diff --git a/.travis.yml b/.travis.yml
index da6344cb6..87b561496 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -109,9 +109,9 @@ before_install:
   # Dependencies are downloaded in $HOME/Downloads and installed in $HOME/Deps
   - mkdir -p $HOME/Downloads $HOME/Deps
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then
-      export PYTHON3="$(type -P python3.5)";
+      export PYTHON3="/usr/bin/python3.5";
     else
-      export PYTHON3="$(type -P python3)";
+      export PYTHON3="/usr/local/bin/python3";
     fi
 
 install:
diff --git a/Pipfile b/Pipfile
index 0dbbf5c6f..e7a6d6acf 100644
--- a/Pipfile
+++ b/Pipfile
@@ -13,7 +13,6 @@ colorama = "*"
 cython = "*"
 docopt = "*"
 numpy = "*"
-pathlib = "*"
 pyyaml = "*"
 sphinx = "*"
 
diff --git a/Pipfile.lock b/Pipfile.lock
index 21b3488b1..419858cdc 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "d3f4a218790537c6fad96ed4f21216482cfb260e0e18d2fe622571a1a7fb5720"
+            "sha256": "620c45be4c55bea470fdc39b72b5e32813431d8bd39e85be8ab5ea1ac0096ebe"
         },
         "host-environment-markers": {
             "implementation_name": "cpython",
@@ -220,12 +220,6 @@
             ],
             "version": "==17.1"
         },
-        "pathlib": {
-            "hashes": [
-                "sha256:6940718dfc3eff4258203ad5021090933e5c04707d5ca8cc9e73c94a7894ea9f"
-            ],
-            "version": "==1.0.1"
-        },
         "pycparser": {
             "hashes": [
                 "sha256:99a8ca03e29851d96616ad0404b4aad7d9ee16f25c9f9708a11faf2810f7b226"
diff --git a/default.nix b/default.nix
index 34484d0fc..8b8382601 100644
--- a/default.nix
+++ b/default.nix
@@ -29,7 +29,6 @@ in
       gdb
       gfortran
       graphviz
-      lcov
       libuuid
       ninja-kitware
       openblas
@@ -41,7 +40,6 @@ in
       python3Packages.cython
       python3Packages.docopt
       python3Packages.numpy
-      python3Packages.pycodestyle
       python3Packages.pyyaml
       python3Packages.sphinx
       rpm
diff --git a/requirements.txt b/requirements.txt
index 9425a58a3..083f631e2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,6 +4,5 @@ colorama
 cython
 docopt
 numpy
-pathlib
 pyyaml
 sphinx