diff --git a/Cargo.lock b/Cargo.lock
index 0600765..c2a62a0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,26 +1,13 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
+
 [[package]]
 name = "adler"
 version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ee2a4ec343196209d6594e19543ae87a39f96d5534d7174822a3ad825dd6ed7e"
 
-[[package]]
-name = "adler32"
-version = "1.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "aae1277d39aeec15cb388266ecc24b11c80469deae6067e17a1a7aa9e5c1f234"
-
-[[package]]
-name = "approx"
-version = "0.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f0e60b75072ecd4168020818c0107f2857bb6c4e64252d8d3983f6263b40a5c3"
-dependencies = [
- "num-traits",
-]
-
 [[package]]
 name = "argparse"
 version = "0.2.2"
@@ -39,12 +26,6 @@ version = "0.2.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1b20b618342cf9891c292c4f5ac2cde7287cc5c87e87e9c769d617793607dec1"
 
-[[package]]
-name = "bitflags"
-version = "1.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
-
 [[package]]
 name = "bstr"
 version = "0.2.13"
@@ -63,12 +44,6 @@ version = "3.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2e8c087f005730276d1096a652e92a8bacee2e2472bcc9715a74d2bec38b5820"
 
-[[package]]
-name = "bytemuck"
-version = "1.4.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "41aa2ec95ca3b5c54cf73c91acf06d24f4495d5f1b1c12506ae3483d646177ac"
-
 [[package]]
 name = "byteorder"
 version = "1.3.4"
@@ -87,12 +62,6 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
-[[package]]
-name = "color_quant"
-version = "1.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0dbbb57365263e881e805dc77d94697c9118fd94d8da011240555aa7b23445bd"
-
 [[package]]
 name = "const_fn"
 version = "0.4.2"
@@ -130,16 +99,6 @@ dependencies = [
  "memchr",
 ]
 
-[[package]]
-name = "deflate"
-version = "0.8.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "73770f8e1fe7d64df17ca66ad28994a0a623ea497fa69486e14984e715c5d174"
-dependencies = [
- "adler32",
- "byteorder",
-]
-
 [[package]]
 name = "discard"
 version = "1.0.4"
@@ -225,62 +184,26 @@ dependencies = [
  "cfg-if 0.1.10",
  "crc32fast",
  "libc",
- "miniz_oxide 0.4.2",
+ "miniz_oxide",
 ]
 
 [[package]]
 name = "getrandom"
-version = "0.1.15"
+version = "0.2.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fc587bc0ec293155d5bfa6b9891ec18a1e330c234f896ea47fbada4cadbe47e6"
+checksum = "4eb1a864a501629691edf6c15a593b7a51eebaa1e8468e9ddc623de7c9b58ec6"
 dependencies = [
- "cfg-if 0.1.10",
+ "cfg-if 1.0.0",
  "libc",
  "wasi",
 ]
 
-[[package]]
-name = "gif"
-version = "0.10.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "471d90201b3b223f3451cd4ad53e34295f16a1df17b1edf3736d47761c3981af"
-dependencies = [
- "color_quant",
- "lzw",
-]
-
-[[package]]
-name = "image"
-version = "0.23.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "974e194911d1f7efe3cd8a8f9db3b767e43536327e899e8bc9a12ef5711b74d2"
-dependencies = [
- "bytemuck",
- "byteorder",
- "gif",
- "jpeg-decoder",
- "num-iter",
- "num-rational",
- "num-traits",
- "png",
- "tiff",
-]
-
 [[package]]
 name = "itoa"
 version = "0.4.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dc6f3ad7b9d11a0c00842ff8de1b60ee58661048eb8049ed33c73594f359d7e6"
 
-[[package]]
-name = "jpeg-decoder"
-version = "0.1.20"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cc797adac5f083b8ff0ca6f6294a999393d76e197c36488e2ef732c4715f6fa3"
-dependencies = [
- "byteorder",
-]
-
 [[package]]
 name = "js-sys"
 version = "0.3.50"
@@ -298,9 +221,9 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
 [[package]]
 name = "libc"
-version = "0.2.77"
+version = "0.2.131"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f2f96b10ec2560088a8e76961b00d47107b3a625fecb76dedb29ee7ccbf98235"
+checksum = "04c3b4822ccebfa39c02fc03d1534441b22ead323fa0f48bb7ddd8e6ba076a40"
 
