diff --git a/Dockerfile b/Dockerfile
index 061ac9f8..32d27ca7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -9,7 +9,7 @@ ENV PYTHON python3
 
 # Install system dependencies (the overall form of this command is recommended by https://docs.docker.com/engine/userguide/eng-image/dockerfile_best-practices/)
 RUN apt-get update \
-  && apt-get install -y build-essential python3-pip libatlas-dev liblapack-dev libhdf5-dev libmecab-dev mecab-ipadic-utf8 nginx supervisor \
+  && apt-get install -y build-essential python3-pip libatlas-dev liblapack-dev libhdf5-dev libmecab-dev mecab-ipadic-utf8 nginx supervisor wget \
   && rm -rf /var/lib/apt/lists/*
 
 ADD conceptnet5 /src/conceptnet/conceptnet5
diff --git a/Snakefile b/Snakefile
index 5349e058..27e1add8 100644
--- a/Snakefile
+++ b/Snakefile
@@ -76,9 +76,9 @@ CORE_DATASET_NAMES += ["emoji/{}".format(lang) for lang in EMOJI_LANGUAGES]
 
 DATASET_NAMES = CORE_DATASET_NAMES + ["dbpedia/dbpedia_en"]
 
-RAW_DATA_URL = "http://conceptnet.s3.amazonaws.com/raw-data/2016"
+RAW_DATA_URL = "https://conceptnet.s3.amazonaws.com/raw-data/2016"
 PRECOMPUTED_DATA_PATH = "/precomputed-data/2016"
-PRECOMPUTED_DATA_URL = "http://conceptnet.s3.amazonaws.com" + PRECOMPUTED_DATA_PATH
+PRECOMPUTED_DATA_URL = "https://conceptnet.s3.amazonaws.com" + PRECOMPUTED_DATA_PATH
 PRECOMPUTED_S3_UPLOAD = "s3://conceptnet" + PRECOMPUTED_DATA_PATH
 
 INPUT_EMBEDDINGS = [
@@ -119,8 +119,7 @@ rule all:
         DATA + "/stats/language_edges.txt",
         DATA + "/stats/relations.txt",
         DATA + "/assoc/reduced.csv",
-        DATA + "/vectors/mini.h5",
-        "data-loader/sha256sums.txt"
+        DATA + "/vectors/mini.h5"
 
 rule evaluation:
     input:
@@ -158,25 +157,25 @@ rule download_raw:
     output:
         DATA + "/raw/{dirname}/{filename}"
     shell:
-        "wget {RAW_DATA_URL}/{wildcards.dirname}/{wildcards.filename} -O {output}"
+        "wget -nv {RAW_DATA_URL}/{wildcards.dirname}/{wildcards.filename} -O {output}"
 
 rule download_conceptnet_ppmi:
     output:
         DATA + "/precomputed/vectors/conceptnet-55-ppmi.h5"
     shell:
-        "wget {PRECOMPUTED_DATA_URL}/numberbatch/16.09/conceptnet-55-ppmi.h5 -O {output}"
+        "wget -nv {PRECOMPUTED_DATA_URL}/numberbatch/16.09/conceptnet-55-ppmi.h5 -O {output}"
 
 rule download_numberbatch:
     output:
         DATA + "/precomputed/vectors/numberbatch.h5"
     shell:
-        "wget {PRECOMPUTED_DATA_URL}/numberbatch/16.09/numberbatch.h5 -O {output}"
+        "wget -nv {PRECOMPUTED_DATA_URL}/numberbatch/16.09/numberbatch.h5 -O {output}"
 
 rule download_opensubtitles_ppmi:
     output:
         DATA + "/precomputed/vectors/opensubtitles-ppmi-5.h5"
     shell:
-        "wget {PRECOMPUTED_DATA_URL}/numberbatch/17.02/opensubtitles-ppmi-5.h5 -O {output}"
+        "wget -nv {PRECOMPUTED_DATA_URL}/numberbatch/17.02/opensubtitles-ppmi-5.h5 -O {output}"
 
 
 # Precomputation
@@ -649,20 +648,6 @@ rule export_english_text:
         "cn5-vectors export_text -l en {input} {output}"
 
