diff --git a/cartesi-rollups/node/Dockerfile.test b/cartesi-rollups/node/Dockerfile.test
index c8e22342..9cfee6f5 100644
--- a/cartesi-rollups/node/Dockerfile.test
+++ b/cartesi-rollups/node/Dockerfile.test
@@ -8,7 +8,7 @@ RUN curl https://sh.rustup.rs -sSf | bash -s -- -y
 
 ENV PATH="/root/.cargo/bin:${PATH}"
 
-COPY --from=ethereum/solc:0.8.23 /usr/bin/solc /usr/bin/solc
+COPY --from=ethereum/solc:0.8.27 /usr/bin/solc /usr/bin/solc
 RUN chmod u+x /usr/bin/solc
 
 WORKDIR /app
diff --git a/prt/contracts/foundry.toml b/prt/contracts/foundry.toml
index a7cdd817..1b7a83e9 100644
--- a/prt/contracts/foundry.toml
+++ b/prt/contracts/foundry.toml
@@ -7,6 +7,7 @@ allow_paths = ['../../machine/step/']
 remappings = [
     'step/=../../machine/step/',
 ]
+solc-version = "0.8.27"
 
 [fmt]
 line_length = 80
diff --git a/prt/contracts/src/tournament/abstracts/LeafTournament.sol b/prt/contracts/src/tournament/abstracts/LeafTournament.sol
index 98bff7c1..b873ae51 100644
--- a/prt/contracts/src/tournament/abstracts/LeafTournament.sol
+++ b/prt/contracts/src/tournament/abstracts/LeafTournament.sol
@@ -55,6 +55,11 @@ abstract contract LeafTournament is Tournament {
         );
     }
 
+    error WrongFinalState(
+        uint256 commitment, Machine.Hash expected, Machine.Hash got
+    );
+    error WrongNodesForStep();
+
     function winLeafMatch(
         Match.Id calldata _matchId,
         Tree.Node _leftNode,
@@ -82,21 +87,27 @@ abstract contract LeafTournament is Tournament {
         );
 
         if (_leftNode.join(_rightNode).eq(_matchId.commitmentOne)) {
-            require(_finalState.eq(_finalStateOne), "final state one mismatch");
+            require(
+                _finalState.eq(_finalStateOne),
+                WrongFinalState(1, _finalState, _finalStateOne)
+            );
 
             _clockOne.setPaused();
             pairCommitment(
                 _matchId.commitmentOne, _clockOne, _leftNode, _rightNode
             );
         } else if (_leftNode.join(_rightNode).eq(_matchId.commitmentTwo)) {
-            require(_finalState.eq(_finalStateTwo), "final state two mismatch");
+            require(
+                _finalState.eq(_finalStateTwo),
+                WrongFinalState(2, _finalState, _finalStateTwo)
+            );
 
             _clockTwo.setPaused();
             pairCommitment(
                 _matchId.commitmentTwo, _clockTwo, _leftNode, _rightNode
             );
         } else {
-            revert("wrong nodes for step");
+            revert WrongNodesForStep();
         }
 
         // delete storage
@@ -144,13 +155,12 @@ abstract contract LeafTournament is Tournament {
                 accessLogs = AccessLogs.Context(
                     machineState, Buffer.Context(proofs, 32 + inputLength)
                 );
-                // TODO: contract size too big...
-                // SendCmioResponse.sendCmioResponse(
-                //     accessLogs,
-                //     EmulatorConstants.HTIF_YIELD_REASON_ADVANCE_STATE,
-                //     inputMerkleRoot,
-                //     uint32(inputLength)
-                // );
+                SendCmioResponse.sendCmioResponse(
+                    accessLogs,
+                    EmulatorConstants.HTIF_YIELD_REASON_ADVANCE_STATE,
+                    inputMerkleRoot,
+                    uint32(inputLength)
+                );
                 UArchStep.step(accessLogs);
             } else if ((counter + 1) & uarch_step_mask == 0) {
                 UArchReset.reset(accessLogs);
diff --git a/prt/contracts/src/tournament/abstracts/NonLeafTournament.sol b/prt/contracts/src/tournament/abstracts/NonLeafTournament.sol
index b9d0d759..f5da1581 100644
--- a/prt/contracts/src/tournament/abstracts/NonLeafTournament.sol
+++ b/prt/contracts/src/tournament/abstracts/NonLeafTournament.sol
@@ -93,6 +93,9 @@ abstract contract NonLeafTournament is Tournament {
         emit newInnerTournament(_matchId.hashFromId(), _inner);
     }
 
+    error ChildTournamentNotFinished();
+    error WrongTournamentWinner(Tree.Node commitmentRoot, Tree.Node winner);
+
     function winInnerMatch(
         NonRootTournament _childTournament,
         Tree.Node _leftNode,
@@ -108,11 +111,14 @@ abstract contract NonLeafTournament is Tournament {
 
         (bool finished, Tree.Node _winner, Tree.Node _innerWinner) =
             _childTournament.innerTournamentWinner();
-        require(finished, "child tournament is not finished");
+        require(finished, ChildTournamentNotFinished());
         _winner.requireExist();
 
         Tree.Node _commitmentRoot = _leftNode.join(_rightNode);
-        require(_commitmentRoot.eq(_winner), "tournament winner is different");
+        require(
+            _commitmentRoot.eq(_winner),
+            WrongTournamentWinner(_commitmentRoot, _winner)
+        );
 
