diff --git a/Project.toml b/Project.toml
index 9fbb324..dfce8b4 100644
--- a/Project.toml
+++ b/Project.toml
@@ -2,7 +2,7 @@ name = "FractionalCalculus"
 uuid = "638fb199-4bb2-4014-80c8-6dc0d90f156b"
 license = "MIT"
 authors = ["Qingyu Qu <erikqqy123@gmail.com>"]
-version = "0.2.4"
+version = "0.2.5"
 
 [deps]
 InvertedIndices = "41ab1584-1d38-5bbf-9106-f11c6c58b48f"
diff --git a/src/Derivative/Caputo.jl b/src/Derivative/Caputo.jl
index e8542ed..3c25e94 100644
--- a/src/Derivative/Caputo.jl
+++ b/src/Derivative/Caputo.jl
@@ -231,7 +231,7 @@ function W₅(i, n, m, α)
     end
 end
 # Deploy Complex Step Differentiation to compute the first order derivative.
-function first_order(f, point, h)
+function first_order(f, point, h::Float64)
     return imag(f(point + im*h))/h
 end
 
@@ -282,7 +282,7 @@ function fracdiff(y, α, t, p, ::Caputo_High_Precision)
     t = t[:]
     n = length(t)
     y = y.(t)
-    q = Int64(ceil(α))
+    q = ceil(Int, α)
     r = Int64(max(p, q))
     R = reverse(Vandermonde(collect(0:(r-1)).*h))
     c = inv(R)*y[1:r]