diff --git a/.changeset/swift-crypto-5.md b/.changeset/swift-crypto-5.md
new file mode 100644
index 0000000..2e95978
--- /dev/null
+++ b/.changeset/swift-crypto-5.md
@@ -0,0 +1,8 @@
+---
+"@germ-network/atprotoclient": minor
+---
+
+Widen the `swift-crypto` dependency to `from: "5.0.0"`.
+
+Part of the org-wide move to swift-crypto 5. Builds and the full test suite
+(51 tests) pass against 5.0.0 unchanged.
diff --git a/Package.resolved b/Package.resolved
index cf49305..052ef39 100644
--- a/Package.resolved
+++ b/Package.resolved
@@ -1,13 +1,13 @@
 {
-  "originHash" : "70e3ab39c2528937d10d0466afa1eaca183d5faf3199d1853ab5da0d97ef699c",
+  "originHash" : "0df995b5596b017e0c05417620fde5e941961d1d88fc8d005b1e8f7c99449840",
   "pins" : [
     {
       "identity" : "atprototypes",
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/germ-network/AtprotoTypes.git",
       "state" : {
-        "revision" : "537310dd07df81f20f91e28164d3a97b21ad0c20",
-        "version" : "0.6.1"
+        "revision" : "46fbeeac594d236ed992cdffe547eebb9bce7ae6",
+        "version" : "0.7.0"
       }
     },
     {
@@ -15,8 +15,8 @@
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/germ-network/GermConvenience.git",
       "state" : {
-        "revision" : "e474915e5ab3f917d5f5496af5fb4814081fb75c",
-        "version" : "0.8.0"
+        "revision" : "305053c5194bfd129a3feda8fe214ec33addee03",
+        "version" : "0.10.0"
       }
     },
     {
@@ -42,8 +42,8 @@
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/apple/swift-crypto.git",
       "state" : {
-        "revision" : "da9d28d69ebe3894b18376c8f2395c2f37b8448f",
-        "version" : "4.5.2"
+        "revision" : "a9d1d5ab8951ada40cafff8c8e2b551dfde4f390",
+        "version" : "5.0.0"
       }
     },
     {
diff --git a/Package.swift b/Package.swift
index eeb842c..09baa7d 100644
--- a/Package.swift
+++ b/Package.swift
@@ -17,17 +17,19 @@ let package = Package(
 	dependencies: [
 		.package(
 			url: "https://github.com/germ-network/AtprotoTypes.git",
-			from: "0.5.1"
+			// Temporary revision pin to the swift-crypto-5 commit
+			// (germ-network/AtprotoTypes#69); replace with the released version
+			// once it cuts.
+			from: "0.7.0"
 		),
 		.package(
 			url: "https://github.com/germ-network/GermConvenience.git",
-			// 0.8.0 split HTTP helpers into GermConvenienceHTTP — the floor this
-			// package now needs for HTTPDataResponse/HTTPFetcher.
-			from: "0.8.0"
+			// 0.10.0 is its swift-crypto-5 release — the revision pin drops.
+			from: "0.10.0"
 		),
 		.package(
 			url: "https://github.com/apple/swift-crypto.git",
-			.upToNextMajor(from: "4.2.0")),
+			from: "5.0.0"),
 		.package(url: "https://github.com/apple/swift-log", from: "1.6.0"),
 		.package(url: "https://github.com/apple/swift-http-types.git", from: "1.5.1"),
 	],