diff --git a/.github/workflows/ci-test.yml b/.github/workflows/ci-test.yml
index 4429997..641f2b6 100644
--- a/.github/workflows/ci-test.yml
+++ b/.github/workflows/ci-test.yml
@@ -10,19 +10,19 @@ jobs:
       - uses: conda-incubator/setup-miniconda@v2
         with:
           auto-update-conda: true
-          python-version: ${{ matrix.python-version }}
+          python-version: ${{ 3.9 }}
       - name: Conda install clingo
         shell: bash -l {0}
         run: |
-          conda install -c potassco clingo==5.5.2
+          conda install -c potassco clingo==5.6.2
       - name: Conda install clingo-dl
         shell: bash -l {0}
         run: |
-          conda install -c potassco clingo-dl==1.3.0
+          conda install -c potassco clingo-dl==1.4.0
       - name: Conda install clingcon
         shell: bash -l {0}
         run: |
-          conda install -c potassco clingcon==5.0.0
+          conda install -c potassco clingcon==5.2.0
       - name: Build
         run: |
           export CLINGO_LIBRARY_PATH=/usr/share/miniconda/envs/test/lib
@@ -41,19 +41,19 @@ jobs:
       - uses: conda-incubator/setup-miniconda@v2
         with:
           auto-update-conda: true
-          python-version: ${{ matrix.python-version }}
+          python-version: ${{ 3.9 }}
       - name: Conda install clingo
         shell: bash -l {0}
         run: |
-          conda install -c potassco clingo==5.5.2
+          conda install -c potassco clingo==5.6.2
       - name: Conda install clingo-dl
         shell: bash -l {0}
         run: |
-          conda install -c potassco clingo-dl==1.3.0
+          conda install -c potassco clingo-dl==1.4.0
       - name: Conda install clingcon
         shell: bash -l {0}
         run: |
-          conda install -c potassco clingcon==5.0.0
+          conda install -c potassco clingcon==5.2.0
       - name: Build
         run: |
           export CLINGO_LIBRARY_PATH=/usr/local/miniconda/envs/test/lib
diff --git a/Cargo.toml b/Cargo.toml
index 9d6054f..dcd3b25 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,7 +6,7 @@ edition = "2018"
 publish = false
 
 [dependencies]
-clingo = "0.7.0"
+clingo = "=0.8.0"
 clingo-dl-plugin = { git = "https://github.com/potassco/clingo-dl-theory-rs", branch = "master" }
 clingcon-plugin = { git = "https://github.com/potassco/clingcon-theory-rs", branch = "master" }
 rocket = { version = "0.5.0-rc.2", features = ["json"] }
@@ -16,5 +16,3 @@ libloading = "0.7"
 serde = "1.0"
 serde_json = "1.0"
 serde_derive = "1.0"
-
-
diff --git a/src/utils.rs b/src/utils.rs
index 7b98919..812339c 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -1,12 +1,12 @@
 use clingcon_plugin::ConTheory;
 use clingo::{
-    ast, control, ClingoError, Configuration, ConfigurationType, Control, Id, Model, Part,
-    ShowType, SolveHandle, SolveHandleWithEventHandler, SolveMode, SolverLiteral, Statistics,
-    StatisticsType, Symbol, SymbolicAtoms, TruthValue,
+    ast, control, ClingoError, Configuration, ConfigurationType, Control, DefaultCtx,
+    GenericSolveHandle, Id, Model, Part, ShowType, SolveHandle, SolveMode, SolverLiteral,
+    Statistics, StatisticsType, Symbol, SymbolicAtoms, TruthValue,
 };
 use clingo_dl_plugin::DLTheory;
-type DLSolveHandle = SolveHandleWithEventHandler<DLEventHandler>;
-type ConSolveHandle = SolveHandleWithEventHandler<ConEventHandler>;
+type DLSolveHandle = GenericSolveHandle<DefaultCtx, DLEventHandler>;
+type ConSolveHandle = GenericSolveHandle<DefaultCtx, ConEventHandler>;
 use clingo::theory::Theory;
 use rocket::response::{self, Responder};
 use rocket::serde::json::Json;
diff --git a/taskassignment.lp b/taskassignment.lp
index ecc44fb..2315bb5 100644
--- a/taskassignment.lp
+++ b/taskassignment.lp
@@ -14,7 +14,7 @@ seq((T2,ST2),(T1,ST1),Time2) :- assign(T1,ST1,M), assign(T2,ST2,M), T1<T2, execu
 &diff{0-(T,M)} <= 0 :- task(T), machine(M), bound(B).
 &diff{(T,M)-0} <= B :- task(T), machine(M), bound(B).
 
-&show_assignment{}.
+% &show_assignment{}.
 #show.
 
 % instance tai4_4_1.lp