diff --git a/.github/workflows/coveralls.yml b/.github/workflows/coveralls.yml
index 25d98c28..a3d37cd3 100644
--- a/.github/workflows/coveralls.yml
+++ b/.github/workflows/coveralls.yml
@@ -5,20 +5,7 @@ on:
 name: Code coverage with llvm-cov
 
 jobs:
-  Prepare:
-    runs-on: ubuntu-latest
-    outputs:
-      pr_changed_source: ${{ steps.classify_pr.outputs.pr_changed_source }}
-    steps:
-      - name: Checkout Crate
-        uses: actions/checkout@v4
-      - name: Determine what files the PR changes.
-        id: classify_pr
-        run: contrib/classify-pr.sh ${{ github.event.pull_request.head.sha }} ${{ github.event.pull_request.base.sha }}
-
   Coveralls:
-    needs: Prepare
-    if: needs.Prepare.outputs.pr_changed_source == 'true'
     name: Code coverage - stable toolchain
     runs-on: ubuntu-latest
     strategy:
diff --git a/.github/workflows/fuzz.yml b/.github/workflows/fuzz.yml
index 232d8812..3a0e4d1a 100644
--- a/.github/workflows/fuzz.yml
+++ b/.github/workflows/fuzz.yml
@@ -9,20 +9,8 @@ on:
   pull_request:
 
 jobs:
-  Prepare:
-    runs-on: ubuntu-latest
-    outputs:
-      pr_changed_source: ${{ steps.classify_pr.outputs.pr_changed_source }}
-    steps:
-      - name: Checkout Crate
-        uses: actions/checkout@v4
-      - name: Determine what files the PR changes.
-        id: classify_pr
-        run: contrib/classify-pr.sh ${{ github.event.pull_request.head.sha }} ${{ github.event.pull_request.base.sha }}
-
   fuzz:
-    needs: Prepare
-    if: ${{ !github.event.act }} && needs.Prepare.outputs.pr_changed_source == 'true'
+    if: ${{ !github.event.act }}
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
@@ -76,8 +64,7 @@ jobs:
           path: executed_${{ matrix.fuzz_target }}
 
   verify-execution:
-    needs: Prepare
-    if: ${{ !github.event.act }} && needs.Prepare.outputs.pr_changed_source == 'true'
+    if: ${{ !github.event.act }}
     needs: fuzz
     runs-on: ubuntu-latest
     steps:
diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 6081d431..169e2e5f 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -14,13 +14,9 @@ jobs:
       crates: ${{ steps.get_matrix.outputs.crates }}
       deps: ${{ steps.get_matrix.outputs.deps }}
       nightly_version: ${{ steps.read_toolchain.outputs.nightly_version }}
-      pr_changed_source: ${{ steps.classify_pr.outputs.pr_changed_source }}
     steps:
       - name: Checkout Crate
         uses: actions/checkout@v4
-      - name: Determine what files the PR changes.
-        id: classify_pr
-        run: contrib/classify-pr.sh ${{ github.event.pull_request.head.sha }} ${{ github.event.pull_request.base.sha }}
       - name: Read nightly version
         id: read_toolchain
         run: echo "nightly_version=$(cat .github/nightly-version)" >> $GITHUB_OUTPUT
@@ -30,7 +26,6 @@ jobs:
 
   Stable:
     needs: Prepare
-    if: needs.Prepare.outputs.pr_changed_source == 'true'
     name: Test - stable toolchain
     runs-on: ubuntu-latest
     strategy:
@@ -52,7 +47,6 @@ jobs:
 
   Beta:
     needs: Prepare
-    if: needs.Prepare.outputs.pr_changed_source == 'true'
     name: Test - beta toolchain
     runs-on: ubuntu-latest
     strategy:
@@ -73,7 +67,6 @@ jobs:
 
   Nightly:
     needs: Prepare
-    if: needs.Prepare.outputs.pr_changed_source == 'true'
     name: Test - nightly toolchain
     runs-on: ubuntu-latest
     strategy:
@@ -98,7 +91,6 @@ jobs:
 
   MSRV:
     needs: Prepare
-    if: needs.Prepare.outputs.pr_changed_source == 'true'
     name: Test - 1.56.1 toolchain
     runs-on: ubuntu-latest
     strategy:
@@ -120,8 +112,6 @@ jobs:
         run: ./contrib/run_task.sh ${{ matrix.crate }} ${{ matrix.task }}
 
   Arch32bit:
-    needs: Prepare
-    if: needs.Prepare.outputs.pr_changed_source == 'true'
     name: Test 32-bit version
     runs-on: ubuntu-latest
     steps:
@@ -139,9 +129,8 @@ jobs:
         run: cargo test --target i686-unknown-linux-gnu
 
   Cross:
-    needs: Prepare
-    if: ${{ !github.event.act }} && needs.Prepare.outputs.pr_changed_source == 'true'
     name: Cross test
+    if: ${{ !github.event.act }}
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Crate
@@ -157,7 +146,6 @@ jobs:
 
   Embedded:
     needs: Prepare
-    if: needs.Prepare.outputs.pr_changed_source == 'true'
     runs-on: ubuntu-latest
     env:
       RUSTFLAGS: "-C link-arg=-Tlink.x"
@@ -183,7 +171,6 @@ jobs:
 
   ASAN:
     needs: Prepare
-    if: needs.Prepare.outputs.pr_changed_source == 'true'
     name: Address sanitizer     # hashes crate only.
     runs-on: ubuntu-latest
     strategy:
@@ -206,7 +193,6 @@ jobs:
 
   WASM:
     needs: Prepare
-    if: needs.Prepare.outputs.pr_changed_source == 'true'
     name: WebAssembly Build # hashes crate only.
     runs-on: ubuntu-latest
     strategy:
@@ -225,7 +211,6 @@ jobs:
 
   Schemars:
     needs: Prepare
-    if: needs.Prepare.outputs.pr_changed_source == 'true'
     name: Schemars
     runs-on: ubuntu-latest
     strategy:
@@ -243,8 +228,6 @@ jobs:
         run: ./contrib/run_task.sh ${{ matrix.crate }} ${{ matrix.task }}
 
   Kani:
-    needs: Prepare
-    if: needs.Prepare.outputs.pr_changed_source == 'true'
     runs-on: ubuntu-20.04
     steps:
       - name: 'Checkout your code.'
diff --git a/contrib/classify-pr.sh b/contrib/classify-pr.sh
deleted file mode 100755
index e72fba5d..00000000
--- a/contrib/classify-pr.sh
+++ /dev/null
@@ -1,29 +0,0 @@
-#!/bin/sh
-
-if [ "$#" -ne 2 ]; then
-  echo "Usage: $0 <tip of master> <tip of PR>"
-  exit 1
-fi
-
-pr_tip=$1
-master_tip=$2
-
-# When called on `pull_request`, GA fails to pull down master by default.
-# When called on `push`, GA fails to pull down the PR by default, only its merge commit.
-# The simplest way to deal with this is to just pull both explicitly.
-git fetch origin "$master_tip":master_tip
-git fetch origin "$pr_tip":pr_tip
-
-pr_base=$(git merge-base master_tip pr_tip)
-
-echo "Using  master $master_tip"
-echo "Using  PR tip $pr_tip"
-echo "Using PR base $pr_base"
-
-# If something modifies any non-markdown file, it's considered a source code change.
-if git diff --name-only "$pr_base" "$pr_tip" | grep -qv "^.md$"; then
-    echo "pr_changed_source=true" >> "$GITHUB_OUTPUT"
-else
-    echo "pr_changed_source=false" >> "$GITHUB_OUTPUT"
-fi
-