diff --git a/part1/run.w_corpus.sh b/part1/run.w_corpus.sh
index abc3c8d..acb2279 100755
--- a/part1/run.w_corpus.sh
+++ b/part1/run.w_corpus.sh
@@ -1,9 +1,10 @@
 #!/bin/bash
-COMMIT_HASH="d3114168fca525b0539f80e17ab21bc1b99afb6d"
+COMMIT_HASH="153dfb75531c0b73499cef9380357fe0c49a3968"
 
 git clone https://github.com/SekoiaTree/oss-fuzz.git oss-fuzz-w
 cd oss-fuzz-w
 git checkout $COMMIT_HASH
+sed -i 's/BRANCH_TO_CHECKOUT/v1.6.48/g' projects/libpng/Dockerfile
 python3 infra/helper.py build_image --pull libpng
 python3 infra/helper.py build_fuzzers --clean libpng
 
diff --git a/part1/run.w_o_corpus.sh b/part1/run.w_o_corpus.sh
index 77fce87..d20690f 100755
--- a/part1/run.w_o_corpus.sh
+++ b/part1/run.w_o_corpus.sh
@@ -1,9 +1,11 @@
 #!/bin/bash
-COMMIT_HASH="bfed7dce6c66af5ff844ec880333848def837d50"
+COMMIT_HASH="153dfb75531c0b73499cef9380357fe0c49a3968"
 
 git clone https://github.com/SekoiaTree/oss-fuzz.git oss-fuzz-wo
 cd oss-fuzz-wo
 git checkout $COMMIT_HASH
+sed -i 's/BRANCH_TO_CHECKOUT/v1.6.48/g' projects/libpng/Dockerfile
+sed -i 's/#FUZZ_SEED_DISABLE //g' projects/libpng/Dockerfile
 python3 infra/helper.py build_image --pull libpng
 python3 infra/helper.py build_fuzzers --clean libpng
 
diff --git a/part3/improve1/run.improve1.sh b/part3/improve1/run.improve1.sh
new file mode 100755
index 0000000..9952d23
--- /dev/null
+++ b/part3/improve1/run.improve1.sh
@@ -0,0 +1,14 @@
+#!/bin/bash
+COMMIT_HASH="153dfb75531c0b73499cef9380357fe0c49a3968"
+
+git clone https://github.com/SekoiaTree/oss-fuzz.git oss-fuzz-i1
+cd oss-fuzz-i1
+git checkout $COMMIT_HASH
+sed -i 's/BRANCH_TO_CHECKOUT/improve1/g' projects/libpng/Dockerfile
+python3 infra/helper.py build_image --pull libpng
+python3 infra/helper.py build_fuzzers --clean libpng
+
+mkdir -p build/out/corpus
+python3 infra/helper.py run_fuzzer libpng libpng_read_fuzzer --corpus-dir build/out/corpus
+python3 infra/helper.py build_fuzzers --sanitizer coverage libpng
+python3 infra/helper.py coverage libpng --corpus-dir build/out/corpus --fuzz-target libpng_read_fuzzer