 [[package]]
 name = "linked-hash-map"
@@ -319,41 +242,28 @@ dependencies = [
 
 [[package]]
 name = "lopdf"
-version = "0.26.0"
+version = "0.27.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b49a0272112719d0037ab63d4bb67f73ba659e1e90bc38f235f163a457ac16f3"
+checksum = "8146695b97752d9c66da0092c6364f8f3ca683f5ea34341db21e5550c3b8c4f4"
 dependencies = [
  "dtoa",
  "encoding",
  "flate2",
  "itoa",
+ "lazy_static",
  "linked-hash-map",
  "log",
- "lzw",
+ "pom",
  "time",
+ "weezl",
 ]
 
-[[package]]
-name = "lzw"
-version = "0.10.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7d947cbb889ed21c2a84be6ffbaebf5b4e0f4340638cba0444907e38b56be084"
-
 [[package]]
 name = "memchr"
 version = "2.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3728d817d99e5ac407411fa471ff9800a778d88a24685968b36824eaf4bee400"
 
-[[package]]
-name = "miniz_oxide"
-version = "0.3.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "791daaae1ed6889560f8c4359194f56648355540573244a5448a83ba1ecc7435"
-dependencies = [
- "adler32",
-]
-
 [[package]]
 name = "miniz_oxide"
 version = "0.4.2"
@@ -365,66 +275,19 @@ dependencies = [
 ]
 
 [[package]]
-name = "num-integer"
-version = "0.1.43"
+name = "owned_ttf_parser"
+version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8d59457e662d541ba17869cf51cf177c0b5f0cbf476c66bdc90bf1edac4f875b"
+checksum = "60ac8dda2e5cc09bf6480e3b3feff9783db251710c922ae9369a429c51efdeb0"
 dependencies = [
- "autocfg",
- "num-traits",
+ "ttf-parser",
 ]
 
 [[package]]
-name = "num-iter"
-version = "0.1.41"
+name = "pom"
+version = "3.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7a6e6b7c748f995c4c29c5f5ae0248536e04a5739927c74ec0fa564805094b9f"
-dependencies = [
- "autocfg",
- "num-integer",
- "num-traits",
-]
-
-[[package]]
-name = "num-rational"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a5b4d7360f362cfb50dde8143501e6940b22f644be75a4cc90b2d81968908138"
-dependencies = [
- "autocfg",
- "num-integer",
- "num-traits",
-]
-
-[[package]]
-name = "num-traits"
-version = "0.2.12"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ac267bcc07f48ee5f8935ab0d24f316fb722d7a1292e2913f0cc196b29ffd611"
-dependencies = [
- "autocfg",
-]
-
-[[package]]
-name = "ordered-float"
-version = "1.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3741934be594d77de1c8461ebcbbe866f585ea616a9753aa78f2bdc69f0e4579"
-dependencies = [
- "num-traits",
-]
-
-[[package]]
-name = "png"
-version = "0.16.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dfe7f9f1c730833200b134370e1d5098964231af8450bce9b78ee3ab5278b970"
-dependencies = [
- "bitflags",
- "crc32fast",
- "deflate",
- "miniz_oxide 0.3.7",
-]
+checksum = "07e2192780e9f8e282049ff9bffcaa28171e1cb0844f49ed5374e518ae6024ec"
 
 [[package]]
 name = "ppv-lite86"
@@ -434,14 +297,13 @@ checksum = "c36fa947111f5c62a733b652544dd0016a43ce89619538a8ef92724a6f501a20"
 
 [[package]]
 name = "printpdf"
-version = "0.3.4"
+version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1a2472a184bcb128d0e3db65b59ebd11d010259a5e14fd9d048cba8f2c9302d4"
+checksum = "382011eb582243f0c84620293a50d6a2d142494ed156463511ab5c44580e60fd"
 dependencies = [
- "image",
  "js-sys",
  "lopdf",
- "rusttype",
+ "owned_ttf_parser",
  "time",
 ]
 
@@ -471,23 +333,20 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.7.3"
+version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
 dependencies = [
- "getrandom",
  "libc",
  "rand_chacha",
  "rand_core",
- "rand_hc",
- "rand_pcg",
 ]
 
 [[package]]
 name = "rand_chacha"
-version = "0.2.2"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
  "rand_core",
@@ -495,31 +354,13 @@ dependencies = [
 