 
-rule sha256sums:
-    input:
-        DATA + "/psql/edge_features.csv.gz",
-        DATA + "/psql/edges.csv.gz",
-        DATA + "/psql/edge_sources.csv.gz",
-        DATA + "/psql/node_prefixes.csv.gz",
-        DATA + "/psql/nodes.csv.gz",
-        DATA + "/psql/relations.csv.gz",
-        DATA + "/psql/sources.csv.gz"
-    output:
-        "data-loader/sha256sums.txt"
-    shell:
-        "sha256sum {input} | sed -e 's:%(data)s:/data/conceptnet:' > {output}" % {'data': DATA}
-
 # Evaluation
 # ==========
 
diff --git a/data-loader/10-check-download.sh b/data-loader/10-download.sh
similarity index 61%
rename from data-loader/10-check-download.sh
rename to data-loader/10-download.sh
index 5cbf227d..9f767bb8 100644
--- a/data-loader/10-check-download.sh
+++ b/data-loader/10-download.sh
@@ -8,17 +8,8 @@ NAMES='edges edge_sources edge_features nodes node_prefixes sources relations'
 
 get_db_files() {
     for name in $NAMES; do
-        curl $PRECOMPUTED_PSQL_URL/$name.csv.gz > $DATA/psql/$name.csv.gz
+        wget -nv -O $DATA/psql/$name.csv.gz $PRECOMPUTED_PSQL_URL/$name.csv.gz
     done
-    sha256sum $DATA/psql/*.csv.gz > $CHECKSUM/sha256sums.computed.txt
-    diff $CHECKSUM/sha256sums.txt $CHECKSUM/sha256sums.computed.txt || panic
-}
-
-panic() {
-    rm $DATA/psql/*.csv.gz
-    echo "SHA-256 hashes of input files don't match. The database will not be built."
-    echo "This could indicate a failed download, a version mismatch, or your HTTP connection getting hijacked."
-    exit 1
 }
 
 mkdir -p $DATA/psql
@@ -27,7 +18,7 @@ mkdir -p $DATA/vectors
 # Get semantic vectors (ConceptNet Numberbatch Mini) that would be
 # computationally expensive to compute
 if [ ! -e $DATA/vectors/mini.h5 ]; then
-    curl $PRECOMPUTED_VECTOR_URL/mini.h5 > $DATA/vectors/mini.h5
+    wget -nv -O $DATA/vectors/mini.h5 $PRECOMPUTED_VECTOR_URL/mini.h5
 fi
 # Get the database input files
 if [ ! -e $DATA/psql/edges.csv.gz ]; then
diff --git a/data-loader/Dockerfile b/data-loader/Dockerfile
index 23340fbc..a7eafa24 100644
--- a/data-loader/Dockerfile
+++ b/data-loader/Dockerfile
@@ -3,13 +3,9 @@ MAINTAINER Rob Speer <rob@luminoso.com>
 
 # Install system dependencies (the overall form of this command is recommended by https://docs.docker.com/engine/userguide/eng-image/dockerfile_best-practices/)
 RUN apt-get update \
-  && apt-get install -y coreutils diffutils curl gzip \
+  && apt-get install -y coreutils diffutils wget gzip \
   && rm -rf /var/lib/apt/lists/*
 
-ADD 10-check-download.sh /docker-entrypoint-initdb.d/10-check-download.sh
+ADD 10-download.sh /docker-entrypoint-initdb.d/10-check-download.sh
 ADD 20-load-db.sql /docker-entrypoint-initdb.d/20-load-db.sql
 ADD 30-done.sh /docker-entrypoint-initdb.d/30-done.sh
-ADD sha256sums.txt /checksum/sha256sums.txt
-
-RUN chown -R root.postgres /data/conceptnet
-RUN chmod -R g+w /data/conceptnet
diff --git a/data-loader/sha256sums.txt b/data-loader/sha256sums.txt
deleted file mode 100644
index 6cf5204f..00000000
--- a/data-loader/sha256sums.txt
+++ /dev/null
@@ -1,7 +0,0 @@
-386450767a6e2bcb8fb33ccfed382b56739c40e017bb0ba0f85e08b669658bc4  /data/conceptnet/psql/edge_features.csv.gz
-8d65673c7bc3dec449c968c96034770ba70cd238bbf94475a29cc47907d882de  /data/conceptnet/psql/edges.csv.gz
-c323a36e4388de9c4530785c75d12161f93f2ada22aefebb3965f52aed3879b1  /data/conceptnet/psql/edge_sources.csv.gz
-8ff28c2be67de8996866f083d9e91f469575b8b67341de3aa57d0f0d25324b5e  /data/conceptnet/psql/node_prefixes.csv.gz
-b96bce7155251ce572b778933728979cf7fc3a5cce949c6e441cea355df10804  /data/conceptnet/psql/nodes.csv.gz
-274c2a19f3c0fd0a0e6f47fa1ecfeaea93c22679c676519f5fc103a3f04a611e  /data/conceptnet/psql/relations.csv.gz
-c9ab7b011478e626cf8ec9ad2a49a8c8583674dcbfc3d9949107a193ad891290  /data/conceptnet/psql/sources.csv.gz
diff --git a/scripts/build.sh b/scripts/build.sh
deleted file mode 120000
index c07a74de..00000000
--- a/scripts/build.sh
+++ /dev/null
@@ -1 +0,0 @@
-build.sh
\ No newline at end of file