         (Clock.State memory _innerClock,) =
             _childTournament.getCommitment(_innerWinner);
diff --git a/prt/contracts/src/tournament/abstracts/Tournament.sol b/prt/contracts/src/tournament/abstracts/Tournament.sol
index 088f8d18..3a514e8b 100644
--- a/prt/contracts/src/tournament/abstracts/Tournament.sol
+++ b/prt/contracts/src/tournament/abstracts/Tournament.sol
@@ -70,14 +70,17 @@ abstract contract Tournament {
     //
     // Modifiers
     //
+    error TournamentIsFinished();
+    error TournamentIsClosed();
+
     modifier tournamentNotFinished() {
-        require(!isFinished(), "tournament is finished");
+        require(!isFinished(), TournamentIsFinished());
 
         _;
     }
 
     modifier tournamentOpen() {
-        require(!isClosed(), "tournament check-in elapsed");
+        require(!isClosed(), TournamentIsClosed());
 
         _;
     }
@@ -166,6 +169,11 @@ abstract contract Tournament {
         clocks[_matchId.commitmentTwo].advanceClock();
     }
 
+    error WrongChildren(
+        uint256 commitment, Tree.Node parent, Tree.Node left, Tree.Node right
+    );
+    error WinByTimeout();
+
     function winMatchByTimeout(
         Match.Id calldata _matchId,
         Tree.Node _leftNode,
@@ -181,7 +189,7 @@ abstract contract Tournament {
         if (_clockOne.hasTimeLeft() && !_clockTwo.hasTimeLeft()) {
             require(
                 _matchId.commitmentOne.verify(_leftNode, _rightNode),
-                "child nodes do not match parent (commitmentOne)"
+                WrongChildren(1, _matchId.commitmentOne, _leftNode, _rightNode)
             );
 
             _clockOne.deduct(_clockTwo.timeSinceTimeout());
@@ -191,7 +199,7 @@ abstract contract Tournament {
         } else if (!_clockOne.hasTimeLeft() && _clockTwo.hasTimeLeft()) {
             require(
                 _matchId.commitmentTwo.verify(_leftNode, _rightNode),
-                "child nodes do not match parent (commitmentTwo)"
+                WrongChildren(2, _matchId.commitmentTwo, _leftNode, _rightNode)
             );
 
             _clockTwo.deduct(_clockOne.timeSinceTimeout());
@@ -199,13 +207,15 @@ abstract contract Tournament {
                 _matchId.commitmentTwo, _clockTwo, _leftNode, _rightNode
             );
         } else {
-            revert("cannot win by timeout");
+            revert WinByTimeout();
         }
 
         // delete storage
         deleteMatch(_matchId.hashFromId());
     }
 
+    error EliminateByTimeout();
+
     function eliminateMatchByTimeout(Match.Id calldata _matchId)
         external
         tournamentNotFinished
@@ -231,7 +241,7 @@ abstract contract Tournament {
             // delete storage
             deleteMatch(_matchId.hashFromId());
         } else {
-            revert("cannot eliminate by timeout");
+            revert EliminateByTimeout();
         }
     }
 
@@ -293,13 +303,15 @@ abstract contract Tournament {
     //
     // Helper functions
     //
+    error InvalidContestedFinalState(Machine.Hash finalState);
+
     function requireValidContestedFinalState(Machine.Hash _finalState)
         internal
         view
     {
         require(
             validContestedFinalState(_finalState),
-            "tournament doesn't have contested final state"
+            InvalidContestedFinalState(_finalState)
         );
     }
 
diff --git a/prt/contracts/test/MultiTournament.t.sol b/prt/contracts/test/MultiTournament.t.sol
index 8c3acdb4..a8056a08 100644
--- a/prt/contracts/test/MultiTournament.t.sol
+++ b/prt/contracts/test/MultiTournament.t.sol
@@ -389,7 +389,7 @@ contract MultiTournamentTest is Util, Test {
         _match = middleTournament.getMatch(_matchId.hashFromId());
         assertTrue(_match.exists(), "match should exist");
 
-        vm.expectRevert("cannot win by timeout");
+        vm.expectRevert(Tournament.WinByTimeout.selector);
         middleTournament.winMatchByTimeout(
             _matchId,
             playerNodes[1][ArbitrationConstants.height(1) - 1],
@@ -457,7 +457,7 @@ contract MultiTournamentTest is Util, Test {
 
         vm.warp(_rootTournamentFinish - 1);
         // cannot eliminate match when both blocks still have time
-        vm.expectRevert("cannot eliminate by timeout");
+        vm.expectRevert(Tournament.EliminateByTimeout.selector);
         topTournament.eliminateMatchByTimeout(_matchId);
 
         vm.warp(_rootTournamentFinish);
diff --git a/prt/tests/compute-rs/Dockerfile b/prt/tests/compute-rs/Dockerfile
index f3a0bd43..cb765f24 100644
--- a/prt/tests/compute-rs/Dockerfile
+++ b/prt/tests/compute-rs/Dockerfile
@@ -29,7 +29,7 @@ WORKDIR /app/prt/tests/compute-rs
 RUN cargo chef cook --release --recipe-path recipe.json
 
 # Build application
-COPY --from=ethereum/solc:0.8.23 /usr/bin/solc /usr/bin/solc
+COPY --from=ethereum/solc:0.8.27 /usr/bin/solc /usr/bin/solc
 RUN chmod u+x /usr/bin/solc
 
 COPY ./prt /app/prt