diff --git a/default.nix b/default.nix
index bcbba47ce4f0..788392f0865c 100644
--- a/default.nix
+++ b/default.nix
@@ -41,7 +41,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [
     hostname
-    python3
+    python311
     # coq-makefile timing tools
     time
     dune_3
@@ -54,10 +54,10 @@ stdenv.mkDerivation rec {
   ]
   ++ optionals buildDoc [
     # Sphinx doc dependencies
-    pkg-config (python3.withPackages
+    pkg-config (python311.withPackages
       (ps: [ ps.sphinx ps.sphinx_rtd_theme ps.pexpect ps.beautifulsoup4
-             ps.antlr4-python3-runtime ps.sphinxcontrib-bibtex ]))
-    antlr4
+             (ps.antlr4-python3-runtime.override {antlr4 = pkgs.antlr4_9;}) ps.sphinxcontrib-bibtex ]))
+    antlr4_9
     ocamlPackages.odoc
   ]
   ++ optionals doInstallCheck [
diff --git a/dev/nixpkgs.nix b/dev/nixpkgs.nix
index 7e9abd92ff19..346b3a61e298 100644
--- a/dev/nixpkgs.nix
+++ b/dev/nixpkgs.nix
@@ -1,4 +1,4 @@
 import (fetchTarball {
-  url = "https://github.com/NixOS/nixpkgs/archive/5b9b93b9be4234aaf9cd53e3247a927225095514.tar.gz";
-  sha256 = "0wz4xr43rg1p2sqgi6zg3s02jfaxhl15slz747fh6h825i4cz9bb";
+  url = "https://github.com/NixOS/nixpkgs/archive/a565059a348422af5af9026b5174dc5c0dcefdae.tar.gz";
+  sha256 = "1spgz981x8p2ix9nsrkfw7a4n5wx35mf4v0bsjqfpjy360jb5rix";
 })
diff --git a/doc/README.md b/doc/README.md
index 2e3355492c3b..ba0365393883 100644
--- a/doc/README.md
+++ b/doc/README.md
@@ -33,7 +33,7 @@ reference manual requires Python 3, and the following Python packages:
   - sphinx >= 4.5.0
   - sphinx_rtd_theme >= 1.0.0
   - beautifulsoup4 >= 4.0.6
-  - antlr4-python3-runtime >= 4.7.1
+  - antlr4-python3-runtime >= 4.7.1 & <= 4.9.3
   - pexpect >= 4.2.1
   - sphinxcontrib-bibtex >= 0.4.2