRxPus24bgBmmM3k2R9d+Jg=";
         };
       });
+      # 112/2907 tests fail with textual 8.2.5:
+      # textual.app.InvalidThemeError: Theme 'textual-ansi' has not been registered.
+      textual = prev.textual.overridePythonAttrs (old: rec {
+        version = "8.2.4";
+        src = old.src.override {
+          tag = "v${version}";
+          hash = "sha256-827cm9pcj1o1FYeaoWKCJ6dEyXeDop4kYd205cySTfg=";
+        };
+      });
     };
   };
   python3Packages = python.pkgs;
diff --git a/pkgs/development/python-modules/textual/default.nix b/pkgs/development/python-modules/textual/default.nix
index 59dfa4d632dd..d7b48ee4dd7f 100644
--- a/pkgs/development/python-modules/textual/default.nix
+++ b/pkgs/development/python-modules/textual/default.nix
@@ -37,14 +37,14 @@
 
 buildPythonPackage rec {
   pname = "textual";
-  version = "8.2.4";
+  version = "8.2.5";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "Textualize";
     repo = "textual";
     tag = "v${version}";
-    hash = "sha256-827cm9pcj1o1FYeaoWKCJ6dEyXeDop4kYd205cySTfg=";
+    hash = "sha256-bQnyTnoG/3Lcrn9cHwNHUYw6piOg8U9bAoPfZW7SDmQ=";
   };
 
   build-system = [ poetry-core ];