diff --git a/flake.lock b/flake.lock
index ba24339..0df1f2e 100644
--- a/flake.lock
+++ b/flake.lock
@@ -51,11 +51,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1681932375,
-        "narHash": "sha256-tSXbYmpnKSSWpzOrs27ie8X3I0yqKA6AuCzCYNtwbCU=",
+        "lastModified": 1688392541,
+        "narHash": "sha256-lHrKvEkCPTUO+7tPfjIcb7Trk6k31rz18vkyqmkeJfY=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "3d302c67ab8647327dba84fbdb443cdbf0e82744",
+        "rev": "ea4c80b39be4c09702b0cb3b42eab59e2ba4f24b",
         "type": "github"
       },
       "original": {
@@ -103,11 +103,11 @@
         "rust-overlay": "rust-overlay"
       },
       "locked": {
-        "lastModified": 1655189312,
-        "narHash": "sha256-gpJ57OgIebUpO+7F00VltxSEy6dz2x6HeJ5BcRM8rDA=",
+        "lastModified": 1682891040,
+        "narHash": "sha256-hjajsi7lq24uYitUh4o04UJi1g0Qe6ruPL0s5DgPQMY=",
         "owner": "cargo2nix",
         "repo": "cargo2nix",
-        "rev": "c149357cc3d17f2849c73eb7a09d07a307cdcfe8",
+        "rev": "0167b39f198d72acdf009265634504fd6f5ace15",
         "type": "github"
       },
       "original": {
@@ -170,11 +170,11 @@
         "nixpkgs": "nixpkgs_3"
       },
       "locked": {
-        "lastModified": 1683230849,
-        "narHash": "sha256-PjIKxX1xIALyWD8NyDeoIZMMfsS4/w/AweAcYOcsLNs=",
+        "lastModified": 1690502632,
+        "narHash": "sha256-+k81RrxfphDUD5kekWbQ4xuZIHBEAQf67uivaQ34Afs=",
         "owner": "1Password",
         "repo": "typeshare",
-        "rev": "2687f8d86ef38c07819715a2f31a21ffc25504e4",
+        "rev": "9f74772af53759aee2f53e64478523e53083719e",
         "type": "github"
       },
       "original": {
@@ -185,11 +185,11 @@
     },
     "unstable": {
       "locked": {
-        "lastModified": 1681920287,
-        "narHash": "sha256-+/d6XQQfhhXVfqfLROJoqj3TuG38CAeoT6jO1g9r1k0=",
+        "lastModified": 1690367991,
+        "narHash": "sha256-2VwOn1l8y6+cu7zjNE8MgeGJNNz1eat1HwHrINeogFA=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "645bc49f34fa8eff95479f0345ff57e55b53437e",
+        "rev": "c9cf0708f00fbe553319258e48ca89ff9a413703",
         "type": "github"
       },
       "original": {
diff --git a/ifc/Cargo.lock b/ifc/Cargo.lock
index 2d2121a..188b9d6 100644
--- a/ifc/Cargo.lock
+++ b/ifc/Cargo.lock
@@ -11,72 +11,18 @@ dependencies = [
  "libc",
 ]
 
-[[package]]
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-version = "0.1.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0dde43e75fd43e8a1bf86103336bc699aa8d17ad1be60c76c0bdfd4828e19b78"
-dependencies = [
- "autocfg 1.1.0",
-]
-
 [[package]]
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 checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
 
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
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-dependencies = [
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- "serde",
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-[[package]]
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- "safemem 0.2.0",
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-
 [[package]]
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 checksum = "572f695136211188308f16ad2ca5c851a712c464060ae6974944458eb83880ba"
 
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-checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
-
 [[package]]
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@@ -104,37 +50,6 @@ dependencies = [
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 ]
 
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "29c39203181991a7dd4343b8005bd804e7a9a37afb8ac070e43771e8c820bbde"
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- "phf 0.11.1",
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-
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- "phf_codegen 0.11.1",
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-
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-checksum = "ddfc5b9aa5d4507acaf872de71051dfd0e309860e88966e1051e462a077aac4f"
-dependencies = [
- "bitflags",
-]
-
 [[package]]
 name = "codespan-reporting"
 version = "0.11.1"
@@ -195,46 +110,6 @@ dependencies = [
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 ]
 
