diff --git a/Cargo.toml b/Cargo.toml
index 019f9ce15f532060f37870753805a9b57503077b..16c04bc07f5efb7213c9881c4892918af975bf74 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,9 +7,13 @@ homepage = "https://conduit.rs"
 repository = "https://gitlab.com/famedly/conduit"
 readme = "README.md"
 version = "0.6.0-alpha"
-rust-version = "1.64"
 edition = "2021"
 
+# When changing this, change the hash near the text "THE rust-version HASH" in
+# `/flake.nix` too. If you don't have Nix installed or otherwise don't know how
+# to do this, ping `@charles:computer.surgery` in the matrix room.
+rust-version = "1.64"
+
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
diff --git a/flake.lock b/flake.lock
index 9217ff26ec7d359a316e811204104b96715b665d..bfe0a9bcb09b749ce8d6e7dc01ebd60f78ef2641 100644
--- a/flake.lock
+++ b/flake.lock
@@ -8,11 +8,11 @@
         "rust-analyzer-src": "rust-analyzer-src"
       },
       "locked": {
-        "lastModified": 1665815894,
-        "narHash": "sha256-Vboo1L4NMGLKZKVLnOPi9OHlae7uoNyfgvyIUm+SVXE=",
+        "lastModified": 1671776618,
+        "narHash": "sha256-myjhExbKIzZy+kqqFyqvX59KErqYZVNTPsCfgByTOKo=",
         "owner": "nix-community",
         "repo": "fenix",
-        "rev": "2348450241a5f945f0ba07e44ecbfac2f541d7f4",
+        "rev": "64d1607710b99e72d9afb2cde11bd1c2cea7cb91",
         "type": "github"
       },
       "original": {
@@ -23,11 +23,11 @@
     },
     "flake-utils": {
       "locked": {
-        "lastModified": 1659877975,
-        "narHash": "sha256-zllb8aq3YO3h8B/U0/J1WBgAL8EX5yWf5pMj3G0NAmc=",
+        "lastModified": 1667395993,
+        "narHash": "sha256-nuEHfE/LcWyuSWnS8t12N1wc105Qtau+/OdUAjtQ0rA=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "c0e246b9b83f637f4681389ecabcb2681b4f3af0",
+        "rev": "5aed5285a952e0b949eb3ba02c12fa4fcfef535f",
         "type": "github"
       },
       "original": {
@@ -43,11 +43,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1662220400,
-        "narHash": "sha256-9o2OGQqu4xyLZP9K6kNe1pTHnyPz0Wr3raGYnr9AIgY=",
+        "lastModified": 1671096816,
+        "narHash": "sha256-ezQCsNgmpUHdZANDCILm3RvtO1xH8uujk/+EqNvzIOg=",
         "owner": "nix-community",
         "repo": "naersk",
-        "rev": "6944160c19cb591eb85bbf9b2f2768a935623ed3",
+        "rev": "d998160d6a076cfe8f9741e56aeec7e267e3e114",
         "type": "github"
       },
       "original": {
@@ -58,11 +58,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1665856037,
-        "narHash": "sha256-/RvIWnGKdTSoIq5Xc2HwPIL0TzRslzU6Rqk4Img6UNg=",
+        "lastModified": 1671780662,
+        "narHash": "sha256-Tsc64sN8LLHa7eqDZVVeubI8CyqIjs9l5tQ5EeRlgvM=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "c95ebc5125ffffcd431df0ad8620f0926b8125b8",
+        "rev": "339063a22409514cb2baea677b329e618faa6a08",
         "type": "github"
       },
       "original": {
@@ -82,11 +82,11 @@
     "rust-analyzer-src": {
       "flake": false,
       "locked": {
-        "lastModified": 1665765556,
-        "narHash": "sha256-w9L5j0TIB5ay4aRwzGCp8mgvGsu5dVJQvbEFutwr6xE=",
+        "lastModified": 1671750139,
+        "narHash": "sha256-xbL8BZU87rHfQkF3tuFXduNGPW8fDwFI+0fFmRJx66E=",
         "owner": "rust-lang",
         "repo": "rust-analyzer",
-        "rev": "018b8429cf3fa9d8aed916704e41dfedeb0f4f78",
+        "rev": "a06525517b0b69cd97f2c39a4012d96f44bf0776",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index 924300cfb325900fd4b40858e19eed59cc46c3fe..e10e8bbbb1994741ede241973989e8ef28c7a67b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -32,9 +32,8 @@
         # Use the Rust version defined in `Cargo.toml`
         channel = cargoToml.package.rust-version;
 
-        # This will need to be updated when `package.rust-version` is changed in
-        # `Cargo.toml`
-        sha256 = "sha256-KXx+ID0y4mg2B3LHp7IyaiMrdexF6octADnAtFIOjrY=";
+        # THE rust-version HASH
+        sha256 = "sha256-8len3i8oTwJSOJZMosGGXHBL5BVuGQnWOT2St5YAUFU=";
       };
 
       builder = (pkgs.callPackage naersk {