diff --git a/test/outputs.jl b/test/outputs.jl
index 9b13bb0..73b9207 100644
--- a/test/outputs.jl
+++ b/test/outputs.jl
@@ -45,7 +45,7 @@ end
     TargetedEstimation.initialize_json(jsonoutput.filename)
     TargetedEstimation.update_file(jsonoutput, results[1:3])
     TargetedEstimation.update_file(jsonoutput, results[4:end]; finalize=true)
-    loaded_results = TMLE.read_json(jsonoutput.filename)
+    loaded_results = TMLE.read_json(jsonoutput.filename, use_mmap=false)
     @test size(loaded_results) == size(results)
     for (result, loaded_result) in zip(results, loaded_results)
         @test result.TMLE.estimate == loaded_result[:TMLE].estimate
diff --git a/test/runner.jl b/test/runner.jl
index 88b01da..1985f35 100644
--- a/test/runner.jl
+++ b/test/runner.jl
@@ -44,7 +44,7 @@ include(joinpath(TESTDIR, "testutils.jl"))
     TargetedEstimation.save(runner, results, partition, true)
 
     # Test Save to JSON
-    loaded_results = TMLE.read_json(outputs.json.filename)
+    loaded_results = TMLE.read_json(outputs.json.filename, use_mmap=false)
     for (result, loaded_result) in zip(results, loaded_results)
         @test loaded_result[:TMLE] isa TMLE.TMLEstimate
         @test result.TMLE.estimate == loaded_result[:TMLE].estimate
@@ -134,7 +134,7 @@ end
                 end
             end
             results_from_hdf5 = vcat(results_from_hdf5...)
-            results_from_json = TMLE.read_json(outputs.json.filename)
+            results_from_json = TMLE.read_json(outputs.json.filename, use_mmap=false)
 
             for i in 1:6
                 Ψ = configuration.estimands[i]
@@ -171,7 +171,7 @@ end
     )
     
     # Essential results
-    results_from_json = TMLE.read_json("output.json")
+    results_from_json = TMLE.read_json("output.json", use_mmap=false)
     n_IC_empties = 0
     for result in results_from_json
         if result[:OSE].IC != []
@@ -210,7 +210,7 @@ end
     ])
 
     # Check results from JSON
-    results_from_json = TMLE.read_json(outputs.json.filename)
+    results_from_json = TMLE.read_json(outputs.json.filename, use_mmap=false)
     for estimator in (:OSE, :TMLE)
         @test results_from_json[1][estimator][:error] == "Could not fit the following propensity score model: P₀(T2 | W1, W2)"
         @test results_from_json[1][estimator][:estimand] isa TMLE.Estimand
@@ -282,7 +282,7 @@ end
     @test results[3].OSE isa TMLE.ComposedEstimate
     
     # JSON Output
-    results_from_json = TMLE.read_json("output.json")
+    results_from_json = TMLE.read_json("output.json", use_mmap=false)
     @test length(results_from_json) == 3
 
     # HDF5
diff --git a/test/summary.jl b/test/summary.jl
index a75d0e1..40f3a73 100644
--- a/test/summary.jl
+++ b/test/summary.jl
@@ -55,7 +55,7 @@ include(joinpath(TESTDIR, "testutils.jl"))
     hdf5file_2 = jldopen("tmle_output_2.hdf5")
     inputs = vcat(hdf5file_1["Batch_1"], hdf5file_1["Batch_2"], hdf5file_2["Batch_1"])
 
-    json_outputs = TMLE.read_json("summary.json")
+    json_outputs = TMLE.read_json("summary.json", use_mmap=false)
     jls_outputs = []
     open("summary.jls") do io
         while !eof(io)