diff --git a/diesel/Cargo.toml b/diesel/Cargo.toml
index 1dc880a1967a..476ef7e4be52 100644
--- a/diesel/Cargo.toml
+++ b/diesel/Cargo.toml
@@ -16,16 +16,17 @@ byteorder = "1.0"
 diesel_derives = "~1.4.0"
 chrono = { version = "0.4", optional = true }
 libc = { version = "0.2.0", optional = true }
-libsqlite3-sys = { version = ">=0.8.0, <0.17.0", optional = true, features = ["min_sqlite_version_3_7_16"] }
+libsqlite3-sys = { version = ">=0.8.0, <0.18.0", optional = true, features = ["min_sqlite_version_3_7_16"] }
 mysqlclient-sys = { version = ">=0.1.0, <0.3.0", optional = true }
 pq-sys = { version = ">=0.3.0, <0.5.0", optional = true }
 quickcheck = { version = "0.4", optional = true }
 serde_json = { version = ">=0.8.0, <2.0", optional = true }
 time = { version = "0.1", optional = true }
-url = { version = "1.4.0", optional = true }
+url = { version = "2.1.0", optional = true }
+percent-encoding = { version = "2.1.0", optional = true }
 uuid = { version = ">=0.2.0, <0.7.0", optional = true, features = ["use_std"] }
-uuidv07 = { version = "0.7.0", optional = true, package = "uuid"}
-ipnetwork = { version = ">=0.12.2, <0.16.0", optional = true }
+uuidv07 = { version = ">=0.7.0, <0.9.0", optional = true, package = "uuid"}
+ipnetwork = { version = ">=0.12.2, <0.17.0", optional = true }
 num-bigint = { version = ">=0.1.41, <0.3", optional = true }
 num-traits = { version = "0.2", optional = true }
 num-integer = { version = "0.1.32", optional = true }
@@ -53,7 +54,7 @@ x128-column-tables = ["128-column-tables"]
 128-column-tables = ["64-column-tables"]
 postgres = ["pq-sys", "bitflags", "diesel_derives/postgres"]
 sqlite = ["libsqlite3-sys", "diesel_derives/sqlite"]
-mysql = ["mysqlclient-sys", "url", "diesel_derives/mysql"]
+mysql = ["mysqlclient-sys", "url", "percent-encoding", "diesel_derives/mysql"]
 with-deprecated = []
 deprecated-time = ["time"]
 network-address = ["ipnetwork", "libc"]
diff --git a/diesel/src/mysql/connection/url.rs b/diesel/src/mysql/connection/url.rs
index 2eae2a6ac076..a38cec1fa7c4 100644
--- a/diesel/src/mysql/connection/url.rs
+++ b/diesel/src/mysql/connection/url.rs
@@ -1,6 +1,7 @@
+extern crate percent_encoding;
 extern crate url;
 
-use self::url::percent_encoding::percent_decode;
+use self::percent_encoding::percent_decode;
 use self::url::{Host, Url};
 use std::ffi::{CStr, CString};
 
@@ -128,7 +129,27 @@ fn first_path_segment_is_treated_as_database() {
 
 #[test]
 fn userinfo_should_be_percent_decode() {
-    use self::url::percent_encoding::{utf8_percent_encode, USERINFO_ENCODE_SET};
+    use self::percent_encoding::{utf8_percent_encode, AsciiSet, CONTROLS};
+    const USERINFO_ENCODE_SET: &AsciiSet = &CONTROLS
+        .add(b' ')
+        .add(b'"')
+        .add(b'<')
+        .add(b'>')
+        .add(b'`')
+        .add(b'#')
+        .add(b'?')
+        .add(b'{')
+        .add(b'}')
+        .add(b'/')
+        .add(b':')
+        .add(b';')
+        .add(b'=')
+        .add(b'@')
+        .add(b'[')
+        .add(b'\\')
+        .add(b']')
+        .add(b'^')
+        .add(b'|');
 
     let username = "x#gfuL?4Zuj{n73m}eeJt0";
     let encoded_username = utf8_percent_encode(username, USERINFO_ENCODE_SET);
diff --git a/diesel/src/pg/connection/raw.rs b/diesel/src/pg/connection/raw.rs
index abeee8fd896b..6a7ccb0c3bb4 100644
--- a/diesel/src/pg/connection/raw.rs
+++ b/diesel/src/pg/connection/raw.rs
@@ -106,7 +106,7 @@ fn last_error_message(conn: *const PGconn) -> String {
     unsafe {
         let error_ptr = PQerrorMessage(conn);
         let bytes = CStr::from_ptr(error_ptr).to_bytes();
-        str::from_utf8_unchecked(bytes).to_string()
+        String::from_utf8_lossy(bytes).to_string()
     }
 }
 
diff --git a/diesel/src/pg/connection/result.rs b/diesel/src/pg/connection/result.rs
index ee2603de2ee9..69c5bd673bb3 100644
--- a/diesel/src/pg/connection/result.rs
+++ b/diesel/src/pg/connection/result.rs
@@ -52,6 +52,8 @@ impl PgResult {
         unsafe {
             let count_char_ptr = PQcmdTuples(self.internal_result.as_ptr());
             let count_bytes = CStr::from_ptr(count_char_ptr).to_bytes();
+            // Using from_utf8_unchecked is ok here because, we've set the
+            // client encoding to utf8
             let count_str = str::from_utf8_unchecked(count_bytes);
             match count_str {
                 "" => 0,
diff --git a/diesel/src/pg/types/uuid_v0_7.rs b/diesel/src/pg/types/uuid_v0_7.rs
index 03ad3ae9a85f..069f11598d26 100644
--- a/diesel/src/pg/types/uuid_v0_7.rs
+++ b/diesel/src/pg/types/uuid_v0_7.rs
@@ -46,7 +46,10 @@ fn some_uuid_from_sql() {
 #[test]
 fn bad_uuid_from_sql() {
     let uuid = uuid::Uuid::from_sql(Some(b"boom"));
-    assert_eq!(uuid.unwrap_err().description(), "UUID parse error");
+    assert_eq!(
+        uuid.unwrap_err().to_string(),
+        "invalid bytes length: expected 16, found 4"
+    );
 }
 
