diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 0aaad7d..8275c15 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -83,7 +83,7 @@ cleanup-stable:
 
 cleanup-msrv:
   extends: cleanup-stable
-  image: "rust:1.54.0"
+  image: "rust:1.56.0"
   cache:
     key: msrv
     paths:
@@ -107,7 +107,7 @@ build-base-stable:
 build-base-msrv:
   extends: build-base-stable
   needs: ["cleanup-msrv"]
-  image: "rust:1.54.0"
+  image: "rust:1.56.0"
   cache:
     key: msrv
     paths:
@@ -133,7 +133,7 @@ build-stable:
 build-msrv:
   extends: build-stable
   needs: ["build-base-msrv"]
-  image: "rust:1.54.0"
+  image: "rust:1.56.0"
   cache:
     key: msrv
     paths:
@@ -158,7 +158,7 @@ test-stable:
 
 test-msrv:
   extends: test-stable
-  image: "rust:1.54.0"
+  image: "rust:1.56.0"
   needs: ["build-msrv"]
   cache:
     key: msrv
diff --git a/CHANGELOG.md b/CHANGELOG.md
index a0a5179..f6ef523 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,7 +6,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## Unreleased
 ## Changed
-- MSRV is now 1.54.0
+- MSRV is now 1.56.0
   - A few dependencies have been updated, most notably [`clap`]
 ### Added
 - AIFF (Audio Interchange File Format, a PCM audio format like WAV) detection to [`infer`]
diff --git a/Cargo.lock b/Cargo.lock
index 165635f..25a1afa 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -27,9 +27,9 @@ checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
 
 [[package]]
 name = "bitflags"
-version = "1.3.2"
+version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
+checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
 
 [[package]]
 name = "byteorder"
@@ -346,10 +346,11 @@ checksum = "2a60c7ce501c71e03a9c9c0d35b861413ae925bd979cc7a4e30d060069aaac8d"
 
 [[package]]
 name = "new_mime_guess"
-version = "3.0.0"
+version = "3.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c8c8e990db7ba41ce2b4b3a38380a0f3385d61c55b3d4999d6e00389562a79a2"
+checksum = "b101054f57b10576d116bc0da7ce8b05362b4490b0d21c7748395eaaf9359047"
 dependencies = [
+ "bitflags",
  "mime",
  "phf",
  "phf_codegen",
@@ -391,18 +392,18 @@ checksum = "6acbef58a60fe69ab50510a55bc8cdd4d6cf2283d27ad338f54cb52747a9cf2d"
 
 [[package]]
 name = "phf"
-version = "0.9.0"
+version = "0.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b2ac8b67553a7ca9457ce0e526948cad581819238f4a9d1ea74545851fa24f37"
+checksum = "b9fc3db1018c4b59d7d582a739436478b6035138b6aecbce989fc91c3e98409f"
 dependencies = [
  "phf_shared",
 ]
 
 [[package]]
 name = "phf_codegen"
-version = "0.9.0"
+version = "0.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "963adb11cf22ee65dfd401cf75577c1aa0eca58c0b97f9337d2da61d3e640503"
+checksum = "4fb1c3a8bc4dd4e5cfce29b44ffc14bedd2ee294559a294e2a4d4c9e9a6a13cd"
 dependencies = [
  "phf_generator",
  "phf_shared",
@@ -410,9 +411,9 @@ dependencies = [
 
 [[package]]
 name = "phf_generator"
-version = "0.9.1"
+version = "0.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d43f3220d96e0080cc9ea234978ccd80d904eafb17be31bb0f76daaea6493082"
+checksum = "5d5285893bb5eb82e6aaf5d59ee909a06a16737a8970984dd7746ba9283498d6"
 dependencies = [
  "phf_shared",
  "rand",
@@ -420,9 +421,9 @@ dependencies = [
 
 [[package]]
 name = "phf_shared"
-version = "0.9.0"
+version = "0.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a68318426de33640f02be62b4ae8eb1261be2efbc337b60c54d845bf4484e0d9"
+checksum = "b6796ad771acdc0123d2a88dc428b5e38ef24456743ddb1744ed628f9815c096"
 dependencies = [
  "siphasher",
  "unicase",
diff --git a/Cargo.toml b/Cargo.toml
index ab8386f..fab3a45 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,16 +3,22 @@ name = "fif"
 description = "A command-line tool for detecting and optionally correcting files with incorrect extensions."
 version = "0.3.6"
 authors = ["Lynnesbian <lynne@bune.city>"]
-edition = "2018"
+edition = "2021"
 license = "GPL-3.0-or-later"
-rust-version = "1.54.0"
+rust-version = "1.56.0"
 repository = "https://gitlab.com/Lynnesbian/fif"
 readme = "README.md"
 keywords = ["mime", "mimetype", "utilities", "tools"]
 categories = ["command-line-utilities"]
 exclude = [".idea/", "*.toml", "!Cargo.toml", "*.sh", "*.py", "*.yml", "*.md", ".mailmap", "pkg/"]
-#resolver = "2"
-#license-file = "LICENSE"
+
+# unfortunately, we can't use resolver v2 right now, because one of the phf crates (i think it's phf_codegen) that are
+# pulled in by new_mime_guess' phf-map feature doesn't enable phf_shared's unicase feature when it should.
+# this causes new_mime_guess' build.rs to fail with errors about PhfHash traits and such not being implemented for
+# UniCase<&str>.
+# there's no way to fix this in either fif or new_mime_guess itself, short of a patch (which can't be used on
+# crates.io), so we'll have to disable the new resolver for now :(
+resolver = "1"
 
 [badges]
 maintenance = { status = "experimental" }
@@ -83,4 +89,4 @@ opt-level = 3
 opt-level = 3
 
 [package.metadata]
-msrv = "1.54.0"
\ No newline at end of file
+msrv = "1.56.0"
\ No newline at end of file
diff --git a/README.md b/README.md
index 6ca710f..4694c7b 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@
 
 [![Version](https://img.shields.io/crates/v/fif.svg?logo=rust&style=flat-square)
 ](https://crates.io/crates/fif)
-[![Minimum Supported Rust Version](https://img.shields.io/badge/msrv-1.54.0-orange?logo=rust&style=flat-square)
+[![Minimum Supported Rust Version](https://img.shields.io/badge/msrv-1.56.0-orange?logo=rust&style=flat-square)
 ](https://gitlab.com/Lynnesbian/fif/-/blob/master/README.md#version-policy)
 [![License](https://img.shields.io/crates/l/fif.svg?style=flat-square)
 ](https://gitlab.com/Lynnesbian/fif/-/blob/master/LICENSE)
diff --git a/clippy.toml b/clippy.toml
index 840d1ad..a636165 100644
--- a/clippy.toml
+++ b/clippy.toml
@@ -1,3 +1,3 @@
 # avoid-breaking-exported-api = false # only available on nightly for now
 cognitive-complexity-threshold = 15
-msrv = "1.54.0"
\ No newline at end of file
+msrv = "1.56.0"
\ No newline at end of file
diff --git a/test.py b/test.py
index 79fde34..04c263c 100755
--- a/test.py
+++ b/test.py
@@ -24,7 +24,9 @@ def test_versions():
 		print("Couldn't find rust-version")
 		exit(1)
 
-	versions = [match.group(1), "stable", "nightly"]
+ 	# versions = [match.group(1), "stable", "nightly"]
+	# remove this when 1.56 is released
+	versions = ["beta", "nightly"]
 	backends = ["xdg-mime", "infer"]
 
 	upto = 1