diff --git a/src/aut_groups/mcg.jl b/src/aut_groups/mcg.jl
index 8b3bbce..0bb17b2 100644
--- a/src/aut_groups/mcg.jl
+++ b/src/aut_groups/mcg.jl
@@ -74,7 +74,7 @@ relations(S::SurfaceGroup) = S.relations
 function symplectic_twists(π₁Σ::SurfaceGroup)
     g = genus(π₁Σ)
 
-    saut = SpecialAutomorphismGroup(FreeGroup(2g), maxrules=100)
+    saut = SpecialAutomorphismGroup(FreeGroup(2g), max_rules=1000)
 
     Aij  = [SymplecticMappingClass(saut, :A, i, j) for i in 1:g for j in 1:g if i≠j]
 
diff --git a/src/aut_groups/sautFn.jl b/src/aut_groups/sautFn.jl
index 19e5f45..4f8c609 100644
--- a/src/aut_groups/sautFn.jl
+++ b/src/aut_groups/sautFn.jl
@@ -7,12 +7,12 @@ function SpecialAutomorphismGroup(F::FreeGroup; ordering = KnuthBendix.LenLex, k
     A, rels = gersten_relations(n, commutative=false)
     S = [A[i] for i in 1:2:length(A)]
 
-    maxrules = 1000*n
+    max_rules = 1000 * n
 
-    rws = KnuthBendix.RewritingSystem(rels, ordering(A))
-    Logging.with_logger(Logging.NullLogger()) do
+    rws = Logging.with_logger(Logging.NullLogger()) do
+        rws = KnuthBendix.RewritingSystem(rels, ordering(A))
         # the rws is not confluent, let's suppress warning about it
-        KnuthBendix.knuthbendix!(rws; maxrules=maxrules, kwargs...)
+        KnuthBendix.knuthbendix(rws, KnuthBendix.Settings(; max_rules=max_rules, kwargs...))
     end
     return AutomorphismGroup(F, S, rws, ntuple(i -> gens(F, i), n))
 end
diff --git a/src/types.jl b/src/types.jl
index f20b55a..cb50fe0 100644
--- a/src/types.jl
+++ b/src/types.jl
@@ -229,7 +229,7 @@ function FPGroup(
     word_rels = [word(lhs) => word(rhs) for (lhs, rhs) in [relations(G); rels]]
     rws = KnuthBendix.RewritingSystem(word_rels, ordering)
 
-    KnuthBendix.knuthbendix!(rws; kwargs...)
+    rws = KnuthBendix.knuthbendix(rws, KnuthBendix.Settings(; kwargs...))
 
     return FPGroup(G.gens, rels, rws)
 end
diff --git a/test/AutFn.jl b/test/AutFn.jl
index 8c566ea..0df66e8 100644
--- a/test/AutFn.jl
+++ b/test/AutFn.jl
@@ -79,7 +79,7 @@
         @test inv(l)(deepcopy(D)) == (a, d^-1*b,c, d)
     end
 
-    A = SpecialAutomorphismGroup(F4, maxrules=1000)
+    A = SpecialAutomorphismGroup(F4, max_rules=1000)
 
     @testset "AutomorphismGroup constructors" begin
         @test A isa Groups.AbstractFPGroup
diff --git a/test/fp_groups.jl b/test/fp_groups.jl
index e06f165..f46b544 100644
--- a/test/fp_groups.jl
+++ b/test/fp_groups.jl
@@ -40,7 +40,7 @@
     end
 
     # quotient of G
-    H = FPGroup(G, [aG^2=>cG, bG*cG=>aG], maxrules=200)
+    H = FPGroup(G, [aG^2 => cG, bG * cG => aG], max_rules=200)
 
     h = H(word(g))
 
@@ -48,7 +48,7 @@
     @test_throws AssertionError h == g
     @test_throws MethodError h*g
 
-    H′ = FPGroup(G, [aG^2=>cG, bG*cG=>aG], maxrules=200)
+    H′ = FPGroup(G, [aG^2 => cG, bG * cG => aG], max_rules=200)
     @test_throws AssertionError one(H) == one(H′)
 
     Groups.normalform!(h)