diff --git a/flake.lock b/flake.lock
index a6407fe9f7..05956d817e 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,11 +2,11 @@
   "nodes": {
     "flake-utils": {
       "locked": {
-        "lastModified": 1609246779,
-        "narHash": "sha256-eq6ZXE/VWo3EMC65jmIT6H/rrUc9UWOWVujkzav025k=",
+        "lastModified": 1623875721,
+        "narHash": "sha256-A8BU7bjS5GirpAUv4QA+QnJ4CceLHkcXdRp4xITDB0s=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "08c7ad4a0844adc4a7f9f5bb3beae482e789afa4",
+        "rev": "f7e004a55b120c02ecb6219596820fcd32ca8772",
         "type": "github"
       },
       "original": {
@@ -69,11 +69,11 @@
         "nixpkgs": "nixpkgs"
       },
       "locked": {
-        "lastModified": 1622809115,
-        "narHash": "sha256-0lfX3ihV+5VsOs40eSzNMUSNlmH6MRqkb+VDWaJNEzw=",
+        "lastModified": 1627913633,
+        "narHash": "sha256-vwj1fAGn3Pl9Vr/qSL+oDxuwbRzEdI3dsEg6o3xTmWg=",
         "owner": "NixOS",
         "repo": "nix",
-        "rev": "8e6ee1b9e924fbbbeb5594eb89e7a570f36ab6e1",
+        "rev": "47e96bb533f8cacc171bec9b688b134de31a48a9",
         "type": "github"
       },
       "original": {
@@ -84,11 +84,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1622593737,
-        "narHash": "sha256-9loxFJg85AbzJrSkU4pE/divZ1+zOxDy2FSjlrufCB8=",
+        "lastModified": 1624862269,
+        "narHash": "sha256-JFcsh2+7QtfKdJFoPibLFPLgIW6Ycnv8Bts9a7RYme0=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "bb8a5e54845012ed1375ffd5f317d2fdf434b20e",
+        "rev": "f77036342e2b690c61c97202bf48f2ce13acc022",
         "type": "github"
       },
       "original": {
@@ -99,11 +99,11 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1620531839,
-        "narHash": "sha256-csv2CWwRHdNO8ZgIgBmzzCVsPj77djXn3ZiDduJtjOs=",
+        "lastModified": 1628085532,
+        "narHash": "sha256-X639O/RVYRdasl+nYR80KCn5OqTNdeDfvsYECtSZVLQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "9b80b8324c837feef5a88930a8b734d30c1f9a95",
+        "rev": "f6ccdfcd2ac4f2e259d20e378737dcbd0ca7debe",
         "type": "github"
       },
       "original": {
@@ -126,11 +126,11 @@
     "temci": {
       "flake": false,
       "locked": {
-        "lastModified": 1606820516,
-        "narHash": "sha256-Ail3pv3Z+zszIDN6hmGSK+qAhOAzo9opCqHAZP5DSqo=",
+        "lastModified": 1626860219,
+        "narHash": "sha256-rFJb+M3ru2shqxpsZfiAFLFfc38dFaF7u2T88pvG14M=",
         "owner": "parttimenerd",
         "repo": "temci",
-        "rev": "2f8bc17cdbcd1589e2c056078716ee02f8f51dd9",
+        "rev": "fe4f47173a27cf75f734502fcb88d3d0a3860dca",
         "type": "github"
       },
       "original": {
diff --git a/nix/packages.nix b/nix/packages.nix
index 66909641b3..94981cf8f2 100644
--- a/nix/packages.nix
+++ b/nix/packages.nix
@@ -47,6 +47,7 @@ let
   lean4-mode = emacsPackages.melpaBuild {
     pname = "lean4-mode";
     version = "1";
+    commit = "1";
     src = ../lean4-mode;
     packageRequires = with pkgs.emacsPackages.melpaPackages; [ dash f flycheck magit-section lsp-mode s ];
     recipe = pkgs.writeText "recipe" ''
@@ -70,7 +71,7 @@ let
     src = mdBook;
     cargoDeps = drv.cargoDeps.overrideAttrs (_: {
       inherit src;
-      outputHash = "sha256-yunC62ISnWZ5ifbJPWq+TrFkajBRNYhYq+zofAOAo1U=";
+      outputHash = "sha256-GFjy0bkPql/694F3y+mDtUy526IbO3anInVKFeBxlUc=";
     });
     doCheck = false;
   });