diff --git a/nix/frama-ci.nix b/nix/frama-ci.nix
index b022dab5948f5ff9a43553e57cc0ff13663d796a..253aa3a7ad72aa528e17649174e094d0cf561127 100644
--- a/nix/frama-ci.nix
+++ b/nix/frama-ci.nix
@@ -5,7 +5,7 @@ let
     src = builtins.fetchGit {
             "url" = "https://bobot:${password}@git.frama-c.com/frama-c/Frama-CI.git";
             "name" = "Frama-CI";
-            "rev" = "79089bda56f3398fabd5269d7270f1330326de99";
+            "rev" = "85ba4a2c716d3f992f75bd838463a36b86cf7ccb";
             "ref" = "feature/ci/update-opam";
     };
  in
diff --git a/nix/frama-ci.sh b/nix/frama-ci.sh
index b331b057a8e8ec372a541e94d2af935a95b94f2a..dbbe1bb07e4976298cd85cb0a96675ab78d5ac56 100755
--- a/nix/frama-ci.sh
+++ b/nix/frama-ci.sh
@@ -4,7 +4,7 @@ DIR=$(dirname $0)
 
 export FRAMA_CI_NIX=$DIR/frama-ci.nix
 
-export FRAMA_CI=$(nix-instantiate --eval -E "((import <nixos-19.03> {}).callPackage $FRAMA_CI_NIX  { password = \"$TOKEN_FOR_API\";}).src.outPath")
+export FRAMA_CI=$(nix-instantiate --eval -E "((import <nixos-20.03> {}).callPackage $FRAMA_CI_NIX  { password = \"$TOKEN_FOR_API\";}).src.outPath")
 
 FRAMA_CI=${FRAMA_CI#\"}
 FRAMA_CI=${FRAMA_CI%\"}