diff --git a/.github/workflows/go-check.yml b/.github/workflows/go-check.yml
index 25e1afd..251f7fa 100644
--- a/.github/workflows/go-check.yml
+++ b/.github/workflows/go-check.yml
@@ -11,12 +11,12 @@ jobs:
     env:
       RUNGOGENERATE: false
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           submodules: recursive
-      - uses: actions/setup-go@v2
+      - uses: actions/setup-go@v3
         with:
-          go-version: "1.18.x"
+          go-version: "1.19.x"
       - name: Run repo-specific setup
         uses: ./.github/actions/go-check-setup
         if: hashFiles('./.github/actions/go-check-setup') != ''
@@ -27,7 +27,7 @@ jobs:
             echo "RUNGOGENERATE=true" >> $GITHUB_ENV
           fi
       - name: Install staticcheck
-        run: go install honnef.co/go/tools/cmd/staticcheck@d7e217c1ff411395475b2971c0824e1e7cc1af98 # 2022.1 (v0.3.0)
+        run: go install honnef.co/go/tools/cmd/staticcheck@376210a89477dedbe6fdc4484b233998650d7b3c # 2022.1.3 (v0.3.3)
       - name: Check that go.mod is tidy
         uses: protocol/multiple-go-modules@v1.2
         with:
diff --git a/.github/workflows/go-test.yml b/.github/workflows/go-test.yml
index b86241a..8a1697b 100644
--- a/.github/workflows/go-test.yml
+++ b/.github/workflows/go-test.yml
@@ -10,16 +10,16 @@ jobs:
       fail-fast: false
       matrix:
         os: [ "ubuntu", "windows", "macos" ]
-        go: [ "1.17.x", "1.18.x" ]
+        go: [ "1.18.x", "1.19.x" ]
     env:
       COVERAGES: ""
     runs-on: ${{ format('{0}-latest', matrix.os) }}
     name: ${{ matrix.os }} (go ${{ matrix.go }})
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           submodules: recursive
-      - uses: actions/setup-go@v2
+      - uses: actions/setup-go@v3
         with:
           go-version: ${{ matrix.go }}
       - name: Go information
@@ -43,7 +43,7 @@ jobs:
           # Use -coverpkg=./..., so that we include cross-package coverage.
           # If package ./A imports ./B, and ./A's tests also cover ./B,
           # this means ./B's coverage will be significantly higher than 0%.
-          run: go test -v -coverprofile=module-coverage.txt -coverpkg=./... ./...
+          run: go test -v -shuffle=on -coverprofile=module-coverage.txt -coverpkg=./... ./...
       - name: Run tests (32 bit)
         if: ${{ matrix.os != 'macos' }} # can't run 32 bit tests on OSX.
         uses: protocol/multiple-go-modules@v1.2
@@ -52,7 +52,7 @@ jobs:
         with:
           run: |
             export "PATH=${{ env.PATH_386 }}:$PATH"
-            go test -v ./...
+            go test -v -shuffle=on ./...
       - name: Run tests with race detector
         if: ${{ matrix.os == 'ubuntu' }} # speed things up. Windows and OSX VMs are slow
         uses: protocol/multiple-go-modules@v1.2
@@ -62,7 +62,7 @@ jobs:
         shell: bash
         run: echo "COVERAGES=$(find . -type f -name 'module-coverage.txt' | tr -s '\n' ',' | sed 's/,$//')" >> $GITHUB_ENV
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@f32b3a3741e1053eb607407145bc9619351dc93b # v2.1.0
+        uses: codecov/codecov-action@81cd2dc8148241f03f5839d295e000b8f761e378 # v3.1.0
         with:
           files: '${{ env.COVERAGES }}'
           env_vars: OS=${{ matrix.os }}, GO=${{ matrix.go }}
diff --git a/doc.go b/doc.go
index 9bac2e4..f1fae60 100644
--- a/doc.go
+++ b/doc.go
@@ -12,7 +12,7 @@ means of storing non-sparse array data as required, with a small amount of
 storage and algorithmic overhead required to handle mapping that assumes that
 some elements within any range of data may not be present.
 
-Algorithm Overview
+# Algorithm Overview
 
 The AMT algorithm produces a tree-like graph, with a single root node
 addressing a collection of child nodes which connect downward toward leaf nodes
@@ -144,7 +144,7 @@ bitmap is set, meaning only the left-most is present, which will become the
 new root node (repeated until the new root has more than the first bit set or
 height of 0, the single-node case).
 
-Further Reading
+# Further Reading
 
 See https://github.com/ipld/specs/blob/master/data-structures/hashmap.md for a
 description of a HAMT algorithm. And
@@ -152,7 +152,7 @@ https://github.com/ipld/specs/blob/master/data-structures/vector.md for a
 description of a similar algorithm to an AMT that doesn't support internal node
 compression and therefore doesn't support sparse arrays.
 
-Usage Considerations
+# Usage Considerations
 
 Unlike a HAMT, the AMT algorithm doesn't benefit from randomness introduced by
 a hash algorithm. Therefore an AMT used in cases where user-input can
@@ -182,6 +182,5 @@ There is a direct relationship between the sparseness of index values and the
 number of nodes required to address the entries. This should be the key
 consideration when determining whether an AMT is a suitable data-structure for
 a given application.
-
 */
 package amt
diff --git a/go.mod b/go.mod
index c130000..2e38075 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/filecoin-project/go-amt-ipld/v4
 
-go 1.17
+go 1.18
 
 require (
 	github.com/ipfs/go-block-format v0.0.2
diff --git a/internal/internal.go b/internal/internal.go
index 452b2ee..89615cd 100644
--- a/internal/internal.go
+++ b/internal/internal.go
@@ -61,12 +61,12 @@ type Node struct {
 //
 // The root is serialized in the following form, described as an IPLD Schema:
 //
-// 	type Root struct {
-//    bitWidth Int
-//		height Int
-//		count Int
-//		node Node
-//	} representation tuple
+//		type Root struct {
+//	   bitWidth Int
+//			height Int
+//			count Int
+//			node Node
+//		} representation tuple
 //
 // Where bitWidth, height and count are unsigned integers and Node is the
 // initial root node, see below.