diff --git a/.github/workflows/lint-witness.yaml b/.github/workflows/lint-witness.yaml
index f1ab885..6d1c398 100644
--- a/.github/workflows/lint-witness.yaml
+++ b/.github/workflows/lint-witness.yaml
@@ -8,7 +8,7 @@ on:
 
 jobs:
   lint:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5
diff --git a/.github/workflows/test-linux-default.yaml b/.github/workflows/test-linux-default.yaml
index bac1ac1..fda252a 100644
--- a/.github/workflows/test-linux-default.yaml
+++ b/.github/workflows/test-linux-default.yaml
@@ -15,7 +15,7 @@ jobs:
     strategy:
       matrix:
         go-version: [ 1.18.x ]
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - name: Install Go
         if: success()
@@ -29,4 +29,3 @@ jobs:
         run: cat /proc/cpuinfo
       - name: Run tests
         run: cd tests && go test -v -covermode=count
-
diff --git a/.github/workflows/test-linux-noasm.yaml b/.github/workflows/test-linux-noasm.yaml
index 18c5557..f76c8de 100644
--- a/.github/workflows/test-linux-noasm.yaml
+++ b/.github/workflows/test-linux-noasm.yaml
@@ -15,7 +15,7 @@ jobs:
     strategy:
       matrix:
         go-version: [ 1.18.x ]
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - name: Install Go
         if: success()
diff --git a/.github/workflows/test-witness.yaml b/.github/workflows/test-witness.yaml
index e852910..e565844 100644
--- a/.github/workflows/test-witness.yaml
+++ b/.github/workflows/test-witness.yaml
@@ -14,7 +14,7 @@ jobs:
           - 1.21.13
           - 1.22.7
           - 1.23.1
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     container: golang:${{matrix.containers}}
     steps:
       - uses: actions/checkout@v4
diff --git a/prover/rapidsnark.go b/prover/rapidsnark.go
index e213e60..8edb689 100644
--- a/prover/rapidsnark.go
+++ b/prover/rapidsnark.go
@@ -1,3 +1,5 @@
+//go:build !prover_disabled
+
 package prover
 
 /*
diff --git a/prover/rapidsnark_mock.go b/prover/rapidsnark_mock.go
new file mode 100644
index 0000000..eb32760
--- /dev/null
+++ b/prover/rapidsnark_mock.go
@@ -0,0 +1,19 @@
+//go:build prover_disabled
+
+package prover
+
+import (
+	"errors"
+
+	"github.com/iden3/go-rapidsnark/types"
+)
+
+// Groth16Prover generates proof and returns proof and pubsignals as types.ZKProof
+func Groth16Prover(zkey []byte, witness []byte) (proof *types.ZKProof, err error) {
+	return nil, errors.New("prover disabled: 'prover_disabled' build flag was passed")
+}
+
+// Groth16ProverRaw generates proof and returns proof and pubsignals as json string
+func Groth16ProverRaw(zkey []byte, witness []byte) (proof string, publicInputs string, err error) {
+	return "", "", errors.New("prover disabled: 'prover_disabled' build flag was passed")
+}