diff --git a/Cargo.lock b/Cargo.lock
index 4e380034b6c..6df4b4bdb20 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -160,10 +160,10 @@ dependencies = [
  "conduit-test 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "cookie 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "derive_deref 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "diesel 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "diesel 1.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "diesel_full_text_search 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "diesel_ltree 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "diesel_migrations 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "diesel_migrations 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "docopt 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "dotenv 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.5.10 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -507,13 +507,13 @@ dependencies = [
 
 [[package]]
 name = "diesel"
-version = "1.3.0"
+version = "1.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "chrono 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "diesel_derives 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "diesel_derives 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "pq-sys 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "r2d2 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -521,12 +521,12 @@ dependencies = [
 
 [[package]]
 name = "diesel_derives"
-version = "1.3.0"
+version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.13.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.13 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -534,7 +534,7 @@ name = "diesel_full_text_search"
 version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "diesel 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "diesel 1.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -548,11 +548,11 @@ dependencies = [
 
 [[package]]
 name = "diesel_migrations"
-version = "1.3.0"
+version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "migrations_internals 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "migrations_macros 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "migrations_internals 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "migrations_macros 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1197,18 +1197,18 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "migrations_internals"
-version = "1.3.0"
+version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "diesel 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "diesel 1.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "migrations_macros"
-version = "1.3.0"
+version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "migrations_internals 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "migrations_internals 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)",
  "syn 0.11.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1478,14 +1478,6 @@ name = "precomputed-hash"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "proc-macro2"
-version = "0.3.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "proc-macro2"
 version = "0.4.6"
@@ -1504,14 +1496,6 @@ name = "quote"
 version = "0.3.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "quote"
-version = "0.5.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "proc-macro2 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "quote"
 version = "0.6.3"
@@ -1771,7 +1755,7 @@ name = "semver"
 version = "0.9.0"
 source = "git+https://github.com/steveklabnik/semver.git#27c2b066cc0d3818f8b2047388ce29be2e4c97e1"
 dependencies = [
- "diesel 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "diesel 1.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "semver-parser 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1907,16 +1891,6 @@ dependencies = [
  "unicode-xid 0.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "syn"
-version = "0.13.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "proc-macro2 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "syn"
 version = "0.14.2"
@@ -2504,11 +2478,11 @@ dependencies = [
 "checksum derive-error-chain 0.11.2 (registry+https://github.com/rust-lang/crates.io-index)" = "d5f8006bdd4c5b90d4571abe68285c6e9863122a5ee695ff3583e8e1dee8f28a"
 "checksum derive_deref 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "75977fd13de1d8a2b0db58cb124e8f1e63cf233917fea33065e8b214d1eccdb8"
 "checksum diesel 0.16.0 (registry+https://github.com/rust-lang/crates.io-index)" = "304226fa7a3982b0405f6bb95dd9c10c3e2000709f194038a60ec2c277150951"
-"checksum diesel 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d9db28a518f3e0c61bdb0044d9a8b2b369373c090c19fec07e49e3b8511dcffa"
-"checksum diesel_derives 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "03bcaf77491f53e400d5ee3bdd57142ea4e1c47fe9217b3361ff9a76ca0e3d37"
+"checksum diesel 1.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "a2469cbcf1dfb9446e491cac4c493c2554133f87f7d041e892ac82e5cd36e863"
+"checksum diesel_derives 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "62a27666098617d52c487a41f70de23d44a1dc1f3aa5877ceba2790fb1f1cab4"
 "checksum diesel_full_text_search 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "c6bb76b26499ddcd4672f4a47fa6cdf97b5dfbedf688c4e2f386ba576585b4ae"
 "checksum diesel_ltree 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a5be92b29f9c84222bc20759c0f45e3a0cfb390da8ce98a10a1414894eceafea"
-"checksum diesel_migrations 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "17b42c35d1ce9e8d57a3e7001b4127f2bc1b073a89708bb7019f5be27c991c28"
+"checksum diesel_migrations 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "bf3cde8413353dc7f5d72fa8ce0b99a560a359d2c5ef1e5817ca731cd9008f4c"
 "checksum docopt 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "3b5b93718f8b3e5544fcc914c43de828ca6c6ace23e0332c6080a2977b49787a"
