diff --git a/custom_mutators/grammar_mutator/GRAMMAR_VERSION b/custom_mutators/grammar_mutator/GRAMMAR_VERSION
index 87f607cd..4743e7c2 100644
--- a/custom_mutators/grammar_mutator/GRAMMAR_VERSION
+++ b/custom_mutators/grammar_mutator/GRAMMAR_VERSION
@@ -1 +1 @@
-eedf07d
+6ca490c
diff --git a/custom_mutators/grammar_mutator/grammar_mutator b/custom_mutators/grammar_mutator/grammar_mutator
index b79d51a8..6ca490c6 160000
--- a/custom_mutators/grammar_mutator/grammar_mutator
+++ b/custom_mutators/grammar_mutator/grammar_mutator
@@ -1 +1 @@
-Subproject commit b79d51a8daccbd7a693f9b6765c81ead14f28e26
+Subproject commit 6ca490c66b949db20d8c861ebc8fb2e6ca725ead