diff --git a/Cargo.lock b/Cargo.lock
index 6eaf94e..798bcd2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -321,11 +321,6 @@ name = "libc"
 version = "0.2.48"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "linked-hash-map"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "matches"
 version = "0.1.8"
@@ -477,7 +472,6 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "getopts 0.2.15 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -700,7 +694,6 @@ dependencies = [
  "serde_derive 1.0.85 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.37 (registry+https://github.com/rust-lang/crates.io-index)",
  "walkdir 2.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "yaml-rust 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -896,14 +889,6 @@ dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "yaml-rust"
-version = "0.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "linked-hash-map 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [metadata]
 "checksum adler32 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "7e522997b529f05601e05166c07ed17789691f562762c7f3b987263d2dedee5c"
 "checksum aho-corasick 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)" = "d6531d44de723825aa81398a6415283229725a00fa30713812ab9323faa82fc4"
@@ -948,7 +933,6 @@ dependencies = [
 "checksum lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a374c89b9db55895453a74c1e38861d9deec0b01b405a82516e9d5de4820dea1"
 "checksum lazycell 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b294d6fa9ee409a054354afc4352b0b9ef7ca222c69b8812cbea9e7d2bf3783f"
 "checksum libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)" = "e962c7641008ac010fa60a7dfdc1712449f29c44ef2d4702394aea943ee75047"
-"checksum linked-hash-map 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "70fb39025bc7cdd76305867c4eccf2f2dcf6e9a57f5b21a93e1c2d86cd03ec9e"
 "checksum matches 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "7ffc5c5338469d4d3ea17d269fa8ea3512ad247247c30bd2df69e68309ed0a08"
 "checksum mdcat 0.12.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b3ec2ab8c40c83ffa18fc507ed83f9e7acc9acbb855f86db510235c4150cbcb7"
 "checksum memchr 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "796fba70e76612589ed2ce7f45282f5af869e0fdd7cc6199fa1aa1f1d591ba9d"
@@ -1018,4 +1002,3 @@ dependencies = [
 "checksum winapi-util 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7168bab6e1daee33b4557efd0e95d5ca70a03706d39fa5f3fe7a236f584b03c9"
 "checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 "checksum xml-rs 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3c1cb601d29fe2c2ac60a2b2e5e293994d87a1f6fa9687a31a15270f909be9c2"
-"checksum yaml-rust 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "95acf0db5515d07da9965ec0e0ba6cc2d825e2caeb7303b66ca441729801254e"
diff --git a/Cargo.toml b/Cargo.toml
index 1de8a36..bcae101 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,7 +2,7 @@
 name = "rsmodules"
 version = "0.6.3"
 authors = ["Frederik Delaere <frederik.delaere@ugent.be>"]
-edition = "2015"
+edition = "2018"
 
 [dependencies]
 rand = "0.3"
@@ -22,14 +22,22 @@ ansi_term = "0.9"
 glob = "0.2"
 dirs = "1.0"
 pbr = "1.0.1"
-syntect = "*"
-pulldown-cmark = "*"
 
 [dependencies.mdcat]
 version = "0.12.1"
 default-features = false
 features = ["vte50", "iterm2", "terminology"]
 
+[dependencies.pulldown-cmark]
+version = "^0.2"
+default-features = false
+features = []
+
+[dependencies.syntect]
+version = "^3"
+default-features = false
+features = ["parsing", "assets", "dump-load"]
+
 [[bin]]
 name = "rsmodules"
 path = "src/main.rs"