diff --git a/pkgs/development/compilers/julia/1.0.nix b/pkgs/development/compilers/julia/1.0.nix
index 4f05329f595a..28500815639a 100644
--- a/pkgs/development/compilers/julia/1.0.nix
+++ b/pkgs/development/compilers/julia/1.0.nix
@@ -1,6 +1,6 @@
 { lib, stdenv, fetchpatch, fetchurl, fetchzip
 # build tools
-, gfortran, m4, makeWrapper, patchelf, perl, which, python2
+, gfortran, m4, makeWrapper, patchelf, perl, which, python3
 , cmake
 # libjulia dependencies
 , libunwind, readline, utf8proc, zlib
@@ -74,7 +74,7 @@ stdenv.mkDerivation rec {
     sha256 = src_sha256;
   };
 
-  nativeBuildInputs = [ cmake curl gfortran m4 makeWrapper patchelf perl python2 which ];
+  nativeBuildInputs = [ cmake curl gfortran m4 makeWrapper patchelf perl python3 which ];
   # cmake is only used to build the bundled deps
   dontUseCmakeConfigure = true;
 
diff --git a/pkgs/development/compilers/julia/1.5.nix b/pkgs/development/compilers/julia/1.5.nix
index 06c0e2a30e8c..3421af681a25 100644
--- a/pkgs/development/compilers/julia/1.5.nix
+++ b/pkgs/development/compilers/julia/1.5.nix
@@ -1,6 +1,6 @@
 { lib, stdenv, fetchzip
 # build tools
-, gfortran, m4, makeWrapper, patchelf, perl, which, python2, cmake
+, gfortran, m4, makeWrapper, patchelf, perl, which, python3, cmake
 # libjulia dependencies
 , libunwind, readline, utf8proc, zlib
 # standard library dependencies
@@ -48,7 +48,7 @@ stdenv.mkDerivation rec {
     zlib
   ] ++ lib.optionals stdenv.isDarwin [CoreServices ApplicationServices];
 
-  nativeBuildInputs = [ curl gfortran m4 makeWrapper patchelf perl python2 which cmake ];
+  nativeBuildInputs = [ curl gfortran m4 makeWrapper patchelf perl python3 which cmake ];
 
   makeFlags =
     let