diff --git a/.github/workflows-source/ci-main.yml b/.github/workflows-source/ci-main.yml
index 1e940b5554c..e45a7a72d90 100644
--- a/.github/workflows-source/ci-main.yml
+++ b/.github/workflows-source/ci-main.yml
@@ -89,7 +89,6 @@ jobs:
       # Only run ci/bazel-scripts/diff.sh on PRs that are not labeled with "CI_ALL_BAZEL_TARGETS".
       OVERRIDE_DIDC_CHECK: ${{ contains(github.event.pull_request.labels.*.name, 'CI_OVERRIDE_DIDC_CHECK') }}
       CI_OVERRIDE_BUF_BREAKING: ${{ contains(github.event.pull_request.labels.*.name, 'CI_OVERRIDE_BUF_BREAKING') }}
-      RUN_ON_DIFF_ONLY: ${{ github.event_name == 'pull_request' && !contains(github.event.pull_request.labels.*.name, 'CI_ALL_BAZEL_TARGETS') }}
     steps:
       - <<: *checkout
       - name: Set BAZEL_EXTRA_ARGS
@@ -109,7 +108,7 @@ jobs:
               nns_tests_nightly
           )
           if [[ "$CI_EVENT_NAME" =~ ^(pull_request|merge_group)$ ]]; then
-              if [[ "$CI_EVENT_NAME" == "merge_group" || "${RUN_ON_DIFF_ONLY:-}" == "true" ]]; then
+              if [[ "$CI_EVENT_NAME" == "merge_group" ]]; then
                   EXCLUDED_TEST_TAGS+=(long_test)
               fi
           elif [[ "$CI_EVENT_NAME" == "push" ]] && [[ "$BRANCH_NAME" =~ ^dev-gh-.* ]]; then
@@ -269,7 +268,6 @@ jobs:
           BAZEL_TARGETS: //...
           MERGE_BASE_SHA: ${{ github.event.pull_request.base.sha }}
           BRANCH_HEAD_SHA: ${{ github.event.pull_request.head.sha }}
-          RUN_ON_DIFF_ONLY: ${{ github.event_name == 'pull_request' && !contains(github.event.pull_request.labels.*.name, 'CI_ALL_BAZEL_TARGETS') }}
       - name: Upload SHA256SUMS (nocache)
         uses: actions/upload-artifact@v4
         with:
diff --git a/.github/workflows/ci-main.yml b/.github/workflows/ci-main.yml
index 909bbd7b43e..c9549930e9a 100644
--- a/.github/workflows/ci-main.yml
+++ b/.github/workflows/ci-main.yml
@@ -44,7 +44,6 @@ jobs:
       # Only run ci/bazel-scripts/diff.sh on PRs that are not labeled with "CI_ALL_BAZEL_TARGETS".
       OVERRIDE_DIDC_CHECK: ${{ contains(github.event.pull_request.labels.*.name, 'CI_OVERRIDE_DIDC_CHECK') }}
       CI_OVERRIDE_BUF_BREAKING: ${{ contains(github.event.pull_request.labels.*.name, 'CI_OVERRIDE_BUF_BREAKING') }}
-      RUN_ON_DIFF_ONLY: ${{ github.event_name == 'pull_request' && !contains(github.event.pull_request.labels.*.name, 'CI_ALL_BAZEL_TARGETS') }}
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -67,7 +66,7 @@ jobs:
               nns_tests_nightly
           )
           if [[ "$CI_EVENT_NAME" =~ ^(pull_request|merge_group)$ ]]; then
-              if [[ "$CI_EVENT_NAME" == "merge_group" || "${RUN_ON_DIFF_ONLY:-}" == "true" ]]; then
+              if [[ "$CI_EVENT_NAME" == "merge_group" ]]; then
                   EXCLUDED_TEST_TAGS+=(long_test)
               fi
           elif [[ "$CI_EVENT_NAME" == "push" ]] && [[ "$BRANCH_NAME" =~ ^dev-gh-.* ]]; then
@@ -304,7 +303,6 @@ jobs:
           BAZEL_TARGETS: //...
           MERGE_BASE_SHA: ${{ github.event.pull_request.base.sha }}
           BRANCH_HEAD_SHA: ${{ github.event.pull_request.head.sha }}
-          RUN_ON_DIFF_ONLY: ${{ github.event_name == 'pull_request' && !contains(github.event.pull_request.labels.*.name, 'CI_ALL_BAZEL_TARGETS') }}
       - name: Upload SHA256SUMS (nocache)
         uses: actions/upload-artifact@v4
         with:
diff --git a/ci/bazel-scripts/diff.sh b/ci/bazel-scripts/diff.sh
deleted file mode 100755
index a6395d07a9d..00000000000
--- a/ci/bazel-scripts/diff.sh
+++ /dev/null
@@ -1,73 +0,0 @@
-#!/usr/bin/env bash
-
-# This script helps us only build bazel targets that have been affected by file
-# changes in the branch merging to target branch.
-#
-# We get the list of files from the diff, query for the ones that are part of any bazel target,
-# and then query for the targets that depend on these files.
