diff --git a/REQUIRE b/REQUIRE
index d4e0ff34890cfa377997fe8d4a80ccfd8f5048a9..22417eb15471a191cb7bba97ba8262d0429250fa 100644
--- a/REQUIRE
+++ b/REQUIRE
@@ -1,5 +1,6 @@
-julia 0.6-
+julia 1.0-
 Calculus
 NLsolve
 Suppressor
 BinaryProvider
+SpecialFunctions
\ No newline at end of file
diff --git a/src/Utils.jl b/src/Utils.jl
index 6fd7eff5316a3f97410331793983eed1a5404f6b..d2c9e6f2673704a80afcdd6acca908bfdcf86242 100644
--- a/src/Utils.jl
+++ b/src/Utils.jl
@@ -1,6 +1,6 @@
 module Utils
 ##
- # Copyright (C) 2015 Dynare Team
+ # Copyright © 2015-2019 Dynare Team
  #
  # This file is part of Dynare.
  #
@@ -18,6 +18,10 @@ module Utils
  # along with Dynare.  If not, see <http://www.gnu.org/licenses/>.
 ##
 
+import Base: @irrational
+@irrational sqrt2     1.4142135623730950488 sqrt(big(2.0))
+@irrational invsqrt2  0.7071067811865475244 inv(big(sqrt2))
+
 export get_power_deriv
 
 function get_power_deriv(x::Float64, p::Real, k::Int)
@@ -33,4 +37,16 @@ function get_power_deriv(x::Float64, p::Real, k::Int)
     return dxp
 end
 
+
+using SpecialFunctions
+
+export normcdf
+
+normcdf(z::Number) = erfc(-z * invsqrt2)/2
+
+function normcdf(x::Number, μ::Real, σ::Real)
+    z = (x - μ) / σ
+    normcdf(z)
+end
+
 end