diff --git a/Dist/deps.nix b/Dist/deps.nix
index 253ce229bb..60dcf9576d 100644
--- a/Dist/deps.nix
+++ b/Dist/deps.nix
@@ -55,7 +55,7 @@
   (fetchNuGet { name = "System.Collections"; version = "4.0.11"; sha256 = "1ga40f5lrwldiyw6vy67d0sg7jd7ww6kgwbksm19wrvq9hr0bsm6"; })
   (fetchNuGet { name = "System.Collections"; version = "4.3.0"; sha256 = "19r4y64dqyrq6k4706dnyhhw7fs24kpp3awak7whzss39dakpxk9"; })
   (fetchNuGet { name = "System.Collections.Concurrent"; version = "4.3.0"; sha256 = "0wi10md9aq33jrkh2c24wr2n9hrpyamsdhsxdcnf43b7y86kkii8"; })
-  (fetchNuGet { name = "System.Collections.Immutable"; version = "6.0.0"; sha256 = "1js98kmjn47ivcvkjqdmyipzknb9xbndssczm8gq224pbaj1p88c"; })
+  (fetchNuGet { name = "System.Collections.Immutable"; version = "5.0.0"; sha256 = "1kvcllagxz2q92g81zkz81djkn2lid25ayjfgjalncyc68i15p0r"; })
   (fetchNuGet { name = "System.ComponentModel.Annotations"; version = "5.0.0"; sha256 = "021h7x98lblq9avm1bgpa4i31c2kgsa7zn4sqhxf39g087ar756j"; })
   (fetchNuGet { name = "System.Console"; version = "4.3.0"; sha256 = "1flr7a9x920mr5cjsqmsy9wgnv3lvd0h1g521pdr1lkb2qycy7ay"; })
   (fetchNuGet { name = "System.Diagnostics.Debug"; version = "4.0.11"; sha256 = "0gmjghrqmlgzxivd2xl50ncbglb7ljzb66rlx8ws6dv8jm0d5siz"; })
@@ -118,7 +118,6 @@
   (fetchNuGet { name = "System.Runtime"; version = "4.3.0"; sha256 = "066ixvgbf2c929kgknshcxqj6539ax7b9m570cp8n179cpfkapz7"; })
   (fetchNuGet { name = "System.Runtime.CompilerServices.Unsafe"; version = "4.5.3"; sha256 = "1afi6s2r1mh1kygbjmfba6l4f87pi5sg13p4a48idqafli94qxln"; })
   (fetchNuGet { name = "System.Runtime.CompilerServices.Unsafe"; version = "4.7.1"; sha256 = "119br3pd85lq8zcgh4f60jzmv1g976q1kdgi3hvqdlhfbw6siz2j"; })
-  (fetchNuGet { name = "System.Runtime.CompilerServices.Unsafe"; version = "6.0.0"; sha256 = "0qm741kh4rh57wky16sq4m0v05fxmkjjr87krycf5vp9f0zbahbc"; })
   (fetchNuGet { name = "System.Runtime.Extensions"; version = "4.1.0"; sha256 = "0rw4rm4vsm3h3szxp9iijc3ksyviwsv6f63dng3vhqyg4vjdkc2z"; })
   (fetchNuGet { name = "System.Runtime.Extensions"; version = "4.3.0"; sha256 = "1ykp3dnhwvm48nap8q23893hagf665k0kn3cbgsqpwzbijdcgc60"; })
   (fetchNuGet { name = "System.Runtime.Handles"; version = "4.0.1"; sha256 = "1g0zrdi5508v49pfm3iii2hn6nm00bgvfpjq1zxknfjrxxa20r4g"; })