diff --git a/.github/actions/ocaml-shared/action.yml b/.github/actions/ocaml-shared/action.yml
index 5d743fdb8c..298f99bf53 100644
--- a/.github/actions/ocaml-shared/action.yml
+++ b/.github/actions/ocaml-shared/action.yml
@@ -11,3 +11,9 @@ runs:
       uses: ocaml/setup-ocaml@v3
       with:
         ocaml-compiler: ${{ inputs.ocaml_version }}
+
+    - name: Setup OPAM environment
+      run: |
+        # Export all OPAM environment variables to GITHUB_ENV
+        # This avoids other steps to run `eval $(opam env)`
+        opam env | sed -E 's/; export [A-Za-z_][A-Za-z0-9_]*;?//g' >> $GITHUB_ENV
diff --git a/.github/workflows/benches-mina-prover-set-baseline.yml b/.github/workflows/benches-mina-prover-set-baseline.yml
index 3d539fe304..3251076ce1 100644
--- a/.github/workflows/benches-mina-prover-set-baseline.yml
+++ b/.github/workflows/benches-mina-prover-set-baseline.yml
@@ -40,7 +40,6 @@ jobs:
       - name: Run criterion bench
         run: |
           set -x
-          eval $(opam env)
           SAVE_BASELINE_NAME=master-baseline-data bash scripts/bench-criterion-mina-circuits.sh cargo bench -p kimchi --bench proof_criterion
 
       - name: Copy previous baseline to target folder
diff --git a/.github/workflows/benches-mina-prover.yml b/.github/workflows/benches-mina-prover.yml
index b589b30e46..9e7c2fa584 100644
--- a/.github/workflows/benches-mina-prover.yml
+++ b/.github/workflows/benches-mina-prover.yml
@@ -38,7 +38,6 @@ jobs:
 
       - name: Ensure that everything builds
         run: |
-          eval $(opam env)
           cargo check --benches --examples
 
       # 'sleep 1' are necessary because otherwise the outputs are intermixed.
@@ -63,5 +62,4 @@ jobs:
       - name: Run criterion bench
         run: |
           set -x
-          eval $(opam env)
           BASELINE_NAME=master-baseline-data bash scripts/bench-criterion-mina-circuits.sh cargo bench -p kimchi --bench proof_criterion
diff --git a/.github/workflows/benches.yml b/.github/workflows/benches.yml
index af33333dd8..3ee8d3e21f 100644
--- a/.github/workflows/benches.yml
+++ b/.github/workflows/benches.yml
@@ -44,7 +44,6 @@ jobs:
       - name: Run criterion bench
         run: |
           set -x
-          eval $(opam env)
           cargo criterion -p kimchi --bench proof_criterion --color never > criterion_bench 2>&1
           cat criterion_bench
 
diff --git a/.github/workflows/ci-nightly.yml b/.github/workflows/ci-nightly.yml
index 74977872a7..7fdf295be0 100644
--- a/.github/workflows/ci-nightly.yml
+++ b/.github/workflows/ci-nightly.yml
@@ -59,7 +59,6 @@ jobs:
 
       - name: Run all tests with the code coverage
         run: |
-          eval $(opam env)
           make nextest-all-with-coverage
           make test-doc-with-coverage
           make generate-test-coverage-report
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 834d9b3335..692848a7bc 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -136,11 +136,9 @@ jobs:
 
       - name: Doc tests
         run: |
-          eval $(opam env)
           make test-doc
       - name: generate docs
         run: |
-          eval $(opam env)
           make generate-doc
 
       #
@@ -164,7 +162,6 @@ jobs:
           matrix.rust_toolchain_version == needs.define-matrix.outputs.default_rust_version &&
           matrix.os == needs.define-matrix.outputs.default_os
         run: |
-          eval $(opam env)
           RUSTDOCFLAGS="--enable-index-page -Zunstable-options" cargo +nightly doc --all-features --no-deps --workspace --exclude xtask
           cp -r ./target/doc ./book/book/html/rustdoc
 
@@ -209,7 +206,6 @@ jobs:
 
       - name: Lint (clippy)
         run: |
-          eval $(opam env)
           make lint
 
   build:
@@ -242,7 +238,6 @@ jobs:
 
       - name: Ensure that everything builds
         run: |
-          eval $(opam env)
           make
 
   tests:
@@ -283,5 +278,4 @@ jobs:
 
       - name: Run non-heavy tests without the code coverage
         run: |
-          eval $(opam env)
           make nextest
diff --git a/.github/workflows/o1vm-ci.yml b/.github/workflows/o1vm-ci.yml
index 52465d0e7c..85d30069a5 100644
--- a/.github/workflows/o1vm-ci.yml
+++ b/.github/workflows/o1vm-ci.yml
@@ -84,7 +84,6 @@ jobs:
 
       - name: Execute o1vm in E2E flavor using cached data
         run: |
-          eval $(opam env)
           cd o1vm
           unzip -q -o /tmp/o1vm-e2e-testing-cache.zip -d ./
           RUST_LOG=debug RUN_WITH_CACHED_DATA="y" FILENAME="env-for-latest-l2-block.sh" O1VM_FLAVOR="pickles" STOP_AT="=3000000" ./run-code.sh
diff --git a/.github/workflows/test-export-vectors.yml b/.github/workflows/test-export-vectors.yml
index 02d4d1c516..ac8b2854d1 100644
--- a/.github/workflows/test-export-vectors.yml
+++ b/.github/workflows/test-export-vectors.yml
@@ -38,7 +38,6 @@ jobs:
 
       - name: Build export_test_vectors binary
         run: |
-          eval $(opam env)
           cargo build --bin export_test_vectors --all-features
 
       - name: Test export_test_vectors commands
@@ -48,7 +47,6 @@ jobs:
           MODES="legacy kimchi"
           OUTPUT_FORMATS="json es5"
 
-          eval $(opam env)
 
           for format in $FORMATS; do
             for mode in $MODES; do
@@ -132,6 +130,5 @@ jobs:
 
       - name: Run regression tests
         run: |
-          eval $(opam env)
           echo "Running regression tests..."
           cargo test --bin export_test_vectors test_export_regression_all_formats