diff --git a/src/constraints.jl b/src/constraints.jl
index 57d87434..93ac4581 100644
--- a/src/constraints.jl
+++ b/src/constraints.jl
@@ -62,7 +62,7 @@ function __constraint!(
     codim_f::Union{Dimension,Nothing}=nothing,
 )
 
-    # checkings: the constraint must not be set before
+    # checks: the constraint must not be set before
     @ensure(
         !(label ∈ keys(ocp_constraints)),
         CTBase.UnauthorizedCall(
@@ -70,7 +70,7 @@ function __constraint!(
         ),
     )
 
-    # checkings: lb and ub cannot be both nothing
+    # checks: lb and ub cannot be both nothing
     @ensure(
         !(isnothing(lb) && isnothing(ub)),
         CTBase.UnauthorizedCall(
@@ -217,7 +217,7 @@ function constraint!(
     codim_f::Union{Dimension,Nothing}=nothing,
 )
 
-    # checkings: times, state and control must be set before adding constraints
+    # checks: times, state and control must be set before adding constraints
     @ensure __is_state_set(ocp) CTBase.UnauthorizedCall(
         "the state must be set before adding constraints."
     )
@@ -228,7 +228,7 @@ function constraint!(
         "the times must be set before adding constraints."
     )
 
-    # checkings: variable must be set if using type=:variable
+    # checks: variable must be set if using type=:variable
     @ensure (type != :variable || __is_variable_set(ocp)) CTBase.UnauthorizedCall(
         "the ocp has no variable, you cannot use constraint! function with type=:variable. If it is a mistake, please set the variable first.",
     )
diff --git a/src/control.jl b/src/control.jl
index fa90e168..864f26c2 100644
--- a/src/control.jl
+++ b/src/control.jl
@@ -46,7 +46,7 @@ function control!(
     components_names::Vector{T2}=__control_components(m, string(name)),
 )::Nothing where {T1<:Union{String,Symbol},T2<:Union{String,Symbol}}
 
-    # checkings using @ensure
+    # checks using @ensure
     @ensure !__is_control_set(ocp) CTBase.UnauthorizedCall(
         "the control has already been set."
     )
diff --git a/src/objective.jl b/src/objective.jl
index d330def1..a884490b 100644
--- a/src/objective.jl
+++ b/src/objective.jl
@@ -35,7 +35,7 @@ function objective!(
     lagrange::Union{Function,Nothing}=nothing,
 )::Nothing
 
-    # checkings: times, state, and control must be set before the objective
+    # checks: times, state, and control must be set before the objective
     @ensure __is_state_set(ocp) CTBase.UnauthorizedCall(
         "the state must be set before the objective."
     )
@@ -46,12 +46,12 @@ function objective!(
         "the times must be set before the objective."
     )
 
-    # checkings: the objective must not already be set
+    # checks: the objective must not already be set
     @ensure !__is_objective_set(ocp) CTBase.UnauthorizedCall(
         "the objective has already been set."
     )
 
-    # checkings: at least one of the two functions must be given
+    # checks: at least one of the two functions must be given
     @ensure !(isnothing(mayer) && isnothing(lagrange)) CTBase.IncorrectArgument(
         "at least one of the two functions must be given. Please provide a Mayer or a Lagrange function.",
     )
diff --git a/src/state.jl b/src/state.jl
index 9dec903a..18682d3a 100644
--- a/src/state.jl
+++ b/src/state.jl
@@ -60,7 +60,7 @@ function state!(
     components_names::Vector{T2}=__state_components(n, string(name)),
 )::Nothing where {T1<:Union{String,Symbol},T2<:Union{String,Symbol}}
 
-    # checkings
+    # checks
     @ensure !__is_state_set(ocp) CTBase.UnauthorizedCall("the state has already been set.")
     @ensure n > 0 CTBase.IncorrectArgument("the state dimension must be greater than 0")
     @ensure size(components_names, 1) == n CTBase.IncorrectArgument(
diff --git a/test/Project.toml b/test/Project.toml
index ca62c987..2b721821 100644
--- a/test/Project.toml
+++ b/test/Project.toml
@@ -18,7 +18,7 @@ CTDirect = "0.16"
 CTParser = "0.6"
 JLD2 = "0.6"
 JSON3 = "1"
-NLPModelsIpopt = "0.10"
+NLPModelsIpopt = "0.11"
 Plots = "1"
 Test = "1"
 julia = "1.10"
diff --git a/test/test_control.jl b/test/test_control.jl
index 28e338ba..62c8a2cf 100644
--- a/test/test_control.jl
+++ b/test/test_control.jl
@@ -9,7 +9,7 @@ function test_control()
     @test CTModels.name(control) == "u"
     @test CTModels.components(control) == ["u₁", "u₂"]
 
-    # some checkings
+    # some checks
     ocp = CTModels.PreModel()
     @test isnothing(ocp.control)
     @test !CTModels.__is_control_set(ocp)
diff --git a/test/test_state.jl b/test/test_state.jl
index 00c710e0..da68a3c5 100644
--- a/test/test_state.jl
+++ b/test/test_state.jl
@@ -9,7 +9,7 @@ function test_state()
     @test CTModels.name(state) == "y"
     @test CTModels.components(state) == ["u", "v"]
 
-    # some checkings
+    # some checks
     ocp = CTModels.PreModel()
     @test isnothing(ocp.state)
     @test !CTModels.__is_state_set(ocp)
diff --git a/test/test_times.jl b/test/test_times.jl
index 29a51030..b1b5d6de 100644
--- a/test/test_times.jl
+++ b/test/test_times.jl
@@ -15,7 +15,7 @@ function test_times()
     @test CTModels.name(time) == "s"
     @test_throws CTBase.IncorrectArgument CTModels.time(time, Float64[])
 
-    # some checkings
+    # some checks
     ocp = CTModels.PreModel()
     @test isnothing(ocp.times)
     @test !CTModels.__is_times_set(ocp)
diff --git a/test/test_variable.jl b/test/test_variable.jl
index 3b204773..2ffa86f1 100644
--- a/test/test_variable.jl
+++ b/test/test_variable.jl
@@ -9,7 +9,7 @@ function test_variable()
     @test CTModels.name(variable) == "v"
     @test CTModels.components(variable) == ["v₁", "v₂"]
 
-    # some checkings
+    # some checks
     ocp = CTModels.PreModel()
     @test ocp.variable isa CTModels.EmptyVariableModel
     @test !CTModels.__is_variable_set(ocp)