diff --git a/iJulia/Gas-Catalyst Interface.ipynb b/iJulia/Gas-Catalyst Interface.ipynb
index 91282687..c07cfad2 100644
--- a/iJulia/Gas-Catalyst Interface.ipynb	
+++ b/iJulia/Gas-Catalyst Interface.ipynb	
@@ -102,7 +102,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "sol.retcode == :Success"
+    "sol.retcode == SciMLBase.Success"
    ]
   },
   {
diff --git a/src/EdgeAnalysis.jl b/src/EdgeAnalysis.jl
index 9256679e..9029cfe7 100644
--- a/src/EdgeAnalysis.jl
+++ b/src/EdgeAnalysis.jl
@@ -987,7 +987,7 @@ function selectobjects(react,edgereact,coreedgedomains,coreedgeinters,domains,in
     invalidobjects = []
     terminated = false
     conversion = 0.0
-    code = :Success
+    code = SciMLBase.Success
 
     if tolbranchrxntocore != 0.0
         branchfactor = 1.0/tolbranchrxntocore
@@ -1006,7 +1006,7 @@ function selectobjects(react,edgereact,coreedgedomains,coreedgeinters,domains,in
     firsttime = true
 
     nsteps = 0
-    while t < tf && Symbol(code) == :Success
+    while t < tf && code == SciMLBase.Success
         step!(inte)
         nsteps += 1
         code = check_error(inte)
@@ -1028,7 +1028,7 @@ function selectobjects(react,edgereact,coreedgedomains,coreedgeinters,domains,in
         end
     end
 
-    if Symbol(code) == :Success
+    if code == SciMLBase.Success
         return (terminated,false,invalidobjects,unimolecularthreshold,
             bimolecularthreshold,trimolecularthreshold,maxedgespeciesrateratios,t,conversion)
     else
diff --git a/src/Simulation.jl b/src/Simulation.jl
index 025819e2..3b800eb8 100644
--- a/src/Simulation.jl
+++ b/src/Simulation.jl
@@ -66,7 +66,7 @@ function Simulation(sol::Q, domain::W, reducedmodelmappings::ReducedModelMapping
 
     u = [unlumpsol(t) for t in sol.t]
     t = sol.t
-    sol = SciMLBase.build_solution(sol.prob, sol.alg, t, u, retcode=:Success)
+    sol = SciMLBase.build_solution(sol.prob, sol.alg, t, u, retcode=SciMLBase.Success)
 
     species_range = 1:length(getphasespecies(domain.phase))
     names = getfield.(getphasespecies(domain.phase), :name)