-#
-# This scripts is inspired by https://github.com/bazelbuild/bazel/blob/master/scripts/ci/ci.sh
-
-set -euo pipefail
-
-set -x
-cd "$(git rev-parse --show-toplevel)"
-
-MERGE_BASE="${MERGE_BASE_SHA:-HEAD}"
-# we can't use HEAD here because that is the merge commit which contains the changes of the current HEAD of master
-COMMIT_RANGE="$MERGE_BASE..${BRANCH_HEAD_SHA:-}"
-DIFF_FILES=$(git diff --name-only "${COMMIT_RANGE}")
-
-if grep -qE "(.*\.bazel|.*\.bzl|\.bazelrc|\.bazelversion|mainnet-canister-revisions\.json|^\.github)" <<<"$DIFF_FILES"; then
-    echo "Changes detected in bazel files. Considering all targets." >&2
-    echo ${BAZEL_TARGETS:-"//..."}
-    exit 0
-fi
-
-files=()
-for file in $DIFF_FILES; do
-    if f="$(bazel query "$file")"; then
-        files+=("$f")
-    fi
-done
-
-if grep -qE ".*\.sh" <<<"$DIFF_FILES"; then
-    files+=(//pre-commit:shfmt-check)
-fi
-
-if grep -qE ".*\.py" <<<"$DIFF_FILES"; then
-    files+=(//pre-commit:ruff-lint)
-fi
-
-if grep -qE ".*\.hs" <<<"$DIFF_FILES"; then
-    files+=(//pre-commit:ormolu-lint)
-fi
-
-if grep -qE ".*\.proto" <<<"$DIFF_FILES"; then
-    files+=(
-        //pre-commit:protobuf-format-check
-        //pre-commit:buf-breaking
-    )
-fi
-
-if [ ${#files[@]} -eq 0 ]; then
-    echo "Changes not detected in bazel targets. No bazel targets to build or test." >&2
-    exit 0
-fi
-
-if [[ $BAZEL_COMMAND =~ ^build[[:space:]] ]]; then
-    TARGETS=$(bazel query "rdeps(//..., set(${files[*]}))")
-elif [[ $BAZEL_COMMAND =~ ^test[[:space:]] ]]; then
-    EXCLUDED_TAGS=(manual $EXCLUDED_TEST_TAGS)
-    EXCLUDED_TAGS=$(
-        IFS='|'
-        echo "${EXCLUDED_TAGS[*]}"
-    )
-    TARGETS=$(bazel query "kind(test, rdeps(//..., set(${files[*]}))) except attr('tags', '$EXCLUDED_TAGS', //...)")
-else
-    echo "Cannot infer command from BAZEL_COMMAND: ${BAZEL_COMMAND:-}" >&2
-    exit 1
-fi
-
-echo "$TARGETS" | tr '\n' ' ' | sed -e 's/,$//' -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//'
-set +x
diff --git a/ci/bazel-scripts/main.sh b/ci/bazel-scripts/main.sh
index a91a08b2fa1..368fb576d34 100755
--- a/ci/bazel-scripts/main.sh
+++ b/ci/bazel-scripts/main.sh
@@ -23,16 +23,6 @@ done
 # (with versioning)
 if [[ "${IS_PROTECTED_BRANCH:-}" == "true" ]]; then
     release_build="true"
-    RUN_ON_DIFF_ONLY="false"
-fi
-
-if [[ "${CI_EVENT_NAME:-}" == "merge_group" ]]; then
-    RUN_ON_DIFF_ONLY="false"
-fi
-
-if [[ "${RUN_ON_DIFF_ONLY:-}" == "true" ]]; then
-    # get bazel targets that changed within the MR
-    BAZEL_TARGETS=$("${CI_PROJECT_DIR:-}"/ci/bazel-scripts/diff.sh)
 fi
 
 # if bazel targets is empty we don't need to run any tests
diff --git a/ci/scripts/run-build-ic.sh b/ci/scripts/run-build-ic.sh
index 0777b302869..0f85bddfdb5 100755
--- a/ci/scripts/run-build-ic.sh
+++ b/ci/scripts/run-build-ic.sh
@@ -18,35 +18,7 @@ done
 # run build with release on protected branches or if a pull_request is targeting an rc branch
 if [ "${IS_PROTECTED_BRANCH:-}" == "true" ] || [[ "${CI_MERGE_REQUEST_TARGET_BRANCH_NAME:-}" == "rc--"* ]]; then
     ci/container/build-ic.sh -i -c -b
-# check if the job requested running only on diff, otherwise run full build with no release
-elif [[ "${RUN_ON_DIFF_ONLY:-}" == "true" ]]; then
-    TARGETS=$(ci/bazel-scripts/diff.sh)
-    ARGS=(--no-release)
-
-    if [ "$TARGETS" == "//..." ]; then
-        ARGS+=(-i -c -b)
-    else
-        if grep -q "ic-os" <<<"$TARGETS"; then
-            ARGS+=(-i)
-        fi
-        if grep -q "publish/canisters" <<<"$TARGETS"; then
-            ARGS+=(-c)
-        fi
-        if grep -q "publish/binaries" <<<"$TARGETS"; then
-            ARGS+=(-b)
-        fi
-    fi
-
-    if [ ${#ARGS[@]} -eq 1 ]; then
-        if [ "${IS_PROTECTED_BRANCH:-}" == "true" ]; then
-            echo "Error: No changes to build on protected branch. Aborting."
-            exit 1
-        fi
-        echo "No changes that require building IC-OS, binaries or canisters."
-        exit 0
-    fi
-    ci/container/build-ic.sh "${ARGS[@]}"
-# otherwise run full build but with no release
+# otherwise build with no release
 else
     ci/container/build-ic.sh -i -c -b --no-release
 fi