diff --git a/Project.toml b/Project.toml
index 33751d7..4d7e5b5 100644
--- a/Project.toml
+++ b/Project.toml
@@ -7,7 +7,6 @@ version = "0.1.3"
 BoundaryValueDiffEq = "764a87c0-6b3e-53db-9096-fe964310641d"
 Convex = "f65535da-76fb-5f13-bab9-19810c17039a"
 DelimitedFiles = "8bb1440f-4735-579b-a4ab-409b98df4dab"
-DifferentialEquations = "0c46a032-eb83-5123-abaf-570d42b7fbaa"
 Distributions = "31c24e10-a181-5473-b8eb-7969acd0382f"
 Flux = "587475ba-b771-5e3f-ad9e-33799f191a9c"
 Interpolations = "a98d9a8b-a2ab-59e6-89dd-64a1c18fca59"
@@ -27,7 +26,6 @@ Zygote = "e88e6eb3-aa80-5325-afca-941959d7151f"
 [compat]
 BoundaryValueDiffEq = "2"
 Convex = "0.14, 0.15"
-DifferentialEquations = "7"
 Distributions = "0.25"
 Flux = "0.12, 0.14"
 Interpolations = "0.13, 0.15"
@@ -39,7 +37,7 @@ StableRNGs = "1"
 StatsBase = "0.33"
 Trapz = "2"
 Zygote = "0.6"
-julia = "≥1.7"
+julia = "1.7"
 
 [extras]
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
diff --git a/src/QuanEstimation.jl b/src/QuanEstimation.jl
index 0531c5c..bb39031 100644
--- a/src/QuanEstimation.jl
+++ b/src/QuanEstimation.jl
@@ -14,7 +14,7 @@ using Trapz
 using Interpolations
 using Distributions
 using QuadGK
-using DifferentialEquations
+using OrdinaryDiffEq
 
 const pkgpath = @__DIR__