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a06f77d526c1a601b7c4cdd98f54b5eaabffc14d5f2f0296febdc7f357c6d3ba"
-
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-checksum = "ee512640fe35acbfb4bb779db6f0d80704c2cacfa2e39b601ef3e3f47d1ae4c7"
-dependencies = [
- "libc",
-]
-
-[[package]]
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-checksum = "d897f394bad6a705d5f4104762e116a75639e470d80901eed05a860a95cb1904"
-
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-source = "registry+https://github.com/rust-lang/crates.io-index"
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-dependencies = [
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- "httparse",
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- "mime",
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- "traitobject",
- "typeable",
- "unicase",
- "url",
-]
-
 [[package]]
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 version = "0.1.53"
@@ -259,53 +134,15 @@ dependencies = [
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 ]
 
-[[package]]
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-dependencies = [
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- "unicode-bidi",
- "unicode-normalization",
-]
-
 [[package]]
 name = "international-fixed-calendar"
 version = "0.1.0"
 dependencies = [
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- "chrono-tz",
- "iron",
- "mustache",
- "params",
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-dependencies = [
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- "log 0.3.9",
- "mime_guess",
- "modifier",
- "num_cpus",
- "plugin",
- "typemap",
- "url",
-]
-
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-checksum = "fad582f4b9e86b6caa621cabeb0963332d92eea04729ab12892c2533951e6440"
-
 [[package]]
 name = "js-sys"
 version = "0.3.60"
@@ -315,12 +152,6 @@ dependencies = [
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 ]
 
-[[package]]
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-checksum = "a91d884b6667cd606bb5a69aa0c99ba811a115fc68915e7056ec08a46e93199a"
-
 [[package]]
 name = "libc"
 version = "0.2.139"
@@ -336,15 +167,6 @@ dependencies = [
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 ]
 
-[[package]]
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-version = "0.3.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
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-dependencies = [
- "log 0.4.17",
-]
-
 [[package]]
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 version = "0.4.17"
@@ -354,167 +176,23 @@ dependencies = [
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 ]
 
-[[package]]
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-version = "0.1.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
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-
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-dependencies = [
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-
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
-
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-dependencies = [
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-source = "registry+https://github.com/rust-lang/crates.io-index"
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 dependencies = [
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+ "autocfg",
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 ]
 
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-source = "registry+https://github.com/rust-lang/crates.io-index"
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 checksum = "578ede34cf02f8924ab9447f50c28075b4d3e5b269972345e7e0372b38c6cdcd"
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-dependencies = [
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+ "autocfg",
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@@ -523,134 +201,6 @@ version = "1.17.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6f61fba1741ea2b3d6a1e3178721804bb716a68a6aeba1149b5d52e3d464ea66"
 
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@@ -669,224 +219,6 @@ dependencies = [
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@@ -947,16 +256,6 @@ dependencies = [
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@@ -997,140 +296,18 @@ dependencies = [
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@@ -1154,7 +331,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4c8ffb332579b0557b52d268b91feab8df3615f265d5270fec2a8c95b17c1142"
 dependencies = [
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+ "log",
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diff --git a/ifc/Cargo.toml b/ifc/Cargo.toml
index a75b2ee..a2ab65c 100644
--- a/ifc/Cargo.toml
+++ b/ifc/Cargo.toml
@@ -11,11 +11,6 @@ license-file = "../COPYING"
 
 [dependencies]
 chrono =        { version = "0.4" }
-chrono-tz =     { version = "0.6" }
-iron =          { version = "0.6.1" }
-mustache =      { version = "0.9.0" }
-params =        { version = "*" }
-router =        { version = "*" }
 serde =         { version = "1.0", features = ["derive"] }
 thiserror =     { version = "1" }
 
diff --git a/ifc/src/lib.rs b/ifc/src/lib.rs
index 31aed90..815ef92 100644
--- a/ifc/src/lib.rs
+++ b/ifc/src/lib.rs
@@ -111,7 +111,7 @@ impl From<Month> for String {
 }
 
 fn is_leap_year(year: i32) -> bool {
-    NaiveDate::from_ymd(year, 12, 31).ordinal() == 366
+    NaiveDate::from_ymd_opt(year, 12, 31).unwrap().ordinal() == 366
 }
 
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]