 "checksum dotenv 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d6f0e2bb24d163428d8031d3ebd2d2bd903ad933205a97d0f18c7c1aade380f3"
 "checksum dotenv 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a70de3c590ce18df70743cace1cf12565637a0b26fd8b04ef10c7d33fdc66cdc"
@@ -2583,8 +2557,8 @@ dependencies = [
 "checksum memchr 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "148fab2e51b4f1cfc66da2a7c32981d1d3c083a803978268bb11fe4b86925e7a"
 "checksum memchr 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e01e64d9017d18e7fc09d8e4fe0e28ff6931019e979fb8019319db7ca827f8a6"
 "checksum memoffset 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "0f9dc261e2b62d7a622bf416ea3c5245cdd5d9a7fcc428c0d06804dfce1775b3"
-"checksum migrations_internals 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8cf7c8c4f83fa9f47440c0b4af99973502de55e6e7b875f693bd263e03f93e7e"
-"checksum migrations_macros 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "79f12499ef7353bdeca2d081bc61edd8351dac09a33af845952009b5a3d68c1a"
+"checksum migrations_internals 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8089920229070f914b9ce9b07ef60e175b2b9bc2d35c3edd8bf4433604e863b9"
+"checksum migrations_macros 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1664412abf7db2b8a6d58be42a38b099780cc542b5b350383b805d88932833fe"
 "checksum mime 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)" = "fe51c8699d2dc522bf8c1ebe26ea2193d151fb54bcdfd7d0318750c189994cd9"
 "checksum mime_guess 2.0.0-alpha.6 (registry+https://github.com/rust-lang/crates.io-index)" = "30de2e4613efcba1ec63d8133f344076952090c122992a903359be5a4f99c3ed"
 "checksum miniz-sys 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)" = "609ce024854aeb19a0ef7567d348aaa5a746b32fb72e336df7fcc16869d7e2b4"
@@ -2614,11 +2588,9 @@ dependencies = [
 "checksum pkg-config 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "3a8b4c6b8165cd1a1cd4b9b120978131389f64bdaf456435caa41e630edba903"
 "checksum pq-sys 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)" = "4dfb5e575ef93a1b7b2a381d47ba7c5d4e4f73bff37cee932195de769aad9a54"
 "checksum precomputed-hash 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "925383efa346730478fb4838dbe9137d2a47675ad789c546d150a6e1dd4ab31c"
-"checksum proc-macro2 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)" = "1b06e2f335f48d24442b35a19df506a835fb3547bc3c06ef27340da9acf5cae7"
 "checksum proc-macro2 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)" = "effdb53b25cdad54f8f48843d67398f7ef2e14f12c1b4cb4effc549a6462a4d6"
 "checksum quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9274b940887ce9addde99c4eee6b5c44cc494b182b97e73dc8ffdcb3397fd3f0"
 "checksum quote 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)" = "7a6e920b65c65f10b2ae65c831a81a073a89edd28c7cce89475bff467ab4167a"
-"checksum quote 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9949cfe66888ffe1d53e6ec9d9f3b70714083854be20fd5e271b232a017401e8"
 "checksum quote 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)" = "e44651a0dc4cdd99f71c83b561e221f714912d11af1a4dff0631f923d53af035"
 "checksum r2d2 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "59611202bee496c586ecd84e3ed149b4ec75981b0fc10d7f60e878fa23ae16e9"
 "checksum rand 0.3.18 (registry+https://github.com/rust-lang/crates.io-index)" = "6475140dfd8655aeb72e1fd4b7a1cc1c202be65d71669476e392fe62532b9edd"
@@ -2666,7 +2638,6 @@ dependencies = [
 "checksum string_cache_shared 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b1884d1bc09741d466d9b14e6d37ac89d6909cbcac41dd9ae982d4d063bbedfc"
 "checksum strsim 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b4d15c810519a91cf877e7e36e63fe068815c678181439f2f29e2562147c3694"
 "checksum syn 0.11.11 (registry+https://github.com/rust-lang/crates.io-index)" = "d3b891b9015c88c576343b9b3e41c2c11a51c219ef067b264bd9c8aa9b441dad"
-"checksum syn 0.13.11 (registry+https://github.com/rust-lang/crates.io-index)" = "14f9bf6292f3a61d2c716723fdb789a41bbe104168e6f496dc6497e531ea1b9b"
 "checksum syn 0.14.2 (registry+https://github.com/rust-lang/crates.io-index)" = "c67da57e61ebc7b7b6fff56bb34440ca3a83db037320b0507af4c10368deda7d"
 "checksum syn 0.15.13 (registry+https://github.com/rust-lang/crates.io-index)" = "7b4439ee8325b4e4b57e59309c3724c9a4478eaeb4eb094b6f3fac180a3b2876"
 "checksum synom 0.11.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a393066ed9010ebaed60b9eafa373d4b1baac186dd7e008555b0f702b51945b6"
diff --git a/Cargo.toml b/Cargo.toml
index 8b315edbc9f..b875219c851 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -47,7 +47,7 @@ htmlescape = "0.3.1"
 license-exprs = "^1.4"
 dotenv = "0.11.0"
 toml = "0.4"
-diesel = { version = "1.3.0", features = ["postgres", "serde_json", "chrono", "r2d2"] }
+diesel = { version = "1.4.0", features = ["postgres", "serde_json", "chrono", "r2d2"] }
 diesel_full_text_search = "1.0.0"
 diesel_ltree = "0.1.3"
 serde_json = "1.0.0"
diff --git a/src/bin/update-downloads.rs b/src/bin/update-downloads.rs
index f67a1f411d8..6f08509e678 100644
--- a/src/bin/update-downloads.rs
+++ b/src/bin/update-downloads.rs
@@ -1,5 +1,4 @@
 #![deny(warnings)]
-#![allow(unknown_lints, proc_macro_derive_resolution_fallback)] // This can be removed after diesel-1.4
 
 #[macro_use]
 extern crate diesel;
diff --git a/src/lib.rs b/src/lib.rs
index 5f06c604e2c..a360f96555d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -7,7 +7,6 @@
 #![deny(missing_debug_implementations, missing_copy_implementations)]
 #![deny(bare_trait_objects)]
 #![recursion_limit = "256"]
-#![allow(unknown_lints, proc_macro_derive_resolution_fallback)] // TODO: This can be removed after diesel-1.4
 
 #[macro_use]
 extern crate derive_deref;
diff --git a/src/tests/all.rs b/src/tests/all.rs
index dae2d6fa184..e227d590569 100644
--- a/src/tests/all.rs
+++ b/src/tests/all.rs
@@ -1,5 +1,4 @@
 #![deny(warnings)]
-#![allow(unknown_lints, proc_macro_derive_resolution_fallback)] // TODO: This can be removed after diesel-1.4
 
 #[macro_use]
 extern crate diesel;