 [[package]]
 name = "rand_core"
-version = "0.5.1"
+version = "0.6.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
+checksum = "d34f1408f55294453790c48b2f1ebbb1c5b4b7563eb1f418bcfcfdbb06ebb4e7"
 dependencies = [
  "getrandom",
 ]
 
-[[package]]
-name = "rand_hc"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
-dependencies = [
- "rand_core",
-]
-
-[[package]]
-name = "rand_pcg"
-version = "0.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "16abd0c1b639e9eb4d7c50c0b8100b0d0f849be2349829c740fe8e6eb4816429"
-dependencies = [
- "rand_core",
-]
-
 [[package]]
 name = "regex-automata"
 version = "0.1.9"
@@ -538,17 +379,6 @@ dependencies = [
  "semver",
 ]
 
-[[package]]
-name = "rusttype"
-version = "0.8.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9f61411055101f7b60ecf1041d87fb74205fb20b0c7a723f07ef39174cf6b4c0"
-dependencies = [
- "approx",
- "ordered-float",
- "stb_truetype",
-]
-
 [[package]]
 name = "ryu"
 version = "1.0.5"
@@ -613,15 +443,6 @@ dependencies = [
  "version_check",
 ]
 
-[[package]]
-name = "stb_truetype"
-version = "0.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f77b6b07e862c66a9f3e62a07588fee67cd90a9135a2b942409f195507b4fb51"
-dependencies = [
- "byteorder",
-]
-
 [[package]]
 name = "stdweb"
 version = "0.4.20"
@@ -673,7 +494,7 @@ checksum = "213701ba3370744dcd1a12960caa4843b3d68b4d1c0a5d575e0d65b2ee9d16c0"
 
 [[package]]
 name = "sudoku_solver"
-version = "0.1.0"
+version = "0.2.0"
 dependencies = [
  "argparse",
  "csv",
@@ -692,17 +513,6 @@ dependencies = [
  "unicode-xid",
 ]
 
-[[package]]
-name = "tiff"
-version = "0.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3f3b8a87c4da944c3f27e5943289171ac71a6150a79ff6bacfff06d159dfff2f"
-dependencies = [
- "byteorder",
- "lzw",
- "miniz_oxide 0.3.7",
-]
-
 [[package]]
 name = "time"
 version = "0.2.21"
@@ -741,6 +551,12 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "ttf-parser"
+version = "0.12.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7ae2f58a822f08abdaf668897e96a5656fe72f5a9ce66422423e8849384872e6"
+
 [[package]]
 name = "unicode-xid"
 version = "0.2.1"
@@ -755,9 +571,9 @@ checksum = "b5a972e5669d67ba988ce3dc826706fb0a8b01471c088cb0b6110b805cc36aed"
 
 [[package]]
 name = "wasi"
-version = "0.9.0+wasi-snapshot-preview1"
+version = "0.11.0+wasi-snapshot-preview1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
+checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
 
 [[package]]
 name = "wasm-bindgen"
@@ -813,6 +629,12 @@ version = "0.2.73"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d9a543ae66aa233d14bb765ed9af4a33e81b8b58d1584cf1b47ff8cd0b9e4489"
 
+[[package]]
+name = "weezl"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9193164d4de03a926d909d3bc7c30543cecb35400c02114792c2cae20d5e2dbb"
+
 [[package]]
 name = "winapi"
 version = "0.3.9"
diff --git a/Cargo.toml b/Cargo.toml
index 2ff7daa..225e91d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,16 +1,16 @@
 [package]
 name = "sudoku_solver"
-version = "0.1.0"
+version = "0.2.0"
 authors = ["Joel Therrien <joel@joeltherrien.ca>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
 csv = "1.1.3"
 argparse = "0.2.2"
-printpdf = "0.3.4"
+printpdf = "0.5.2"
 
 [dependencies.rand]
-version = "0.7"
+version = "0.8.5"
 features = ["small_rng"]
\ No newline at end of file
diff --git a/src/generator.rs b/src/generator.rs
index dcb8918..0c383a0 100644
--- a/src/generator.rs
+++ b/src/generator.rs
@@ -195,7 +195,7 @@ fn generate_completed_grid(rng: &mut SmallRng) -> Grid {
         // We do this in a loop so that if we are really unlucky and our guesses stop there from being any solution, we can easily re-run it
         let grid = Grid::new();
 
-        let digit_excluded = rng.gen_range(1, 10);
+        let digit_excluded = rng.gen_range(0..=9);
 
         for digit in 1..10 {
             if digit != digit_excluded {