diff --git a/pkgs/by-name/tr/tree-sitter/grammars/grammar-sources.nix b/pkgs/by-name/tr/tree-sitter/grammars/grammar-sources.nix
index b4e4c2e39960..9b77c61f9966 100644
--- a/pkgs/by-name/tr/tree-sitter/grammars/grammar-sources.nix
+++ b/pkgs/by-name/tr/tree-sitter/grammars/grammar-sources.nix
@@ -2300,9 +2300,13 @@
   };
 
   regex = {
-    version = "1.0.0";
+    # Note: if you see an attempt to update tree-sitter-regex to version 1.0.0,
+    # check if https://github.com/tree-sitter/tree-sitter-regex/tags is actually
+    # a recent version. After v1.0.0, tree-sitter-regex confusingly released
+    # v0.20.0, v0.21.0, etc.
+    version = "0.25.0";
     url = "github:tree-sitter/tree-sitter-regex";
-    hash = "sha256-3D+LOWRUamAdbegVfWD5yFcCjBucthPogOL/zWR78PY=";
+    hash = "sha256-bR0K6SR19QuQwDUic+CJ69VQTSGqry5a5IOpPTVJFlo=";
     meta = {
       license = lib.licenses.mit;
     };