 #[test]
diff --git a/diesel/src/sqlite/connection/raw.rs b/diesel/src/sqlite/connection/raw.rs
index b5a2c392b7a4..820a51ec7d94 100644
--- a/diesel/src/sqlite/connection/raw.rs
+++ b/diesel/src/sqlite/connection/raw.rs
@@ -133,6 +133,7 @@ impl Drop for RawConnection {
 fn convert_to_string_and_free(err_msg: *const libc::c_char) -> String {
     let msg = unsafe {
         let bytes = CStr::from_ptr(err_msg).to_bytes();
+        // sqlite is documented to return utf8 strings here
         str::from_utf8_unchecked(bytes).into()
     };
     unsafe { ffi::sqlite3_free(err_msg as *mut libc::c_void) };
diff --git a/diesel/src/sqlite/connection/sqlite_value.rs b/diesel/src/sqlite/connection/sqlite_value.rs
index 1eef1a5dbb22..c29a18f5e3e7 100644
--- a/diesel/src/sqlite/connection/sqlite_value.rs
+++ b/diesel/src/sqlite/connection/sqlite_value.rs
@@ -35,6 +35,8 @@ impl SqliteValue {
             let ptr = ffi::sqlite3_value_text(self.value());
             let len = ffi::sqlite3_value_bytes(self.value());
             let bytes = slice::from_raw_parts(ptr as *const u8, len as usize);
+            // The string is guaranteed to be utf8 according to
+            // https://www.sqlite.org/c3ref/value_blob.html
             str::from_utf8_unchecked(bytes)
         }
     }
diff --git a/diesel_cli/Cargo.toml b/diesel_cli/Cargo.toml
index 85218045fc56..77aebcc838e5 100644
--- a/diesel_cli/Cargo.toml
+++ b/diesel_cli/Cargo.toml
@@ -24,15 +24,15 @@ migrations_internals = "~1.4.0"
 serde = { version = "1.0.0", features = ["derive"] }
 tempfile = "3.0.0"
 toml = "0.4.6"
-url = { version = "1.4.0", optional = true }
+url = { version = "2.1.0", optional = true }
 barrel = { version = ">= 0.5.0", optional = true, features = ["diesel"] }
-libsqlite3-sys = { version = ">=0.8.0, <0.17.0", optional = true, features = ["min_sqlite_version_3_7_16"] }
+libsqlite3-sys = { version = ">=0.8.0, <0.18.0", optional = true, features = ["min_sqlite_version_3_7_16"] }
 
 [dev-dependencies]
 difference = "1.0"
 tempdir = "0.3.4"
 regex = "0.2"
-url = { version = "1.4.0" }
+url = { version = "2.1.0" }
 
 [features]
 default = ["postgres", "sqlite", "mysql"]
diff --git a/diesel_migrations/migrations_internals/src/migration.rs b/diesel_migrations/migrations_internals/src/migration.rs
index fad2ec8c2904..3ccedb907a47 100644
--- a/diesel_migrations/migrations_internals/src/migration.rs
+++ b/diesel_migrations/migrations_internals/src/migration.rs
@@ -46,12 +46,12 @@ pub fn file_name<'a>(migration: &'a dyn Migration, sql_file: &'a str) -> Migrati
 
 impl<'a> fmt::Display for MigrationFileName<'a> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        let fpath = match self.migration.file_path() {
-            None => return Err(fmt::Error),
-            Some(v) => v.join(self.sql_file),
-        };
-        f.write_str(fpath.to_str().unwrap_or("Invalid utf8 in filename"))?;
-        Ok(())
+        if let Some(path) = self.migration.file_path() {
+            let fpath = path.join(self.sql_file);
+            f.write_str(fpath.to_str().unwrap_or("Invalid utf8 in filename"))
+        } else {
+            write!(f, "{}/{}", self.migration.version(), self.sql_file)
+        }
     }
 }
 
diff --git a/diesel_tests/Cargo.toml b/diesel_tests/Cargo.toml
index 26f262a9c18a..533bad308b14 100644
--- a/diesel_tests/Cargo.toml
+++ b/diesel_tests/Cargo.toml
@@ -14,14 +14,14 @@ dotenv = ">=0.8, <0.11"
 [dependencies]
 assert_matches = "1.0.1"
 chrono = { version = "0.4" }
-diesel = { path = "../diesel", default-features = false, features = ["quickcheck", "chrono", "uuid", "serde_json", "network-address", "numeric", "with-deprecated"] }
+diesel = { path = "../diesel", default-features = false, features = ["quickcheck", "chrono", "uuidv07", "serde_json", "network-address", "numeric", "with-deprecated"] }
 diesel_migrations = { version = "1.4.0" }
 diesel_infer_schema = { version = "1.4.0" }
 dotenv = ">=0.8, <0.11"
 quickcheck = { version = "0.4", features = ["unstable"] }
-uuid = { version = ">=0.2.0, <0.7.0" }
+uuid = { version = ">=0.7.0, <0.9.0" }
 serde_json = { version=">=0.9, <2.0" }
-ipnetwork = ">=0.12.2, <0.16.0"
+ipnetwork = ">=0.12.2, <0.17.0"
 bigdecimal = ">= 0.0.10, <= 0.1.0"
 
 [features]